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.
