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Issue 4, 2009
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Conformation control of a flexible 1,4-phenylenediacetate ligand in coordination complexes: a rigidity-modulated strategy

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Abstract

Five coordination complexes based on the flexible ligand 1,4-phenylenediacetic acid (H2pda), formulated as Zn(trans-pda) (1a), Mn(H2O)2(trans-pda) (1b), [M(cis-pda)(4,4′-bipy)]·H2O (M = Zn (2a), Co (2b), Cd (2c); H2pda = 1,4-phenylenediacetic acid; 4,4′-bipy = 4,4′-bipyridine), are reported. The crystal structures of the as-synthesized complexes were determined by single-crystal X-ray diffraction analyses. Complexes 1a and 1b have similar three-dimensional (3-D) network structures built by tetrahedral Zn nodes (for 1a) or octahedral Mn nodes (for 1b) and trans-pda2 bridges. Complexes 2a, 2b, and 2c possess similar two-dimensional (2-D) layered structures constructed from interconnecting metal-cis-pda2− double chains by 4,4′-bipy ligands. It is interesting that conformation of the flexible pda2 ligand is modulated in presence of the rigid 4,4′-bipy ligand. The trans-pda2 ligand was typically isolated in a single pda2 system whereas the cis-pda2 ligand was observed in a mixed pda2/4,4′-bipy system. Furthermore, the dimensionalities of the complexes vary from 3-D (1a and 1b) to 2-D (2a, 2b, and 2c) when auxiliary 4,4′-bipy ligands were introduced. The photoluminescent studies on solid-state samples of complexes 1a, 2a and 2c indicate that the complexes exhibit intense fluorescent emissions at room temperature.

Graphical abstract: Conformation control of a flexible 1,4-phenylenediacetate ligand in coordination complexes: a rigidity-modulated strategy

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Supplementary files

Article information


Submitted
04 Aug 2008
Accepted
03 Nov 2008
First published
04 Dec 2008

CrystEngComm, 2009,11, 583-588
Article type
Paper

Conformation control of a flexible 1,4-phenylenediacetate ligand in coordination complexes: a rigidity-modulated strategy

T. Liu, J. Lü, L. Shi, Z. Guo and R. Cao, CrystEngComm, 2009, 11, 583
DOI: 10.1039/B813444H

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