Crystal structure, Hirshfeld surface, novel XPS spectroscopy and magnetic properties of a hybrid solid with tetrahedral coordination sphere tetrabromocuprate (II)

The synthesis and physico-chemical characterization of an organic-inorganic hybrid material, (N,N'-bi-n-butyl-4,4'-bipyridinium tetrabromocuprate, has been reported. This hybrid has been characterized using IR, thermo-gravimetric and single-crystal X-ray diffraction analyses. In the title salt, (C18H26N2)[CuBr4], the CuBri(4)(2)-ion shows distorted tetrahedral geometry. The tetrabromocuprate and N, N'-bi-n-butyl-4,4'-bipyridiniums are held together via non-classical C-H center dot center dot center dot Br hydrogen bond to form a 3-D hybrid structure. The percentages of hydrogen bonding interactions are analyzed by fingerprint plots of Hirshfeld surface. The XPS spectrum exhibits the signals of coexistence of Cu-I and Cu-II ions. However, the hybrid shows EPR silent behavior at room temperature and variable -temperature magnetic susceptibility displays an isolation of Cull feature with C = 0.46 emu K mol(-1) and theta approximate to - 0.06 K in 2-K as well. Such a novel nature is further analyzed and discussed. (C) 2017 Elsevier B.V. All rights reserved.