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7 results on '"Mentior, Sophie"'

1. Rapid Cooling Experiments and Use of an Anionic Nuclear Probe to Sense the Spin Transition of the 1D Coordination Polymers [Fe(NH(2)trz)(3)]SnF(6)n H(2)O (NH(2)trz=4-amino-1,2,4-triazole).

Author

UCL - SC/CHIM - Département de chimie, Garcia, Yann, Ksenofontov, Vadim, Mentior, Sophie, Dirtu, Marinela Maria, Gieck, Christine, Bhatthacharjee, Ashis, Gütlich, Philipp, UCL - SC/CHIM - Département de chimie, Garcia, Yann, Ksenofontov, Vadim, Mentior, Sophie, Dirtu, Marinela Maria, Gieck, Christine, Bhatthacharjee, Ashis, and Gütlich, Philipp

Abstract

[Fe(NH(2)trz)(3)]SnF(6)n H(2)O (NH(2)trz=4-amino-1,2,4-triazole; n=1 (1), n=0.5 (2)) are new 1D spin-crossover coordination polymers. Compound 2 exhibits an incomplete spin transition centred at around 210 K with a thermal hysteresis loop approximately 16 K wide. The spin transition of 2 was detected by the Mössbauer resonance of the (119)Sn atom in the SnF(6) (2-) anion primarily on the basis of the evolution of its local distortion. Rapid-cooling (57)Fe Mössbauer and superconducting quantum interference device experiments allow dramatic widening of the hysteresis width of 2 from 16 K up to 82 K and also shift the spin-transition curve into the room temperature region. This unusual behaviour of quenched samples on warming is attributed to activation of the molecular motion of the anions from a frozen distorted form towards a regular form at temperatures well above approximately 210 K. Potential applications of this new family of materials are discussed.

Published
2008

2. 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

3. 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

6. Rapid Cooling Experiments and Use of an Anionic Nuclear Probe to Sense the Spin Transition of the 1D Coordination Polymers [Fe(NH2trz)3]SnF6⋅nH2O (NH2trz=4‐amino‐1,2,4‐triazole)

Author

Garcia, Yann, Ksenofontov, Vadim, Mentior, Sophie, Dîrtu, Marinela M., Gieck, Christine, Bhatthacharjee, Ashis, and Gütlich, Philipp

Abstract

[Fe(NH2trz)3]SnF6⋅nH2O (NH2trz=4‐amino‐1,2,4‐triazole; n=1 (1), n=0.5 (2)) are new 1D spin‐crossover coordination polymers. Compound 2exhibits an incomplete spin transition centred at around 210 K with a thermal hysteresis loop approximately 16 K wide. The spin transition of 2was detected by the Mössbauer resonance of the 119Sn atom in the SnF62−anion primarily on the basis of the evolution of its local distortion. Rapid‐cooling 57Fe Mössbauer and superconducting quantum interference device experiments allow dramatic widening of the hysteresis width of 2from 16 K up to 82 K and also shift the spin‐transition curve into the room temperature region. This unusual behaviour of quenched samples on warming is attributed to activation of the molecular motion of the anions from a frozen distorted form towards a regular form at temperatures well above approximately 210 K. Potential applications of this new family of materials are discussed.

Published
2008
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7. Rapid cooling experiments and use of an anionic nuclear probe to sense the spin transition of the 1D coordination polymers [Fe(NH2trz)3]SnF6n x H2O (NH2trz=4-amino-1,2,4-triazole).

Author

Garcia Y, Ksenofontov V, Mentior S, Dîrtu MM, Gieck C, Bhatthacharjee A, and Gütlich P

Abstract

[Fe(NH2trz)3]SnF6n x H2O (NH(2)trz=4-amino-1,2,4-triazole; n=1 (1), n=0.5 (2)) are new 1D spin-crossover coordination polymers. Compound 2 exhibits an incomplete spin transition centred at around 210 K with a thermal hysteresis loop approximately 16 K wide. The spin transition of 2 was detected by the Mössbauer resonance of the 119Sn atom in the SnF6 (2-) anion primarily on the basis of the evolution of its local distortion. Rapid-cooling 57Fe Mössbauer and superconducting quantum interference device experiments allow dramatic widening of the hysteresis width of 2 from 16 K up to 82 K and also shift the spin-transition curve into the room temperature region. This unusual behaviour of quenched samples on warming is attributed to activation of the molecular motion of the anions from a frozen distorted form towards a regular form at temperatures well above approximately 210 K. Potential applications of this new family of materials are discussed.

Published
2008
Full Text
View/download PDF

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