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Concerted Spin Crossover and Symmetry Breaking Yield Three Thermally and One Light-Induced Crystallographic Phases of a Molecular Material

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  • This work was supported by Grants in Aid for Scientific Research (No. 16205010) from the Ministry of Education, Science, Sports, and Culture (Japan), Grants in Aid for Creative Scientific Research Program (No. 18GS0208) from the Ministry of Education, Science, Sports, and Culture (Japan), the Institut Universitaire de France, and a Grant “CREATE Ultimate” No. 4146 from Région Bretagne, France. N.B. is grateful to the JSPS for providing a Foreign Postdoctoral Fellowship.

Abstract

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Four crystal phases are accessible by thermally and light-induced spin crossover associated with symmetry breaking for [FeIIH2L2MeH2L2Me](PF6)2 (H2L2Me is an acyclic hexadentate N6 Schiff base). In this novel molecular material, the arrays of FeII complex cations (high-spin: red triangles; low-spin: blue triangles) are separated by layers of counteranions (green zigzag lines).

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