Syntheses, structures and fluorescence properties of two Zn(II) coordination compounds with <i>cis</i>-4-cyclohexene-1,2-dicarboxylate ligand
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Two Zn(II) coordination compounds, [Zn<sub>2</sub>(<i>L</i>)<sub>2</sub>(bipy)]<sub>n</sub> (<b>1</b>) and [Zn<sub>2</sub>(<i>L</i>)<sub>2</sub>(phen)<sub>2</sub>]<sub>2</sub>·14.75H<sub>2</sub>O (<b>2</b>), (H<sub>2</sub><i>L</i> = <i>cis</i>-4-cyclohexene-1,2-dicarboxylic acid; bipy = 4,4’-bipyridine; phen = 1,10-phenanthroline), were synthesized. The <i>L</i><sup>2–</sup> anions act as tri- and tetradentate ligands to bind to adjacent Zn(II) centers through carboxylate groups in <i>µ</i><sub>1</sub>-<i>η</i><sup>1</sup>:<i>η</i><sup>0</sup>, <i>µ</i><sub>1</sub>-<i>η</i><sup>1</sup>:<i>η</i><sup>1</sup>, <i>µ</i><sub>2</sub>-<i>η</i><sup>1</sup>:<i>η</i><sup>1</sup> and <i>µ</i><sub>2</sub>-<i>η</i><sup>2</sup>:<i>η</i><sup>0</sup> coordination fashions, respectively, forming binuclear units. Compound <b>1</b> has a chain structure composed of these dinuclear units, which is further extended via the bridging bipy molecules to afford a two-dimensional structure. Compound <b>2</b> features two binuclear structural units. The topological analysis of compound <b>1</b> reveals a (3,4,4,5)-connected net with the point symbol of {4<sup>3</sup>‧6<sup>2</sup>‧8}{4<sup>3</sup>}{4<sup>4</sup>‧6<sup>2</sup>}{4<sup>4</sup>‧6<sup>6</sup>}. The fluorescence measurements have shown that compounds <b>1</b> and <b>2</b> present blue and blue-green fluorescence with emission maxima at 406 nm and 480 nm, respectively, which are ascribed to intra-ligand transitions.
