1-(2-Hydroxyethyl)-5-mercapto-1H-tetrazole as ligand in Cu(I) complexes with or without X-ions (X = Cl, Br, I): synthesis, crystal structures and properties

<p>Four Cu(I) complexes with 1-(2-hydroxyethyl)-5-mercapto-1H-tetrazole (Hhmt) as a ligand, [Cu(hmt)]<sub>n</sub> (<b>1</b>), [Cu<sub>2</sub>Cl(hmt)]<sub>n</sub> (<b>2</b>), [Cu<sub>4</sub>Br(hmt)<sub>3</sub>]<sub>n</sub> (<b>3</b>), and [Cu<sub>4</sub>I(hmt)<sub>3</sub>]<sub>n</sub> (<b>4</b>), have been synthesized. In <b>1</b>–<b>4</b>, hmt adopts a <i>μ</i><sub>4</sub>-<i>η</i><sup>1 </sup>:<sup> </sup> <i>η</i><sup>1 </sup>:<sup> </sup> <i>η</i>S<sup>2</sup> coordinate mode to join the adjacent Cu(I) ions, which form different two-dimensional (2-D) structures. In <b>1</b>, the neighboring four Cu(I) atoms are connected by <i>μ</i><sub>4</sub>-hmt to form a 2-D structure. In <b>2</b>, the Cu(I) ions are firstly connected with Cl ions to form a 1-D [Cu<sub>4</sub>Cl<sub>2</sub>] subunit chain, which then have been bridged by hmt to form a 2-D structure. However, the inorganic [Cu<sub>4</sub>Br] and [Cu<sub>4</sub>I] motifs are respectively connected by hmt to form 2-D structures in isostructural <b>3</b> and <b>4</b>. In addition, the fluorescent properties and the thermal stability properties of <b>1</b>–<b>4</b> have been investigated.</p>