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Structural Diversity of Zn(II) Based Coordination Polymers Constructed from a Flexible Carboxylate Linker and Pyridyl Co-linkers : Fluorescence Sensing of Nitro-aromatics

Abstract

The flexible carboxylate linker, H3L = 5-(2-carboxybenzyloxy)isophthalic acid and a group of N-donor co-linkers such as 1,2-di(4-pyridyl)ethylene (dpe), 1,2-di(4-pyridyl)ethane (1,2-dpe), 1,2-di(pyridin-4-yl)diazene (dpd), and 1,3-di(4-pyridyl)propane (1,3-dpp), give rise to five new coordination polymers (CPs) with Zn(II) ions. These are, {[Zn2(L)(µ-OH)(dpe)(H2O)]}n (1), {[Zn(L)(1,2-dpe)1.5]•H2O}n (2), {[Zn(HL)(dpd)1.5]2•2(H2O)}n (3), {[Zn(HL)(1,3-dpp)]}n (4), and {[Zn5(L)4(H2O)2]•8(H2O) (1,2-dpe)}n (5). CP 1 forms a densely packed 3D framework with a rare topological type, ose; 7/3/o5; sqc59. Both CP 2 and 3 form [2+2] metallacyclic units which form a 1D chain that link other chains by strong O-H∙∙∙N type H-bonding to result a 3D supramolecular network. CP 4 forms a 2D sheet structure stacking over each other by C-H∙∙∙π and π∙∙∙π interactions, to give rise to a 3D H-bonded supramolecular structure with topological type, sql/Shubnikov. CP 5 has two type of SBUs with 3D anionic network where channels are filled up with the cationic 1,2-dpe ligands and water molecules which shows rare topological type, 6,10T9. The photoluminescence sensing of nitro-aromatic compounds, especially 2,4,6-trinitrophenol (TNP) by 1–5 indicates that these CPs could be potential candidates for developing luminescence sensors for selective sensing of these species.

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Publication details

The article was received on 20 Jul 2017, accepted on 25 Sep 2017 and first published on 26 Sep 2017


Article type: Paper
DOI: 10.1039/C7NJ02651J
Citation: New J. Chem., 2017, Accepted Manuscript
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    Structural Diversity of Zn(II) Based Coordination Polymers Constructed from a Flexible Carboxylate Linker and Pyridyl Co-linkers : Fluorescence Sensing of Nitro-aromatics

    A. K. Gupta, K. Tomar and P. K. Bharadwaj, New J. Chem., 2017, Accepted Manuscript , DOI: 10.1039/C7NJ02651J

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