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Smirnova KA, Golomolzina IV, Romanenko GV, Fokin SV, Tolstikov SE, Letyagin GA, Chernavin PA, Bogomyakov AS. Solvent-controlled solid-state phase transitions of a heterospin Cu(II) complex with imidazolyl-substituted nitronyl nitroxide. Dalton Trans 2024; 53:13119-13128. [PMID: 39041796 DOI: 10.1039/d4dt01861c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/24/2024]
Abstract
Spontaneous solvent-controlled solid-state transformations were observed for a series of polymeric chain solvates [Cu(hfac)2LPr]·0.5Solv (Solv = (CH3)2CO, THF, CH2Cl2, CH2Br2, CHCl3) with 2-(1-propyl-1H-imidazol-5-yl)-4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazole-3-oxide-1-oxyl (LPr) under ambient conditions. The conversion of powdered polymeric chain [Cu(hfac)2LPr]·0.5THF and [Cu(hfac)2LPr]·0.5(CH3)2CO complexes, accompanied by the loss of solvent molecules, occurs completely to binuclear [Cu(hfac)2LPr]2 within a day. On the other hand, in the case of [Cu(hfac)2LPr]·0.5Solv (Solv = CH2Cl2, CH2Br2, CHCl3), the partial transformation into a desolvated 1D polymer [Cu(hfac)2LPr] or its mixture with [Cu(hfac)2LPr]2 takes much longer time. The magnetic behavior of the isostructural solvates is highly sensitive to the included solvent molecules. The complexes with THF, CH2Cl2, CH2Br2, and CHCl3 undergo a transition to a magnetically ordered state below 4 K, a phenomenon reported for the first time for the polymeric chain Cu(II) complexes with a "head-to-tail" motif. [Cu(hfac)2LPr]·0.5THF and [Cu(hfac)2LPr]·0.5(CH3)2CO undergo a spin transition at 190 K, which is induced by the transformation of the Cu atom environment. In the case of the THF solvate, the increase in the distances between the Cu and oxygen atoms leads to enhanced ferromagnetic exchange interactions, while in the acetone solvate, the nitroxide coordination type changes from axial to equatorial at certain coordination sites, resulting in the emergence of strong antiferromagnetic exchange.
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Affiliation(s)
- Kristina A Smirnova
- International Tomography Center, Siberian Branch, Russian Academy of Sciences, 630090, Institutskaya str., 3a, Novosibirsk, Russia.
| | - Irina V Golomolzina
- International Tomography Center, Siberian Branch, Russian Academy of Sciences, 630090, Institutskaya str., 3a, Novosibirsk, Russia.
| | - Galina V Romanenko
- International Tomography Center, Siberian Branch, Russian Academy of Sciences, 630090, Institutskaya str., 3a, Novosibirsk, Russia.
| | - Sergey V Fokin
- International Tomography Center, Siberian Branch, Russian Academy of Sciences, 630090, Institutskaya str., 3a, Novosibirsk, Russia.
| | - Svyatoslav E Tolstikov
- International Tomography Center, Siberian Branch, Russian Academy of Sciences, 630090, Institutskaya str., 3a, Novosibirsk, Russia.
| | - Gleb A Letyagin
- International Tomography Center, Siberian Branch, Russian Academy of Sciences, 630090, Institutskaya str., 3a, Novosibirsk, Russia.
| | - Platon A Chernavin
- International Tomography Center, Siberian Branch, Russian Academy of Sciences, 630090, Institutskaya str., 3a, Novosibirsk, Russia.
| | - Artem S Bogomyakov
- International Tomography Center, Siberian Branch, Russian Academy of Sciences, 630090, Institutskaya str., 3a, Novosibirsk, Russia.
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Bogomyakov AS, Romanenko GV, Fokin SV, Chubakova ET, Tretyakov EV, Ovcharenko VI. Copper(II) Complexes with CF3-Substituted Spin-Labeled Pyrazoles. RUSS J COORD CHEM+ 2022. [DOI: 10.1134/s1070328422700014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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Tolstikov S, Smirnova K, Kolesnikov A, Letyagin G, Bogomyakov A, Romanenko G, Ovcharenko V. Relationship between phase transition temperature and accessible volume for substituent in Cu(hfac)2 chain-polymer complexes with pyridine-based nitroxides. Polyhedron 2022. [DOI: 10.1016/j.poly.2022.116212] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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