Synthesis, structure and photoluminescence of [N-ethyl-4,4'-bipyridinium] [CdBr_4] with N-ethyl-4,4'-bipyridinium generated in situ

摘要

A new viologen(4,4'-bipyridinium)-based complex [N-ethyl-4,4'-bipyridinium] [CdBr_4], in which N-ethyl-4,4'-bipyridinium (EQ~(2+)) has been generated in situ, has been synthesised via hydrothermal reaction and structurally characterised by single-crystal X-ray diffraction. [N-ethyl-4,4'-bipyridinium][CdBr_4] features an isolated structure, based on an N-ethyl-4,4'-bipyridinium moiety and a cadmium atom terminally bound by four bromine atoms. Photoluminescence investigation reveals a broad and intense emission in blue region, which may originated from π → π~* charge-transfer interaction of the N-ethyl-4,4'- bipyridinium moiety.