Crystal structure and surface photovoltage of a series of Ni(II) coordination supramolecular polymer

Three Ni(II) coordination supramolecular polymer [Ni(pdc)(H2O)3]n(1), {[Ni(Imh)4(H2O)2] [Ni(btec)(H2O)2 (Imh)2] · H2O}n(2), [Ni(opha)(phen)(H2O)3] · H2O (3) were synthesized by hydrothermal method (H2pdc = pyridine-2,3-dicarboxylic acid, H4btec = 1,2,4,5-benzenetetracarboxylic acid, opha = o-phthalic acid, phen = 1,10-phenanthroline, Imh = Imidazole). Complexes (1) and (2) possess 1D infinite coordination chain structure and the chains are separately further connected to 2D and 3D structure by hydrogen bonds. Complex (3) is a 1D coordination supramolecular compound via the connection of hydrogen bonds. The results of surface photovoltage spectrum (SPS) for complexes (1)–(3) indicate that three complexes exhibit positive surface photovoltage (SPV) response in the range of 300–800 nm, and possess the characteristic of p-type semiconductor.