Ligand geometry-driven formation of different coordination polymers from Zn(NO3)2, 1,4-bpeb and phenylenediacetic acids?

CrystEngComm Pub Date: 2010-12-06 DOI: 10.1039/C0CE00575D

Abstract

The hydrothermal reactions of Zn(NO3)2·6H2O with 1,4-bis[2-(4-pyridyl)ethenyl]benzene (1,4-bpeb), NaOH, and 1,4-phenylenediacetic acid (1,4-H2PDA), 1,3-phenylenediacetic acid (1,3-H2PDA) or 1,2-phenylenediacetic acid (1,2-H2PDA) afforded three coordination polymers {[Zn(1,4-PDA)(1,4-bpeb)]·2H2O}n (1), [Zn(1,3-PDA)(1,4-bpeb)]n (2) and [Zn4(μ-OH)2(1,2-PDA)3(1,4-bpeb)2]n (3), respectively. All these compounds were characterized by elemental analysis, IR, powder X-ray diffraction, and single-crystal X-ray diffraction. 1 exhibits a five-fold interpenetrating 3D diamondoid framework constructed by linking Zn atoms with trans-1,4-PDA and trans-trans-trans-1,4-bpeb ligands. 2 has a 2D (4,4) network formed by connecting dinuclear [Zn2(1,3-PDA)2] (1,3-PDA serving as a trans conformation) units with trans-cis-trans-1,4-bpeb ligands. 3 could be considered as a 2D 5-connected network derived from linking tetranuclear [Zn4(μ-OH)2(1,2-PDA)3] (1,2-PDA acting as cis and trans conformations) units via trans-cis-trans-1,4-bpeb bridges. The results provided some insight into the ligand geometry-driven assembly of coordination polymers. Thermal stability and photoluminescent properties of 1–3 were also investigated.

Graphical abstract: Ligand geometry-driven formation of different coordination polymers from Zn(NO3)2, 1,4-bpeb and phenylenediacetic acids
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