A series of MM′ heterometallic coordination polymers: Syntheses, structures and surface photoelectric properties (M=Ni/Co, M′=Cd/Zn)

摘要

Four new heterometallic polymers, [NiCd(mal)_2(H _2O)_2]n·2nH_2O 1, [NiZn _2(Hcit)_2(H_2O)_2]n 2, [CoCd _2(Hcit)_2(H_2O)_2]n 3, [CoZn _2(Hcit)_2(H_2O)_2]n 4 (H _2mal=malonic acid, H_4cit=citric acid) were synthesized and characterized. The photoelectric properties of the polymers were discussed by the surface photovoltage spectroscopy (SPS). The structural analyses indicate 1 is a NiCd heterometallic polymer with 3D structure bridged by the mal ~2 group. 24 are all heterometallic polymers with 2D structures bridged by the Hcit~3 group. The results of SPS for the four polymers reveal that there are wide photovoltage response bands in the range of 300800 nm, which indicates that they all possess photoelectric conversion properties. By the introduction of the other metals, the SPS of heterometallic polymers are broadened obviously than the SPS of monometallic complexes. Moreover, the relationships between SPS and UVVis absorption spectra have been discussed.