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Updated: Jan 15, 2026
Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
Published on: February 7, 2017
Helical Co-based coordination polymer based on asymmetric ligands: synthesis, structure and properties
Zhong Xuan Xu1, Ping Yu Chen2, Gui Xin Cao2
1School of Chemical and Biological Engineering, Hechi University, Hechi 546300, People's Republic of China.
Abstract:
In the presence of 4-[4-(1H-imidazol-1-yl)phenyl]pyridine (ipp), the self-assembly reaction of 2-methoxyterephthalic acid (H2mta) with CoII ions produced the complex poly[[{μ-4-[4-(1H-imidazol-1-yl)phenyl]pyridine}(μ-2-methoxyterephthalato)cobalt(II)] monohydrate], {[Co(C9H6O5)(C14H11N3)]·H2O}n or {[Co(mta)(ipp)]·H2O}n (denoted as HU29). The complex was structurally characterized by thermogravimetric analysis, elemental analysis, IR spectroscopy and single-crystal X-ray diffraction. Single-crystal structure analysis revealed that the mta2- anions and ipp ligands are connected according to AABB and ABAB modes to form four distinct helical chains. These helical chains further construct a three-dimensional (3D) framework. Owing to the similar geometries of mta2- and ipp, combined with the low coordination numbers of the CoII centres, the resulting 3D framework exhibits a fivefold interpenetrating structure. Topological analysis indicates that HU29 can be simplified as a four-connected dia net. UV-Vis absorption spectroscopy shows a broad absorption band in the UV-Vis region and a band gap of 2.72 eV based on the Kubelka-Munk method, indicating semiconductor behaviour. Moreover, a magnetic study reveals that antiferromagnetic interactions occur in HU29 between 300 and 2 K.
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