Construction of a 2D Co(II) Coordination Polymer with (4,4)-Connected Topology: Synthesis, Crystal Structure, and Surface Photo-electric Property

Abstract

A 2D grid-like (4, 4)-connected topology coordination polymer, <TEX>$[Co(BTA)_2(H_2O)_2</TEX><TEX>]</TEX><TEX>_n$</TEX> (1), where HBTA = 2-(1H-benzotriazol-1-yl)acetic acid, has been synthesized by hydrothermal method and characterized by single crystal X-ray diffraction, IR spectroscopy, elemental analysis and surface photovoltage spectroscopy (SPS). X-ray diffraction analyses indicated that 1 displays octahedral metal centers with secondary building units (SBUs) [<TEX>$Co(BTA)_2(H_2O)_2$</TEX>] bridged by the <TEX>$BTA^-$</TEX> ligands. In the crystal, the 2D supramolecular architecture is further supported by <TEX>$O-H{\cdots}O$</TEX>, <TEX>$O-H{\cdots}N$</TEX>, <TEX>$C-H{\cdots}O$</TEX> hydrogen bonds and <TEX>${\pi}{\cdots}{\pi}$</TEX> stacking interactions. The SPS of polymer 1 indicates that there are positive response bands in the range of 300-600 nm showing photo-electric conversion properties. There are good relationships between SPS and UV-Vis spectra.