Effect of Dicarboxylate Ligands on the Construction of Cd(II) Complexes Based on a Flexible Bis-Triazole Ligand

In this work, two dicarboxylate ligands, 4,4′-oxybis(benzoic acid) (H₂oba) and 4,4′-biphenyldicarboxylic acid (H₂bpdc) were employed as coligands to perform a comparison on the structures of Cd(II)-btmx complexes (btmx = 1,4-bis(1,2,4-triazol-1-ylmethyl)-2,3,5,6-tetramethylbenzene) motifs. Two new complexes, {[Cd(btmx)(oba)]·H₂O}_n (1) and [Cd(btmx)(bpdc)]_n (2), have been synthesized and characterized. Structural analyses show that 1 shows a 1D double-chain, while 2 displays an undulating 2D 4⁴-<i>sql</i> network with 2-fold interpenetration. The structural differences of the two complexes suggest that the dicarboxylate ligands have great impact on the formation of such coordination architectures. Furthermore, the photoluminescence properties of 1 and 2 have also been investigated.

本研究选取两种二羧酸配体（dicarboxylate ligands）：4,4'-氧代双苯甲酸（H₂oba）与4,4'-联苯二甲酸（H₂bpdc）作为辅助配体，针对Cd(II)-btmx配合物（btmx = 1,4-双(1,2,4-三唑-1-基甲基)-2,3,5,6-四甲基苯）的结构基元开展对比研究。成功合成并表征了两种新型配合物：{[Cd(btmx)(oba)]·H₂O}ₙ（编号1）与[Cd(btmx)(bpdc)]ₙ（编号2）。结构分析表明，配合物1呈现一维双链结构，而配合物2则展现出具有二重互穿特征的波浪形二维4⁴-sql拓扑网络。两种配合物的结构差异揭示，二羧酸配体对这类配位骨架的形成具有显著影响。此外，本研究还对配合物1和2的光致发光性能进行了系统探究。