Abstract
As part of continuing studies of multispin compounds capable of exhibiting chemomechanical activity, a series of heterospin solids of the composition [Cu(hfac)2L x L′2−x ], [Cu(hfac)2L′], [Cu2(Piv)4L′2]·0.5C6H14, and [Cu2(hfac)2(Piv)2L′2], where hfac is the hexafluoroacetylacetonate anion, L is 4,4,5,5-tetramethyl-2-(1-methyl-1H-imidazol-5-yl)-4,5-dihydro-1H-imidazole-3-oxide-1-oxyl, L′ is the imino nitroxide analog of L, viz., 4,4,5,5-tetramethyl-2-(1-methyl-1H-imidazol-5-yl)-4,5-dihydro-1H-imidazole-1-oxyl, and Piv is the 2,2-dimethylpropionate anion, were synthesized and characterized. The packing of the synthesized crystals of the solid solutions [Cu(hfac)2L x L′2-x ], where L predominates, is similar to that for [Cu(hfac)2L2], and these crystals are able to undergo chemomechanical motion. On the contrary, the crystals of [Cu(hfac)2L x L′2−x ], where L′ predominates, have structural parameters similar to those of [Cu(hfac)2L′2] and do not exhibit thermally activated or photoactivated chemomechanical activity.
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Dedicated to the memory of the Corresponding Member of the Russian Academy of Sciences M. Yu. Antipin (1951–2013).
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 8, pp. 1803–1808, August, 2013.
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Tretyakov, E.V., Fokin, S.V., Fursova, E.Y. et al. Crystals of the CuII complex with nitronyl nitroxide and imino nitroxide exhibiting mechanical activity. Russ Chem Bull 62, 1803–1808 (2013). https://doi.org/10.1007/s11172-013-0260-5
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DOI: https://doi.org/10.1007/s11172-013-0260-5