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Ovcharenko V, Romanenko G, Polushkin A, Letyagin G, Bogomyakov A, Fedin M, Maryunina K, Nishihara S, Inoue K, Petrova M, Morozov V, Zueva E. Pressure-Controlled Migration of Paramagnetic Centers in a Heterospin Crystal. Inorg Chem 2019; 58:9187-9194. [PMID: 31241906 DOI: 10.1021/acs.inorgchem.9b00815] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A study of the single-crystal-to-single-crystal transformation induced by temperature variation for the chain polymer Cu(II) complex with nitronyl nitroxide showed that an increase in the hydrostatic pressure of up to ∼0.07 GPa completely changes the intracrystalline displacements of molecules relative to one another. This, in turn, significantly affects the interaction energy of the unpaired electrons of the paramagnetic centers and hence the form of the temperature dependence of the magnetic susceptibility χT. The cooling of crystals under normal conditions causes a rearrangement of the intrachain exchange clusters {>N-•O-Cu(II)-O•-N<} accompanied by a shortening of the distances between the paramagnetic centers. This changes the character of exchange interactions and generates multistage spin transitions. An increase in the hydrostatic pressure leads to a drastic change in the O···O distances between the nitroxyl fragments of adjacent chains, an increase in the antiferromagnetic exchange between them, and complete suppression of spin transitions.
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Affiliation(s)
- Victor Ovcharenko
- International Tomography Center SB RAS , 3A Institutskaya Street , Novosibirsk 630090 , Russia
| | - Galina Romanenko
- International Tomography Center SB RAS , 3A Institutskaya Street , Novosibirsk 630090 , Russia
| | - Alexey Polushkin
- International Tomography Center SB RAS , 3A Institutskaya Street , Novosibirsk 630090 , Russia
| | - Gleb Letyagin
- International Tomography Center SB RAS , 3A Institutskaya Street , Novosibirsk 630090 , Russia.,Novosibirsk State University , Pirogova Street 1 , Novosibirsk 630090 , Russia
| | - Artem Bogomyakov
- International Tomography Center SB RAS , 3A Institutskaya Street , Novosibirsk 630090 , Russia
| | - Matvey Fedin
- International Tomography Center SB RAS , 3A Institutskaya Street , Novosibirsk 630090 , Russia
| | | | | | | | - Marina Petrova
- International Tomography Center SB RAS , 3A Institutskaya Street , Novosibirsk 630090 , Russia
| | - Vitaly Morozov
- International Tomography Center SB RAS , 3A Institutskaya Street , Novosibirsk 630090 , Russia.,Novosibirsk State University , Pirogova Street 1 , Novosibirsk 630090 , Russia
| | - Ekaterina Zueva
- Department of Inorganic Chemistry , Kazan National Research Technological University , 68 K. Marx Street , Kazan 420015 , Russia.,A. E. Arbuzov Institute of Organic and Physical Chemistry , Kazan Scientific Centre of the Russian Academy of Sciences , Arbuzov Street 8 , Kazan 420008 , Russian.,Kazan Federal University , Kremlyovskaya Street 18 , Kazan 420008 , Russia
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Parois P, Arnold J, Cooper R. An enhanced set of displacement parameter restraints in CRYSTALS. J Appl Crystallogr 2018. [DOI: 10.1107/s1600576718007100] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
Crystallographic restraints are widely used during refinement of small-molecule and macromolecular crystal structures. They can be especially useful for introducing additional observations and information into structure refinements against low-quality or low-resolution data (e.g. data obtained at high pressure) or to retain physically meaningful parameter values in disordered or unstable refinements. However, despite the fact that the anisotropic displacement parameters (ADPs) often constitute more than half of the total model parameters determined in a structure analysis, there are relatively few useful restraints for them, examples being Hirshfeld rigid-bond restraints, direct equivalence of parameters and SHELXL RIGU-type restraints. Conversely, geometric parameters can be subject to a multitude of restraints (e.g. absolute or relative distance, angle, planarity, chiral volume, and geometric similarity). This article presents a series of new ADP restraints implemented in CRYSTALS [Parois, Cooper & Thompson (2015), Chem. Cent. J.
9, 30] to give more control over ADPs by restraining, in a variety of ways, the directions and magnitudes of the principal axes of the ellipsoids in locally defined coordinate systems. The use of these new ADPs results in more realistic models, as well as a better user experience, through restraints that are more efficient and faster to set up. The use of these restraints is recommended to preserve physically meaningful relationships between displacement parameters in a structural model for rigid bodies, rotationally disordered groups and low-completeness data.
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Turunen L, Peuronen A, Forsblom S, Kalenius E, Lahtinen M, Rissanen K. Tetrameric and Dimeric [N⋅⋅⋅I+
⋅⋅⋅N] Halogen-Bonded Supramolecular Cages. Chemistry 2017. [DOI: 10.1002/chem.201702655] [Citation(s) in RCA: 44] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Lotta Turunen
- University of Jyvaskyla; Department of Chemistry; NanoScience Center, P.O. Box 35; 40014 Jyvaskyla Finland
| | - Anssi Peuronen
- University of Jyvaskyla; Department of Chemistry; NanoScience Center, P.O. Box 35; 40014 Jyvaskyla Finland
| | - Samu Forsblom
- University of Jyvaskyla; Department of Chemistry; NanoScience Center, P.O. Box 35; 40014 Jyvaskyla Finland
| | - Elina Kalenius
- University of Jyvaskyla; Department of Chemistry; NanoScience Center, P.O. Box 35; 40014 Jyvaskyla Finland
| | - Manu Lahtinen
- University of Jyvaskyla; Department of Chemistry; NanoScience Center, P.O. Box 35; 40014 Jyvaskyla Finland
| | - Kari Rissanen
- University of Jyvaskyla; Department of Chemistry; NanoScience Center, P.O. Box 35; 40014 Jyvaskyla Finland
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