15 results on '"Sirenko, Valerii Y."'
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2. 2D hybrid organic-inorganic perovskite displaying narrow-band violet-blue photoluminescence
- Author
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Kucheriv, Olesia I., Sirenko, Valerii Y., Shova, Sergiu, and Gural'skiy, Il'ya A.
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- 2024
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Catalog
3. Nature of cyanoargentate bridges defining spin crossover in new 2D Hofmann clathrate analogues.
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Sirenko, Valerii Y., Kucheriv, Olesia I., Shova, Sergiu, Shylin, Sergii I., Ksenofontov, Vadim, Fritsky, Igor O., Tremel, Wolfgang, and Gural'skiy, Il'ya A.
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COORDINATION compounds , *SPIN crossover , *MOSSBAUER effect , *INTERMOLECULAR interactions , *STRUCTURAL frames - Abstract
Chemical composition is leading among the numerous factors that determine the spin transition properties of coordination compounds. Classic dicyanometallic bridges {M(CN)2}− are commonly used to build Hofmann-like spin-crossover frameworks, but some extended bridges are also synthetically available. In this paper, we describe a successful synthesis of two very similar spin-crossover frameworks that differ in the cyanometallic bridges involved, namely [Fe(etpz)2{Ag(CN)2}2] (1) and {Fe(etpz)2[Ag2(CN)3][Ag(CN)2]} (2) (where etpz = 2-ethylpyrazine). Magnetic and Mössbauer studies demonstrated the occurrence of abrupt one-step high-spin (HS) ↔ low-spin (LS) transitions for both complexes. The spin transition temperatures are T1/2 ↓ = 233 K and T1/2 ↑ = 243 K for 1 and T1/2 ↓ = 188 K and T1/2 ↑ = 191 K for 2 with thermal hysteresis loops of 10 K for 1 and 3 K for 2. The bridging mononuclear [Ag(CN)2]− units and FeII cations assemble to form infinite 2D layers in the structure of 1. Interestingly, compound 2 forms 2D layers of FeII cations bridged by both binuclear [Ag2(CN)3]− and mononuclear [Ag(CN)2]− units. The structures of 1 and 2 comprise different types of intermolecular interactions including Ag⋯Ag and Ag⋯Netpz, which induce the creation of supramolecular 3D frameworks. The synergy between metallophilic interactions and the spin transition is also confirmed by the variation of Ag⋯Ag distances during spin crossover. The characterization of such analogues allowed us to analyze in detail the effect of the cyanometallic bridge on the structure of new frameworks and on the bistability in Hofmann-like complexes. [ABSTRACT FROM AUTHOR] more...
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- 2024
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4. Lead-free 3D hybrid perovskites based on an aziridinium cation.
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Kucheriv, Olesia I., Sirenko, Valerii Y., Petrosova, Hanna R., Pavlenko, Vadim A., Shova, Sergiu, and Gural’skiy, Il’ya A.
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- 2023
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5. Crystal structure of bis(3-carboxy-1-methylpyridinium) octabromide.
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Sirenko, Valerii Y., Naumova, Dina D., Golenya, Irina A., Shova, Sergiu, and Gural'skiy, Il'ya A.
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CRYSTAL structure , *SYMMETRY groups , *HYDROGEN bonding , *POINT set theory , *ANIONS - Abstract
The crystal structure of the title salt, bis(3-carboxy-1-methylpyridinium) octabromide, 2C7H8NO2+⋅Br82-, consists of 3-carboxy-1-methylpyridinium (N-methylnicotinic acid) cations, which are stacked between relatively rare [Br8]2- anions. The polybromide [Br8]2- anion has point group symmetry 1 and can be described as being composed of two [Br3]- anions connected with a Br2 molecule in a Z-shaped manner. Contacts between neighboring octabromide anions ensure the creation of pseudo-polymeric chains propagating along [111]. The organic cations are located between anionic chains and are connected to each other through O--H⋯O hydrogen bonds and to the [Br8]2- anions through ⋯Br interactions that induce the creation of a supramolecular triperiodic network. In addition, the presence of weak C--H⋯Br contacts leads to the creation of layers, which align parallel to (112). [ABSTRACT FROM AUTHOR] more...
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- 2023
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6. Carbon dioxide capture from air leading to bis[N-(5-methyl-1H-pyrazol-3-yl-κN²)carbamatoκO] copper(II) tetrahydrate.
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Sirenko, Valerii Y., Kuzevanov, Iryna S., Vynohradov, Oleksandr S., Naumova, Dina D., and Shova, Sergiu
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COPPER , *CARBON sequestration , *CARBON dioxide adsorption , *SURFACE analysis , *INTERMOLECULAR interactions , *ADDITION reactions , *ATMOSPHERIC carbon dioxide - Abstract
A mononuclear square-planar CuII complex of (5-methyl-1H-pyrazol-3-yl) carbamate, [Cu(C5H6N3O2)2]⋅4H2O, was synthesized using a one-pot reaction from 5-methyl-3-pyrazolamine and copper(II) acetate in water under ambient conditions. The adsorption of carbon dioxide from air was facilitated by the addition of diethanolamine to the reaction mixture. While diethanolamine is not a component of the final product, it plays a pivotal role in the reaction by creating an alkaline environment, thereby enabling the adsorption of atmospheric carbon dioxide. The central copper(II) atom is in an (N2O2) squareplanar coordination environment formed by two N atoms and two O atoms of two equivalent (5-methyl-1H-pyrazol-3-yl)carbamate ligands. Additionally, there are co-crystallized water molecules within the crystal structure of this compound. These co-crystallized water molecules are linked to the CuII mononuclear complex by O--H⋯O hydrogen bonds. According to Hirshfeld surface analysis, the most frequently observed weak intermolecular interactions are H⋯O/O⋯H (33.6%), H⋯C/C⋯H (11.3%) and H⋯N/N⋯H (9.0%) contacts. [ABSTRACT FROM AUTHOR] more...
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- 2023
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7. Structural diversity in proline-based lead bromide chiral perovskites.
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Sirenko, Valerii Y., Kucheriv, Olesia I., Fritsky, Igor O., Gumienna-Kontecka, Elzbieta, Dascălu, Ioan-Andrei, Shova, Sergiu, and Gural'skiy, Il'ya A.
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PEROVSKITE , *PROLINE , *HYDROGEN bonding interactions , *AMINO acids , *BAND gaps , *OPTOELECTRONIC devices , *LEAD halides , *INORGANIC compounds - Abstract
Lead halide hybrid perovskites incorporating chiral organic cations attract considerable attention due to their promising application in multifarious optoelectronic devices. However, the examples of chiral hybrid perovskites are still limited, which greatly impedes their further studies in various optoelectronic fields. Herein, we report on new low-dimensional lead-halide hybrid perovskites incorporating the enantiopure chiral α-amino acid L -proline. Two hybrid perovskites (L -proH)PbBr3·H2O (Pro-PbBr3) and (L -proH)4Pb3Br10·4H2O (Pro-Pb3Br10) have been synthesized by employing different ratios of organic and inorganic precursors. According to structural analysis, the inorganic sublattice of compound Pro-PbBr3 is built of one-dimensional (1D) [PbX3]∞n− lead halide chains, whereas the inorganic sublattice of compound Pro-Pb3Br10 is built upon a rare two-dimensional (2D) [Pb3Br10]∞4n− honeycomb-type inorganic framework. Hirshfeld surface analysis revealed an important role of various hydrogen bonding interactions in providing the binding between organic and inorganic parts of these hybrid perovskites. The optical band gap values of new hybrid perovskites as estimated using the Tauc plot approach are 4.19 eV (Pro-PbBr3) and 4.13 eV (Pro-Pb3Br10). Also, new compounds display low-temperature broadband photoluminescence which can be attributed to the self-trapped excitons. These results show the potential of α-proline for constructing novel and highly demanded chiral hybrid perovskites, which will hold great promise for further optoelectronic applications. [ABSTRACT FROM AUTHOR] more...
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- 2023
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8. Chiral 2D organic–inorganic hybrid perovskites based on L-histidine.
- Author
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Sirenko, Valerii Y., Kucheriv, Olesia I., Gumienna-Kontecka, Elzbieta, Shova, Sergiu, and Gural'skiy, Il'ya A.
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PEROVSKITE , *HISTIDINE , *LEAD halides , *THERMAL stability , *CRYSTAL structure , *BROMINE , *PHOTOVOLTAIC power generation - Abstract
Novel chiral hybrid perovskites are highly demanded for various advanced applications such as spintronics, optoelectronics, photovoltaics etc. However, the scope of these new materials is still limited. Herein, we present new 2D hybrid perovskites based upon chiral α-amino acid L -histidine. The generalized formula of these new compounds can be denoted as (L -HisH)2PbBrxI4−x (where L -His = L -histidine; x = 4, 3, 2, 1, 0.4 and 0). All perovskites are characterized by a very similar structural motif that consists of corner-sharing lead halide octahedra arranged in one-layer thin inorganic slabs interleaved by organic layers established by L -histidinium(1+) cations. L -Histidine provides a breaking of spatial parity of these perovskites that results in their non-centrosymmetric crystal structures. These compounds show a multiband absorption up to 590 nm for iodide perovskite. In addition, new compounds display pronounced single-peak photoluminescence, which finely blue shifts upon the gradual substitution of iodine by bromine. New perovskites exhibit excellent thermal stability up to 490 K and 445 K for bromide and iodide compounds, respectively. These results show the ability of L -histidine to produce novel and highly demanded chiral hybrid perovskites. [ABSTRACT FROM AUTHOR] more...
- Published
- 2022
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9. Four‐Step Spin Crossover in a New Cyano‐Bridged Iron‐Silver Coordination Polymer.
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Kucheriv, Olesia I., Shylin, Sergii I., Sirenko, Valerii Y., Ksenofontov, Vadim, Tremel, Wolfgang, Dascălu, Ioan‐Andrei, Shova, Sergiu, and Gural'skiy, Il'ya A.
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SPIN crossover ,COORDINATION polymers ,IRON compounds ,IRON ,DATA warehousing ,CRYSTAL structure - Abstract
Spin‐crossover complexes with multistep transitions attract much attention due to their potential applications as multi‐switches and for data storage. A four‐step spin crossover is observed in the new iron(II)‐based cyanometallic guest‐free framework compound Fe(2‐ethoxypyrazine)2{Ag(CN)2}2 during the transition from the low‐spin to the high‐spin state. A reverse process occurs in three steps. Crystallographic studies reveal an associated stepwise evolution of the crystal structures. Multiple transitions in the reported complex originate from distinct FeII sites which exist due to the packing of the ligand with a bulky substituent. [ABSTRACT FROM AUTHOR] more...
- Published
- 2022
- Full Text
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10. Crystal structure of 9-aminoacridinium chloride N,N-dimethylformamide monosolvate.
- Author
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Fritsky, Igor O., Sirenko, Valerii Y., Shova, Sergiu, Kucheriv, Olesia I., and Gural’skiy, Il’ya A.
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CRYSTAL structure , *SPACE groups , *CHLORIDES , *AMINO group , *CHLORIDE ions , *HYDROGEN bonding , *ATOMS - Abstract
9-Aminoacridinium chloride N,N-dimethylformamide monosolvate, C13H11N2+Cl−·C3H7NO, crystallizes in the monoclinic space group P21/c. The salt was crystallized from N,N-dimethylformamide. The asymmetric unit consists of two C13H11N2+Cl− formula units. The 9-aminoacridinium (9-AA) molecules are protonated with the proton on the N atom of the central ring. This N atom is connected to an N,N-dimethylformamide molecule by a hydrogen bond. The H atoms of the amino groups create short contacts with two chloride ions. The 9-AA cations in adjacent layers are oriented in an antiparallel manner. The molecules are linked via a network of multidirectional π–π interactions between the 9-AA rings, and the whole lattice is additionally stabilized by electrostatic interactions between ions. [ABSTRACT FROM AUTHOR] more...
- Published
- 2021
- Full Text
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11. Chiral organic–inorganic lead halide perovskites based on α-alanine.
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Sirenko, Valerii Y., Kucheriv, Olesia I., Naumova, Dina D., Fesych, Igor V., Linnik, Rostyslav P., Dascălu, Ioan-Andrei, Shova, Sergiu, Fritsky, Igor O., and Gural'skiy, Il'ya A.
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METHYLAMMONIUM , *LEAD halides , *PEROVSKITE , *OPTICAL spectroscopy , *OPTICAL materials , *BAND gaps , *AMINO acids - Abstract
Chiral hybrid organic–inorganic perovskites (HOIPs) attract attention due to their potential for application in optoelectronic, spintronic and photovoltaic devices. However, to this day the range of available chiral HOIPs is still scarce. In this context, we synthesized and thoroughly characterized two pairs of enantiomeric HOIPs incorporating enantiopure α-alanine, the simplest chiral amino acid: (AlaH)PbX3 (Ala = R-alanine or S-alanine, X = Br or I). Single-crystal XRD measurements revealed an unusual 2D anionic motif, which consists of haloplumbate octahedra bonded together in an edge-sharing manner along the c axis and in a corner-sharing manner along the b axis. Four compounds undergo melting/crystallization at unusually low temperatures. New compounds also display photoluminescence in the visible range: 380–640 nm (X = Br) and 480–640 nm (X = I). Electronic spectroscopy reveals an optical response typical for semiconductive materials with optical band gaps of 3.12 eV (X = Br) and 2.48 eV (X = I). These results show that the incorporation of simple and easily accessible α-alanine (and other chiral amino acids) as a cationic part is an efficient way for obtaining highly demanding chiral HOIPs. [ABSTRACT FROM AUTHOR] more...
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- 2021
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12. Direct Synthesis of Spin‐Crossover Complexes: An Unexpectedly Revealed New Iron‐Triazolic Structure.
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Sirenko, Valerii Y., Kucheriv, Olesia I., Rotaru, Aurelian, Fritsky, Igor O., and Gural'skiy, Il'ya A.
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COORDINATION compounds , *DIFFERENTIAL scanning calorimetry , *RIETVELD refinement , *MAGNETIC measurements , *MAGNETIC susceptibility - Abstract
Spin‐crossover complexes form one of the biggest families of switchable compounds. Here we show a new way to obtain spin‐crossover materials by direct synthesis from metallic iron. Four complexes of FeII with 4‐R‐1,2,4‐triazoles have been synthesized by a direct metal oxidation: [Fe(NH2trz)3]SO4, [Fe(NH2trz)3](BF4)2 and two polymorphs of [Fe(Htrz)2(trz)]BF4. Surprisingly high quality of PXRD pattern of [Fe(NH2trz)3]SO4 allowed to perform Rietveld refinement and obtain reliable crystal structure of the latter. All compounds have been studied by magnetic susceptibility measurements, optical reflectivity, differential scanning calorimetry and Raman spectroscopy. Importantly, spin‐crossover characteristics of the complexes obtained by this unusual method are preserved, thus revealing a new effective approach of "direct synthesis" towards switchable coordination compounds. [ABSTRACT FROM AUTHOR] more...
- Published
- 2020
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13. Crystal structure of catena-poly[[[(2-ethoxypyrazine-κN)copper(I)]-di-μ2-cyanido] [copper(I)-μ2-cyanido]].
- Author
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Partsevsk, Sofiia V., Sirenko, Valerii Y., Terebilenko, Kateryna V., Malinkin, Sergey O., and Gural’skiy, Il’ya A.
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CRYSTAL structure , *COORDINATION compounds , *BRIDGING ligands , *GROUP rings , *CYANO group , *COPPER chlorides - Abstract
In the asymmetric unit of the title coordination compound, {[Cu(CN)(C4H3OC2H5N2)][Cu(CN)]}n, there are two Cu atoms with different coordination environments. One CuI ion is coordinated in a triangular coordination geometry by the N atom of the 2-ethoxypyrazine molecule and by two bridging cyanide ligands, equally disordered over two sites exchanging C and N atoms, thus forming polymeric chains parallel to the c axis. The other Cu atom is connected to two bridging cyanide groups disordered over two sites with an occupancy of 0.5 for each C and N atom, and forming an almost linear polymeric chain parallel to the b axis. In the crystal, the two types of chain, which are orthogonal to each other, are connected by cuprophilic Cu∙∙∙Cu interactions [2.7958 (13) Å], forming two-dimensional metal–organic coordination layers parallel to the bc plane. The coordination framework is further stabilized by weak long-range (electrostatic type) C—H∙∙∙π interactions between cyano groups and 2-ethoxypyrazine rings. [ABSTRACT FROM AUTHOR] more...
- Published
- 2019
- Full Text
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14. Four-Step Spin Crossover in a New Cyano-Bridged Iron-Silver Coordination Polymer.
- Author
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Kucheriv OI, Shylin SI, Sirenko VY, Ksenofontov V, Tremel W, Dascălu IA, Shova S, and Gural'skiy IA
- Abstract
Spin-crossover complexes with multistep transitions attract much attention due to their potential applications as multi-switches and for data storage. A four-step spin crossover is observed in the new iron(II)-based cyanometallic guest-free framework compound Fe(2-ethoxypyrazine)
2 {Ag(CN)2 }2 during the transition from the low-spin to the high-spin state. A reverse process occurs in three steps. Crystallographic studies reveal an associated stepwise evolution of the crystal structures. Multiple transitions in the reported complex originate from distinct FeII sites which exist due to the packing of the ligand with a bulky substituent., (© 2022 Wiley-VCH GmbH.) more...- Published
- 2022
- Full Text
- View/download PDF
15. Crystal structure of catena -poly[[[(2-eth-oxy-pyrazine-κ N )copper(I)]-di-μ 2 -cyanido] [copper(I)-μ 2 -cyanido]].
- Author
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Partsevska SV, Sirenko VY, Terebilenko KV, Malinkin SO, and Gural'skiy IA
- Abstract
In the asymmetric unit of the title coordination compound, {[Cu(CN)(C
4 H3 OC2 H5 N2ript> )][Cu(CN)]} n , there are two Cu atoms with different coordination environments. One CuI ion is coordinated in a triangular coordination geometry by the N atom of the 2-eth-oxy-pyrazine mol-ecule and by two bridging cyanide ligands, equally disordered over two sites exchanging C and N atoms, thus forming polymeric chains parallel to the c axis. The other Cu atom is connected to two bridging cyanide groups disordered over two sites with an occupancy of 0.5 for each C and N atom, and forming an almost linear polymeric chain parallel to the b axis. In the crystal, the two types of chain, which are orthogonal to each other, are connected by cuprophilic Cu⋯Cu inter-actions [2.7958 (13) Å], forming two-dimensional metal-organic coordination layers parallel to the bc plane. The coordination framework is further stabilized by weak long-range (electrostatic type) C-H⋯π inter-actions between cyano groups and 2-eth-oxy-pyrazine rings., (© Partsevska et al. 2019.) more...- Published
- 2019
- Full Text
- View/download PDF
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