Ma. Leech et al., A solid-state phase transition at 41 K involving the cooperative ordering of a fluxional pseudo-Jahn-Teller Cu-II system, CHEM COMMUN, (22), 1999, pp. 2245-2246
The complex [Cu{2,6-di(pyrazol-1-yl)pyridine}(2)](BF4)(2) undergoes a solid
-state phase transition at 41 K, involving the cooperative ordering of its
planar dynamic pseudo-Jahn-Teller system; this unique phase transition is c
haracterised by single-crystal X-ray diffraction techniques, employing an o
pen-flow helium cryostat.