NDLI: Distinct structures of coordination polymers incorporating flexible triazole -based ligand : topological diversities, crystal structures and property studies

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Yang, Guo-ping Liu, Bin Ren, Chen Wang, Yao-yu Hou, Lei Shi, Qi-zhen
Description	Author Affiliation: Ren C ( Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of the Ministry of Education, College of Chemistry and Materials Science, Northwest University, Xi'an 710069, P.R. China.)
Abstract	Six new coordination polymers , namely $\{[Zn(btec)_{0.5}(btmb)]·2H_{2}O\}_{n}$ (1), $\{[Co(btec)_{0.5}(btmb)(H_{2}O)]·3H_{2}O\}_{n}$ (2), $\{[Cu(btec)_{0.5}(btmb)]·H_{2}O\}_{n}$ (3), $\{[Cu_{4}(btc)_{4}(btmb)_{4}]·H_{2}O\}_{n}$ (4), $\{[Co_{3}(bta)_{2}(btmb)_{2}]·2H_{2}O\}_{n}$ (5), $[Co(Hbta)(btmb)]_{n}$ (6) $(H_{4}btec$ = 1,2,4,5-benzenetetracarboxylate, $H_{3}btc$ = 1,3,5-benzenetricarboxylate, $H_{3}bta$ = 1,2,4-benzenetricarboxylate and btmb = 4,4′-bis(1,2,4-triazol-1-ylmethyl)biphenyl), have been successfully synthesized under hydrothermal conditions. All these complexes were structurally determined by single-crystal X-ray diffraction , elemental analysis , IR , TGA and XRD . Crystal structural analysis reveals that 1 is the first example of an unusual 3D framework with $(8^{6})$ topology containing a 2D molecular fabric structure. Complex 2 exhibits a 3D NbO network with $(6^{4}·8^{2})$ topology. In 3, Cu(II) ions are coordinated by anti-conformational btmb ligands to form left- and right-handed double helices, which are further bridged by the 4-connected $btec^{4−}$ anions to give a 3D porous network. Complex 4 presents a rare 3D gra network structure with $(6^{3})(6^{9}·8)$ topology. 5 and 6 were obtained through controllable pH values of solution, 5 features a scarce binodal (3,8)-connected tfz-d framework with the trinuclear Co(II) clusters acting as nodes, whereas 6 has an extended 2D $4^{4}$ grid-like layer and the adjacent 2D layers are interconnected by strong hydrogen bonding interactions into a 3D supramolecular framework. The structural diversities indicate that distinct organic acid ligands , the nature of metal ions and the pH value play crucial roles in modulating the formation of the resulting coordination complexes and the connectivity of the ultimate topological nets. Moreover, magnetic susceptibility measurement of 5 indicates the presence of weak ferromagnetic interactions between the Co(II) ions bridged by carboxylate groups.
ISSN	14779226
Issue Number	4
Journal	Dalton Trans.
Volume Number	40
e-ISSN	13645447
Language	English
Publisher	Royal Society of Chemistry
Publisher Date	2011-01-28
Publisher Place	Great Britain (UK)
Access Restriction	Subscribed
Subject Keyword	Chemistry
Content Type	Text
Resource Type	Article
Subject	Inorganic Chemistry

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