Construction of four coordination polymers with helical character based on a flexible bis(triazole) derivative and dicarboxylate coligands

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• 作者：Dongqing Wu ; Wei Meng ; Lin Zhang ; Lu Liu ; Hongwei Hou ; Yaoting Fan
• 关键词：Helical character ; Dicarboxylate anions ; Zn(II) complexes ; Cd(II) complexes ; Luminescence
• 刊名：Inorganica Chimica Acta
• 出版年：2013
• 出版时间：24 August, 2013
• 年：2013
• 卷：405
• 期：Complete
• 页码：318-325
• 全文大小：2187 K

文摘

Based on the flexible bis(triazole) derivative 1,4-bis(1,2,4-triazol-1-ylmethyl)-2,3,5,6-tetramethylbenzene (btmx) and dicarboxylate coligands, four new coordination polymers, namely, [Zn(phsa)(btmx)]_n (1), [Zn(o-phda)(btmx)]_n (2), {[Cd(p-phda)(btmx)(H₂O)]¡¤H₂O}_n (3), and [Cd(4,4¡ä-sdba)(btmx)]_n (4) have been synthesized under hydrothermal conditions. Structural analyses reveal that complexes 1-4 display diverse helical characters under the influence of dicarboxylates with different spacers. Complex 1 exhibits a 3D framework structure with left- and right-handed triple-stranded helices. Complex 2 features an irregular 2D grid constructed from double helices with (4⁴¡¤6²) topology. The point symbol of complex 3 is (6⁸¡¤8²)(6³). Remarkably, it possesses a binodal (3,5)-connected 3D framework with the appearance of left- and right-handed triple-helical chains along the c axis. Moreover, left- and right-handed single-helical chains come into being through alternative arrangement of these triple-helical chains. To the best of our knowledge, coordination polymers containing triple- and single-helical chains along the same crystallographic axis are rare. The structure of complex 4 is a 2D grid comprising double helix components with (4⁴¡¤6²) topology. These results indicate that the spacers of dicarboxylate coligands have significant effects on the helical character and ultimate frameworks. In addition, the investigation of photoluminescence properties reveals that complexes 1-4 show different photoluminescent behaviors.