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Assembly of a series of coordination polymers based on rigid tetracarboxylate ligand and flexible bis(imidazole) linker: syntheses, structural diversities, luminescence sensing, and photocatalytic properties

Abstract

Hydrothermal reactions of aromatic terphenyl-4,2″,5″,4′-tetracarboxylic acid (H4tta) and the transitional metal cations in the presence of two flexible N-donor ancillary ligands afford four novel coordination polymers, namely, {[Zn(tta)0.5(m-bimb)]•H2O}n (1), [Ni2(tta)(m-bimb)2(H2O)]n (2), [Ni(H2tta)(o-bimb)•H2O]n (3), and [Cd(tta)0.5(o-bimb)]n (4) were obtained under the solvothermal reactions in the presence of bis(imidazole) bridging linkers (m-bimb = 1,3-bis(imidazol-1-ylmethyl)benzene, and o-bimb = 1,2-bis(imidazol-1-ylmethyl)benzene). Their structures were determined by single-crystal X-ray diffraction analyses and further characterized by elemental analyses (EA), powder X-ray diffraction (PXRD), and thermogravimetric (TG) analyses. Complex 1 displays a 2-fold 3D→3D parallel entangled (4,4)-connected bbf net with the Point Symbol of (64.82)(66)2. Complex 2 features an predocumented 3D (4,8)-connected (32.53.6)(34.44.59.611) net. Complex 3 exhibits a 2D 4-connected sql sheet with the Point Symbol of (44.62). And complex 4 shows a 2D 4-connected (32.62.72) kgm sheet. To our delight, fluorescence measurements show that complex 1 can selectively and sensitively detect Cr3+ cations and nitrobenzene derivatives (nitrobenzene (NB), p-nitrotoluene (PNT), and p-nitroaniline (PNA)), which suggests that CPs of 1 is one promising bifunctional luminescence sensor material that could sense metal ions and small organic molecules.

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Publication details

The article was received on 06 Oct 2017, accepted on 28 Nov 2017 and first published on 28 Nov 2017


Article type: Paper
DOI: 10.1039/C7DT03761A
Citation: Dalton Trans., 2017, Accepted Manuscript
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    Assembly of a series of coordination polymers based on rigid tetracarboxylate ligand and flexible bis(imidazole) linker: syntheses, structural diversities, luminescence sensing, and photocatalytic properties

    X. zhang, H. Chen, B. Li, G. Liu and X. Liu, Dalton Trans., 2017, Accepted Manuscript , DOI: 10.1039/C7DT03761A

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