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Issue 45, 2013

pH-Dependent cobalt(ii) frameworks with mixed 3,3′,5,5′-tetra(1H-imidazol-1-yl)-1,1′-biphenyl and 1,3,5-benzenetricarboxylate ligands: synthesis, structure and sorption property

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Abstract

An exploration of reactions of 3,3′,5,5′-tetra(1H-imidazol-1-yl)-1,1′-biphenyl (L) and 1,3,5-benzenetricarboxylic acid (H3BTC) with Co(II) salt has led to the formation of three new complexes with different framework structures, [Co2(L)(HBTC)22-H2O)(H2O)2]·3H2O (1), [Co3(L)2(BTC)2]·4H2O (2) and [Co2(L)(BTC)(μ2-OH)(H2O)2]·2H2O (3). They were obtained as pH-dependent products. The H3BTC ligand is partially deprotonated in 1, but completely in 2 and 3. Furthermore, a bridging OH is present in 3. Complex 1 consists of infinite Co(II)–L chains bridged into a layered structure via carboxylate groups of HBTC2−. In case of 2, it has a Co(II)–L 2D network which is further linked by BTC3− resulting the formation of a final 2D structure (2D + 2D → 2D). While in 3, it is a 3D framework with Co(II)–L layers connected by BTC3−. The results showed that the pH plays an important role in determining the structure of the frameworks. The sorption properties of the complexes were investigated.

Graphical abstract: pH-Dependent cobalt(ii) frameworks with mixed 3,3′,5,5′-tetra(1H-imidazol-1-yl)-1,1′-biphenyl and 1,3,5-benzenetricarboxylate ligands: synthesis, structure and sorption property

Supplementary files

Article information


Submitted
07 Jun 2013
Accepted
29 Jul 2013
First published
31 Jul 2013

CrystEngComm, 2013,15, 9537-9543
Article type
Paper

pH-Dependent cobalt(II) frameworks with mixed 3,3′,5,5′-tetra(1H-imidazol-1-yl)-1,1′-biphenyl and 1,3,5-benzenetricarboxylate ligands: synthesis, structure and sorption property

L. Luo, G. Lv, P. Wang, Q. Liu, K. Chen and W. Sun, CrystEngComm, 2013, 15, 9537 DOI: 10.1039/C3CE41056K

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