Construction of four d¹⁰ coordination polymers containing binuclear rings as building blocks from 4′-(2H-tetrazol-5-yl)biphenyl-4-carboxylic acid

<p>Four coordination polymers based on 4′-(2H-tetrazol-5-yl)biphenyl-4-carboxylic acid (H₂TBPC), [Zn(μ₃-TBPC)(H₂O)]_n (<b>1</b>), [Zn(μ₃-TBPC)(Me₂NH)]_n (<b>2</b>), [Cd(μ₃-TBPC)(bpy)]_n (bpy = 4,4′-bipyridine, <b>3</b>), and [Cd(μ₄-TBPC)(H₂O)]_n (<b>4</b>), were constructed under hydrothermal conditions. The compounds are composed of M₂(TBPC)₂ binuclear ring as a building block. In <b>1</b>–<b>3</b>, the binuclear rings are interconnected to three different 2-D networks with the same (4·8²) topology. In <b>4</b>, the binuclear rings are arranged into a 3-D framework with PtS-type topology. The results revealed that the structural diversity is mainly attributed to the coordination geometries of metal ion, the coordination modes of TBPC²⁻, and the auxiliary ligand. The thermal stabilities and luminescent properties of <b>1</b>–<b>4</b> have also been studied.