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Spatially inhomogeneous, stepwise phase transitions in a heterocyclic thiazyl diradical
Rie Suizu(a,c), Akito Iwasaki(b), Yoshiaki Shuku(b) and Kunio Awaga(b,c)
(a) Department of Nanomaterials Science, Chiba University, Japan
(b) Department of Chemistry & Research Center for Materials Science, Nagoya University, Japan
(c) CREST, Nagoya University, JST, Japan
Heterocyclic thiazyl radicals have attracted much attention due to their unique solid-state properties. They are believed to originate from the multi-dimensional crystal structures, formed by pi-pi overlaps and strong electrostatic S-N contacts. In this talk, we report spatially inhomogeneous, stepwise phase transition of a heterocyclic diradical, bis(1,2,3,5-dithiadiazolyl)-4,4’-biphenylene, in which the molecular structure consists of a bulky biphenylene moiety and two terminal 1,2,3,5-dithiadiazolyl radical moieties. The structural and thermodynamic characterizations revealed that the unique structural phase transitions can be attributed to a mismatch between the lattice transformation and the translational symmetry.