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1. Photomagnetism of molecular systems

Author

UCL - SST/IMCN/MOST - Molecules, Solids and Reactivity, Gütlich, P., Garcia, Yann, UCL - SST/IMCN/MOST - Molecules, Solids and Reactivity, Gütlich, P., and Garcia, Yann

Published
2016

2. LIESST effect in Fe(II) 1,2,4-triazole chains

Author

UCL - SST/IMCN/MOST - Molecules, Solids and Reactivity, Garcia, Yann, Renz, F., Gütlich, P., UCL - SST/IMCN/MOST - Molecules, Solids and Reactivity, Garcia, Yann, Renz, F., and Gütlich, P.

Abstract

One-dimensional Fe(II) chains with 1,2,4-triazole as bridging ligands present the LIESST effect; i.e. their spin state switched from low-spin to high-spin after light irradiation at low temperature. This account summarizes the findings in this area of photomagnetism where 57Fe Mössbauer spectroscopy was used as a primary detection tool of the LIESST effect.

Published
2016

3. Spin Crossover Systems

Author

UCL - SST/IMCN/MOST - Molecules, Solids and Reactivity, Gütlich, P., Garcia, Yann, UCL - SST/IMCN/MOST - Molecules, Solids and Reactivity, Gütlich, P., and Garcia, Yann

Published
2015

4. Keynote speaker - Spin crossover complexes - Muon spin relaxation and Mössbauer studies

Author

UCL - SST/IMCN/MOST - Molecules, Solids and Reactivity, Garcia, Yann, Campbell, S.J., Lord, J.S., Gütlich, P., 5th Joint International Conference on Hyperfine Interactions and Symposium on Nuclear Quadrupole Interactions (HFI/NQI 2014), UCL - SST/IMCN/MOST - Molecules, Solids and Reactivity, Garcia, Yann, Campbell, S.J., Lord, J.S., Gütlich, P., and 5th Joint International Conference on Hyperfine Interactions and Symposium on Nuclear Quadrupole Interactions (HFI/NQI 2014)

Published
2014

5. Spin conversion in paramagnetic FeII 1D 1,2,4-triazole chains (poster)

Author

UCL - SST/IMCN/MOST - Molecules, Solids and Reactivity, Garcia, Yann, Lord, J. S., Campbell, S. J., Vendrell Perez, Arnau, Gütlich, P., ICAME 2013 - International Conference on Applications of the Mössbauer Effect, UCL - SST/IMCN/MOST - Molecules, Solids and Reactivity, Garcia, Yann, Lord, J. S., Campbell, S. J., Vendrell Perez, Arnau, Gütlich, P., and ICAME 2013 - International Conference on Applications of the Mössbauer Effect

Published
2013

6. Mössbauer Spectroscopy: Elegance and Versatility in Chemical Diagnostics

Author

UCL - SST/IMCN - Institute of Condensed Matter and Nanosciences, Gütlich, P., Garcia, Yann, UCL - SST/IMCN - Institute of Condensed Matter and Nanosciences, Gütlich, P., and Garcia, Yann

Abstract

Dedicated to Professor Rudolf Ludwig Mössbauer on the occasion of his 80th birthday . Soon after the discovery of the recoilless nuclear resonance fluorescence by Rudolf L. Mössbauer some fifty years ago a new spectroscopic technique developed quickly on the basis of this resonance phenomenon as an excellent tool for the investigation of materials through electric and magnetic hyperfine interactions between electrons and suitable Mo uml ssbauer nu-clides. Many disciplines of solid state research have benefited from applications of the new tool for non-destructive phase analysis. Chemists in particular have recognized the information that can be derived from Mo uml ssbauer spectra regarding oxidation and spin state, molecular symmetry, bonding properties, magnetism, dynamic phenomena such as spin state switching, electronic transfer processes and other phase fluctuations to name a few. This Keynote Lecture presents highlights of chemical applications of Mössbauer spectroscopy selected from work during the past five decades which will demonstrate the elegance and versatility of the technique in the hands of (not only) chemists, but materials scientists in the broadest sense. The retrospect begins with studies in the early sixties on simple oxides and coordination compounds, where Mo uml ssbauer spectroscopy played a decisive role in solving unanswered questions, and concludes with fascinating current discoveries on the Planet Mars and most recent developments in the use of synchrotron radiation for nuclear resonance scattering (NFS, NIS)., Anglais

Published
2010

7. Using 119Sn and 57Fe as nuclear probes to the study of anionic sublattice dynamics in FeII spin transition coordination polymers (poster)

Author

UCL - SC/CHIM - Département de chimie, Garcia, Yann, Dîrtu, M., Gieck, C., Rotaru, A., Linares, J., Ksenofontov, V., Gütlich, P., ICAME'09 - International Conference on Applications of the Mössbauer Effect, UCL - SC/CHIM - Département de chimie, Garcia, Yann, Dîrtu, M., Gieck, C., Rotaru, A., Linares, J., Ksenofontov, V., Gütlich, P., and ICAME'09 - International Conference on Applications of the Mössbauer Effect

Published
2009

8. Dynamics of mononuclear Fe(II) spin crossover complexes - muon studies (poster)

Author

UCL - SC/CHIM - Département de chimie, Garcia, Yann, Campbell, S.J., Lord, J.S., Gütlich, P., MuSR2008 - 11th International Conference on Muon Spin rotation, relaxation and resonance, UCL - SC/CHIM - Département de chimie, Garcia, Yann, Campbell, S.J., Lord, J.S., Gütlich, P., and MuSR2008 - 11th International Conference on Muon Spin rotation, relaxation and resonance

Published
2008

9. Spin conversion of new Fe(II) triple helicate dinuclear complexes (poster)

Author

UCL - SC/CHIM - Département de chimie, De Crom, Nicolas, Tinant, Bernard, Bhattacharjee, A., Gütlich, P., Garcia, Yann, GFSM'2008 - Conference of the French Speaking Group of Mössbauer Spectroscopy, UCL - SC/CHIM - Département de chimie, De Crom, Nicolas, Tinant, Bernard, Bhattacharjee, A., Gütlich, P., Garcia, Yann, and GFSM'2008 - Conference of the French Speaking Group of Mössbauer Spectroscopy

Published
2008

10. Pressure effect studies in molecular magnetism

Author

UCL - SC/CHIM - Département de chimie, Gütlich, P., Gaspar, A.B., Garcia, Yann, Ksenofontov, V., UCL - SC/CHIM - Département de chimie, Gütlich, P., Gaspar, A.B., Garcia, Yann, and Ksenofontov, V.

Abstract

We report on the studies of the influence of hydrostatic pressure (up to 1.2 GPa) on dynamic electronic structure phenomena in 3d transition metal coordination compounds by Mossbauer and magnetic susceptibility measurements. We present examples of mononuclear spin crossover compounds of iron(II) and chromium(H), dinuclear complexes of iron(H) exhibiting coexistence of intramolecular antiferromagnetic coupling and thermal spin crossover, ID, 2D and 3D spin crossover coordination polymers of iron(II), a valence tautomeric system of cobalt(II) showing thermal transition from a high-spin [Co-II(semiquinone)] to a low-spin [Co-III(catecholate)] species on lowering the temperature, a photo-magnetically active Prussian blue-type system with temperature- and pressure-induced electron transfer, and finally an iron-TCNE compound with ferromagnetic interaction.

Published
2007

11. The stepwise spin conversion in a supramolecular triple helicate dinuclear FeII complex revisited (poster)

Author

UCL - SC/CHIM - Département de chimie, Garcia, Yann, Grunert, C.M., Reiman, S., Van Campenhoudt, Olivier, Gütlich, P., ICMM 2006 - 10th International Conference on Molecule-Based Magnets, UCL - SC/CHIM - Département de chimie, Garcia, Yann, Grunert, C.M., Reiman, S., Van Campenhoudt, Olivier, Gütlich, P., and ICMM 2006 - 10th International Conference on Molecule-Based Magnets

Published
2006

12. Muon spin relaxation study on the ID spin transition polymeric chain compound : [Fe(NH2trz)3](NO3)2 (poster)

Author

UCL - SC/CHIM - Département de chimie, Garcia, Yann, Campbell, S.J., Ksenofontov, V., Lord, J.S., Boland, Yves, Gütlich, P., ICMM 2006 - 10th International Conference on Molecule-Based Magnets, UCL - SC/CHIM - Département de chimie, Garcia, Yann, Campbell, S.J., Ksenofontov, V., Lord, J.S., Boland, Yves, Gütlich, P., and ICMM 2006 - 10th International Conference on Molecule-Based Magnets

Published
2006

13. Invited speaker - Spin crossover in novel Fe(II) azole based coordination polymers.

Author

UCL - SC/CHIM - Département de chimie, Garcia, Yann, Ksenofontov, V., Reiman, S., Gieck, C., Gütlich, P., 6th Seeheim Workshop on Mössbauer Spectroscopy, UCL - SC/CHIM - Département de chimie, Garcia, Yann, Ksenofontov, V., Reiman, S., Gieck, C., Gütlich, P., and 6th Seeheim Workshop on Mössbauer Spectroscopy

Published
2006

15. Thermally induced spin conversion of a supramolecular triple helicate dinuclear iron(II) complex revisited by Mössbauer spectroscopy (poster)

Author

UCL - SC/CHIM - Département de chimie, Garcia, Yann, Grunert, C.M., Reiman, S., Van Campenhoudt, Olivier, Gütlich, P., GFSM'2006 - Colloque du Groupe Francophone de Spectroscopie Mössbauer, UCL - SC/CHIM - Département de chimie, Garcia, Yann, Grunert, C.M., Reiman, S., Van Campenhoudt, Olivier, Gütlich, P., and GFSM'2006 - Colloque du Groupe Francophone de Spectroscopie Mössbauer

Published
2006

16. Insight to the origin of the bistability domain of iron(II) polymeric chain compounds

Author

UCL - SC/CHIM - Département de chimie, Garcia, Yann, Dirtu, Marinela, Tinant, Bernard, Reiman, S., Ksenofontov, V., Gütlich, P., International Congress of Pacific Basin Societies (Pacifichem 2005), UCL - SC/CHIM - Département de chimie, Garcia, Yann, Dirtu, Marinela, Tinant, Bernard, Reiman, S., Ksenofontov, V., Gütlich, P., and International Congress of Pacific Basin Societies (Pacifichem 2005)

Published
2005

17. Hysterisis in the spin transition of [Fe(NH2trz)3](NO3)2 as seen by muon spin relaxation (poster)

Author

UCL - SC/CHIM - Département de chimie, Boland, Yves, Garcia, Yann, Campbell, S.J., Ksenofontov, V., Lord, J.S., Gütlich, P., µSR - 10th International Conference on Muon Spin rotation, relaxation and resonance, UCL - SC/CHIM - Département de chimie, Boland, Yves, Garcia, Yann, Campbell, S.J., Ksenofontov, V., Lord, J.S., Gütlich, P., and µSR - 10th International Conference on Muon Spin rotation, relaxation and resonance

Published
2005

18. Muon spin relaxation study of HS Fe(II) 1-D 1,2,4-triazole chain compounds (poster)

Author

UCL - SC/CHIM - Département de chimie, Garcia, Yann, Campbell, S.J., Ksenofontov, V., Lord, J.S., Boland, Yves, Gütlich, P., µSR - 10th International Conference on Muon Spin rotation, relaxation and resonance, UCL - SC/CHIM - Département de chimie, Garcia, Yann, Campbell, S.J., Ksenofontov, V., Lord, J.S., Boland, Yves, Gütlich, P., and µSR - 10th International Conference on Muon Spin rotation, relaxation and resonance

Published
2005

19. Muon spin relaxation studies of model iron(II) spin crossover coordination compounds

Author

UCL - SC/CHIM - Département de chimie, Garcia, Yann, Campbell, S.J., Ksenofontov, V., Lord, J.S., Boland, Yves, Gütlich, P., µSR - 10th International Conference on Muon Spin rotation, relaxation and resonance, UCL - SC/CHIM - Département de chimie, Garcia, Yann, Campbell, S.J., Ksenofontov, V., Lord, J.S., Boland, Yves, Gütlich, P., and µSR - 10th International Conference on Muon Spin rotation, relaxation and resonance

Published
2005

21. Pressure effect studies in molecular magnetism

Author

UCL - SC/CHIM - Département de chimie, Gütlich, P., Gaspar, A.B., Ksenofontov, V., Garcia, Yann, UCL - SC/CHIM - Département de chimie, Gütlich, P., Gaspar, A.B., Ksenofontov, V., and Garcia, Yann

Abstract

We report on temperature dependent magnetic susceptibility and Mössbauer effect studies of the influence of hydrostatic pressure (up to 1.2 GPa) on dynamic electronic structure phenomena in 3d transition metal coordination compounds. The systems under investigation are mononuclear spin crossover compounds of iron (II) and chromium (II), dinuclear complexes of iron (II) exhibiting coexistence of intramolecular antiferromagnetic coupling and thermal spin crossover, 1D, 2D and 3D polynuclear spin crossover complexes of iron (II), a valence tautomeric system of cobalt (II) showing a thermal transition from a high spin [CoII (semiquinone)] to a low spin [CoII (catecholate)] species on lowering the temperature and a photomagnetically active Prussian blue type system with temperature- and pressure induced electron transfer. It is demonstrated that pressure effect studies can be very helpful in elucidating the mechanisms and cooperative interactions of solid state compounds with electronic bistability.

Published
2004

22. Muon spin rotation studies of the spin crossover compound [Fe(phen)2(NCS)2](poster)

Author

UCL - SC/CHIM - Département de chimie, Garcia, Yann, Ksenofontov, V., Campbell, S.J., Lord, J.S., Boland, Yves, Gütlich, P., SCM 2004 - Second Seeheim Conference on Magnetism, UCL - SC/CHIM - Département de chimie, Garcia, Yann, Ksenofontov, V., Campbell, S.J., Lord, J.S., Boland, Yves, Gütlich, P., and SCM 2004 - Second Seeheim Conference on Magnetism

Published
2004

23. Polymorphism and Pressure Driven Thermal Spin Crossover Phenomenon in [Fe(abpt)2(NCX)2] (X = S, and Se): Synthesis, Structure and Magnetic Properties

Author

Universitat Politècnica de València. Departamento de Física Aplicada - Departament de Física Aplicada, European Commission, Deutsche Forschungsgemeinschaft, Ministerio de Ciencia y Tecnología, Gaspar, A. B., Muñoz Roca, María Del Carmen, Moliner, N., Ksenofontov, V., Levchenko, G., Gütlich, P., Real, J. A., Universitat Politècnica de València. Departamento de Física Aplicada - Departament de Física Aplicada, European Commission, Deutsche Forschungsgemeinschaft, Ministerio de Ciencia y Tecnología, Gaspar, A. B., Muñoz Roca, María Del Carmen, Moliner, N., Ksenofontov, V., Levchenko, G., Gütlich, P., and Real, J. A.

Abstract

[EN] The monomeric compounds [Fe(abpt)(2)(NCX)(2)] (X = S (1), Se (2) and abpt = 4-amino-3,5-bis(pyridin-2-yl)-1,2,4-triazole) have been synthesized and characterized. They crystallize in the monoclinic P2(1)/n space group with a = 11.637(2)Angstrom, b = 9.8021(14)Angstrom, c = 12.9838(12)Angstrom, beta=101.126(14)degrees, and Z=2 for 1, and a=11.601(2)Angstrom, b=9.6666(14)Angstrom, c=12.883(2)Angstrom, beta=101.449(10)degrees, and Z= 2 for 2. The unit cell contains a pair mononuclear [Fe(abpt)2(NCX)21 units related by a center of symmetry. Each iron atom, located at a molecular inversion center, is in a distorted octahedral environment. Four of the six nitrogen atoms coordinated to the Fe(H) ion belong to the pyridine-N(l) and triazole-N(2) rings of two abpt ligands. The remaining trans positions are occupied by two nitrogen atoms, N(3), belonging to the two pseudo-halide ligands. The magnetic susceptibility measurements at ambient pressure have revealed that they are in the high-spin range in the 2 K-300 K temperature range. The pressure study has revealed that compound 1 remains in high-spin as pressure is increased up to 4.4kbar, where an incomplete thermal spin crossover appears at around T-1/2 = 65 K. Quenching experiments at 4.4 kbar have shown that the incomplete character of the conversion is a consequence of slow kinetics. Relatively sharp spin transition takes place at T-1/2 = 106, 152 and 179 K, as pressure attains 5.6, 8.6 and 10.5 kbar, respectively.

Published
2003

24. Fluorescence, photoswitching of cation complexation and of intramolecular magnetic interactions from dithienylethenes

Author

UCL - SC/CHIM - Département de chimie, Malval, J.P., Gosse, I., Morand, J.-P., Lapouyade, R., Garcia, Yann, Ksenofontov, V., Gütlich, P., Oberle, J., Jonusauskas, G., Workshop Supramolecular Chemistry and New Materials, UCL - SC/CHIM - Département de chimie, Malval, J.P., Gosse, I., Morand, J.-P., Lapouyade, R., Garcia, Yann, Ksenofontov, V., Gütlich, P., Oberle, J., Jonusauskas, G., and Workshop Supramolecular Chemistry and New Materials

Published
2003

25. A new polymeric chain compound investigated by 57Fe and 119Sn Mössbauer spectroscopy

Author

UCL - SC/CHIM - Département de chimie, Garcia, Yann, Mentior, Sophie, Reiman, S., Ksenofontov, V., Gütlich, P., International Conference on Applications of the Mössbauer Effect, UCL - SC/CHIM - Département de chimie, Garcia, Yann, Mentior, Sophie, Reiman, S., Ksenofontov, V., Gütlich, P., and International Conference on Applications of the Mössbauer Effect

Published
2003

26. Study of the spin transition of a new polymeric chain (poster)

Author

UCL - SC/CHIM - Département de chimie, Garcia, Yann, Mentior, Sophie, Bhattacharjee, A., Reiman, S., Ksenofontov, V., Mahieu, Bernard, Gütlich, P., Colloque du Groupe Francophone de Spectroscopie Mössbauer (GFSM 2003), UCL - SC/CHIM - Département de chimie, Garcia, Yann, Mentior, Sophie, Bhattacharjee, A., Reiman, S., Ksenofontov, V., Mahieu, Bernard, Gütlich, P., and Colloque du Groupe Francophone de Spectroscopie Mössbauer (GFSM 2003)

Published
2003

27. Stoichiometry of LiNiO2 studied by Mössbauer spectroscopy

Author

UCL - SC/CHIM - Département de chimie, Ksenofontov, V., Reiman, S., Walcher, D., Garcia, Yann, Doroshenko, N., Gütlich, P., UCL - SC/CHIM - Département de chimie, Ksenofontov, V., Reiman, S., Walcher, D., Garcia, Yann, Doroshenko, N., and Gütlich, P.

Abstract

From the 61Ni and 57Fe Mössbauer spectroscopy data follows the cationic site assignment in Li1–x Ni1+x O2. Our data explain the ferromagnetic properties of this material because of the appearance of Ni2+ (S=1) among Ni3+ (S=1/2) in Ni3+O2 hexagonal planes. We have no evidence for the ferromagnetic interaction between the NiO2 layers through the excess Ni2+ ions substituting the Li+ ions. The presence of Ni2+ found in the Ni3+O2 planes explains the absence of the Jahn–Teller distortions probably because of the electronic transfer between the Ni3+ and Ni2+ ions.

Published
2002

28. A spin transition molecular material with a wide bistability domain

Author

UCL - SC/CHIM - Département de chimie, Garcia, Yann, Moscovici, J., Michalowicz, A., Ksenofontov, V., Levchenko, G., Bravic, G., Chasseau, D., Gütlich, P., UCL - SC/CHIM - Département de chimie, Garcia, Yann, Moscovici, J., Michalowicz, A., Ksenofontov, V., Levchenko, G., Bravic, G., Chasseau, D., and Gütlich, P.

Abstract

[Fe(hyptrz)3](4-chloro-3-nitrophenylsulfonate)2⋅2 H2O (1; hyptrz=4-(3′-hydroxypropyl)-1,2,4-triazole) has been synthesized and its physical properties have been investigated by several physical techniques including magnetic susceptibility measurements, calorimetry, and Mössbauer, optical, and EXAFS spectroscopy. Compound 1 exhibits a spin transition below room temperature, together with a very wide thermal hysteresis of about 50 K. This represents the widest hysteresis loop ever observed for an FeII-1,2,4-triazole spin transition material. The cooperativity is discussed on the basis of temperature-dependent EXAFS studies and of the structural features of a CuII analogue. The EXAFS structural model of (1) in both spin states is compared to that obtained for a related material whose spin transition occurs above room temperature. EXAFS spectroscopy suggests that 1,2,4-triazole chain compounds retain a linear character whatever the spin state of the iron(II).

Published
2002

30. Spin transition molecular materials : new sensors

Author

UCL - SC/CHIM - Département de chimie, Garcia, Yann, Ksenofontov, V., Gütlich, P., UCL - SC/CHIM - Département de chimie, Garcia, Yann, Ksenofontov, V., and Gütlich, P.

Abstract

This short review article concerns a new family of iron(II) spin transition chain compounds containing 4-R-1,2,4-triazole derivatives whose properties have been followed by several physical techniques. A clear evidence of the LIESST effect at 20 K has been found for one of these materials by 57Fe Mössbauer spectroscopy. Potential applications in terms of pressure and thermal sensors are discussed.

Published
2002

31. Mononuclear coordination compounds based on a novel chelating triazole ligand : 1-vinyl-3-acetylamino-1,2,4-triazole

Author

UCL - SC/CHIM - Département de chimie, Bushuev, M.B., Virovets, A.V., Garcia, Yann, Gieck, C., Sheludyakova, L.A., Ikorskii, V.N., Tremel, W., Gütlich, P., Lavrenova, L.G., UCL - SC/CHIM - Département de chimie, Bushuev, M.B., Virovets, A.V., Garcia, Yann, Gieck, C., Sheludyakova, L.A., Ikorskii, V.N., Tremel, W., Gütlich, P., and Lavrenova, L.G.

Abstract

The synthesis, X-ray structure, magnetic and spectroscopic properties of new Co(II), Ni(II) and Cu(II) complexes with 1-vinyl-3-acetylamino-1,2,4-triazole (vaat) are reported. The crystal structures of [Ni(vaat)2(H2O)2](NO3)2 and [Cu(vaat)2(H2O)2]Cl2 have been determined by X-ray diffraction. In these mononuclear complexes, the metal ion is surrounded by two water molecules in axial positions and two oxygen and two nitrogen (N4) atoms coming from two trans-oriented chelating vaat molecules. Anions are noncoordinated and are involved in a hydrogen bonding network. The complex cations of [Cu(vaat)2(H2O)2]Cl2 are aligned within chains. In the structure of [Ni(vaat)2(H2O)2](NO3)2 the nitrate anions establish a bridge in the plane by hydrogen bonding giving a 2-D character for this compound. In addition, a colour change from pink to blue upon heating has been observed for [Co(vaat)2(H2O)2]Cl2, which is due to the removal of the two coordinated water molecules and the subsequent molecular reorganisation of the molecular structure. The synthesis, structure, magnetic and spectroscopic properties of new Co(II), Ni(II) and Cu(II) complexes with 1-vinyl-3-acetylamino-1,2,4-triazole (vaat) are reported. The crystal structures of [Ni(vaat)2(H2O)2](NO3)2 and [Cu(vaat)2(H2O)2]Cl2 have been determined by X-ray diffraction.

Published
2002

32. muSR and Mössbauer study of a spin crossover compound (poster)

Author

UCL - SC/CHIM - Département de chimie, Campbell, S. J., Ksenofontov, V., Garcia, Yann, Lord, J. S., Reiman, S., Gütlich, P., 5th Seeheim Workshop on Mössbauer Spectroscopy, UCL - SC/CHIM - Département de chimie, Campbell, S. J., Ksenofontov, V., Garcia, Yann, Lord, J. S., Reiman, S., Gütlich, P., and 5th Seeheim Workshop on Mössbauer Spectroscopy

Published
2002

33. New FeII complexes with precursors of photochromic molecules (poster)

Author

UCL - SC/CHIM - Département de chimie, Garcia, Yann, Ksenofontov, V., Reiman, S., Tremel, W., Lapouyade, R., Gütlich, P., 5th Seeheim Workshop on Mössbauer Spectroscopy, UCL - SC/CHIM - Département de chimie, Garcia, Yann, Ksenofontov, V., Reiman, S., Tremel, W., Lapouyade, R., Gütlich, P., and 5th Seeheim Workshop on Mössbauer Spectroscopy

Published
2002

34. Polarized neutron diffraction and Mössbauer spectral study of short-range magnetic correlations in the ferrimagnetic layered compounds (PPh4) [FeIIFeIII(ox)3] and (NBu4) [FeIIFeIII(ox)3]

Author

Carling, S.G. (author), Visser, D. (author), Hautot, D. (author), Watts, I.D. (author), Day, P. (author), Ensling, J. (author), Gütlich, P. (author), Long, G.J. (author), Grandjean, F. (author), Carling, S.G. (author), Visser, D. (author), Hautot, D. (author), Watts, I.D. (author), Day, P. (author), Ensling, J. (author), Gütlich, P. (author), Long, G.J. (author), and Grandjean, F. (author)

Published
2002

35. Polarized neutron diffraction and Mössbauer spectral study of short-range magnetic correlations in the ferrimagnetic layered compounds (PPh4) [FeIIFeIII(ox)3] and (NBu4) [FeIIFeIII(ox)3]

Author

Carling, S.G. (author), Visser, D. (author), Hautot, D. (author), Watts, I.D. (author), Day, P. (author), Ensling, J. (author), Gütlich, P. (author), Long, G.J. (author), Grandjean, F. (author), Carling, S.G. (author), Visser, D. (author), Hautot, D. (author), Watts, I.D. (author), Day, P. (author), Ensling, J. (author), Gütlich, P. (author), Long, G.J. (author), and Grandjean, F. (author)

Published
2002

36. Photo-magnetism of transition metal compounds

Author

University of Mainz (Germany) - Inorganic and Analytical Chemistry, Gütlich, P., Garcia, Yann, van Koningsbruggen, P. J., Renz, F., University of Mainz (Germany) - Inorganic and Analytical Chemistry, Gütlich, P., Garcia, Yann, van Koningsbruggen, P. J., and Renz, F.

Published
2001

37. Direct monitoring of spin state in dinuclear iron(II) coordination compounds

Author

University of Mainz (Germany) - Inorganic and Analytical Chemistry, Ksenofontov, V., Spiering, H., Reiman, S., Garcia, Yann, Gaspar, A.B., Moliner, N., Real, J.A., Gütlich, P., University of Mainz (Germany) - Inorganic and Analytical Chemistry, Ksenofontov, V., Spiering, H., Reiman, S., Garcia, Yann, Gaspar, A.B., Moliner, N., Real, J.A., and Gütlich, P.

Abstract

So far there has been no direct method to determine the spin state of molecules in dinuclear iron(II) compounds. The molecular fractions of high-spin (HS) and low-spin (LS) species have been deduced from magnetic susceptibility and zero-field Mössbauer spectroscopy data irrespective of whether they belong to LS–LS, LS–HS and HS–HS pairs. However, the distinction of pairs becomes possible if Mössbauer measurements are carried out in an external magnetic field. The proposed method opens new possibilities in the study of spin crossover phenomena in dinuclear compounds.

Published
2001

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