The structures and properties of zinc(II) and cadmium(II) coordination polymers based on semi-rigid phenylenediacetate and 1,4-bis(2-methylimidazol-1-ylmethyl)benzene linkers
Abstract
A systematic investigation into the reactions of o- and p-phenylenediacetic acid with zinc(II) and cadmium(II) salts in the presence of the semi-rigid 1,4-bis(2-methylimidazol-1-ylmethyl)benzene (pbmeix) co-ligand is reported. Five new coordination polymers - [Zn(μ-opda)(μ-pbmeix)0.5]n1, {[Zn(μ-ppda)(μ-pbmeix)]·H2O}n2, {[Zn(μ-ppda)(μ-pbmeix)]•0.5pbmeix·H2O}n3, {[Cd(μ-opda)(μ-pbmeix)]·0.5DMF}n4 and [Cd(μ-ppda)(μ-pbmeix)0.5]n5 (o/ppda = 1,2-/1,4-phenylenediacetate) - have been prepared and structurally characterised. Compounds 1 and 5 were found to form three-dimensional coordination networks, 2 forms a two-dimensional structure whereas both 3 and 4 form one-dimensional nanotubular structures. Compounds 1 and 4 are opda complexes in which the dicarboxylate shows a tridentate coordination mode in 1 and a tetradentate coordination mode in 4. Compounds 2, 3 and 5 are ppda complexes in which the dicarboxylate adopts bidentate (2, 3) and hexadentate (5) coordination modes. The structure of 2 contains interpenetrated 2D frameworks and is a polycatenane with ppda linkers from one framework passing through Zn2(μ-pbmeix)2 rings from a neighbouring framework. The thermal stability of complexes 1-4 and luminescence properties of complexes 1 and 4 are also reported.
- Publication:
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Journal of Solid State Chemistry France
- Pub Date:
- January 2019
- DOI:
- 10.1016/j.jssc.2018.09.017
- Bibcode:
- 2019JSSCh.269..246S
- Keywords:
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- Coordination polymer;
- Phenylenediacetate complexes;
- 1;
- 4-bis(2-methylimidazol-1-ylmethyl)benzene complexes;
- Zinc(II) complexes;
- Cadmium(II) complexes