Issue 3, 2016

3,5-Bis((4′-carboxylbenzyl)oxy)benzoilate-based coordination polymers: their synthesis, structural characterization, and sensing properties

Abstract

With the assistance of various organic bases, hydrothermal reactions of transition-metal salts with a kind of tripodal tricarboxylic acid, 3,5-bis((4′-carboxylbenzyl)oxy)benzoic acid (H3(bcbob)), at different pH values were carried out, producing four new bcbob-based 3-D coordination polymers: [Ni2(Hbcbob)2(bimb)2] (bimb = 1,4-bis(imidazol-1-yl-methyl)benzene) 1, [Zn3(bcbob)2(bpe)2] (bpe = 1,2-bis(4-pyridyl)ethene) 2, [H2(bpp)][Mn2(bcbob)2] (bpp = 1,2-bis(4-piperidyl)propane) 3, and [Cd2(OH)(bcbob)(bpe)0.5]·H2O 4. X-ray single-crystal diffraction analysis reveals that (i) in 1, the bcbob molecules link the Ni2+ centers into a 2-D layer with a (6,3) net, and then the bimb molecule serves as the pillar linker; (ii) in 2, the bpe molecule is only used to stabilize the 3-D network. The bcbob molecules link two types of tetrahedral Zn2+ ions into a 3-D network with a pcu topology; and (iii) the 3-D networks of 3 and 4 are both built up from carboxylate-bridged rod-shaped secondary building units (SBUs) by the bcbob molecules (acting as a 3-connected node), and three types of 1-D channels are observed. However, since the rod-shaped SBUs contain different structures, the side walls of the channels exhibit different arrangements. In particular, the side wall in 4 adopts a helical arrangement. The bcbob molecules act as the side wall of the channel. In 3, the H2(bpp)2+ molecules occupy the space of the largest channels, while in 4, the bpe molecules occlude one type of smaller channels by coordinating to the Cd2+ ions on the side wall. The photoluminescence analysis reveals that 2 and 4 can serve as chemosensors to detect the ppm-grade nitrobenzene (250 ppm for 2, 150 ppm for 4).

Graphical abstract: 3,5-Bis((4′-carboxylbenzyl)oxy)benzoilate-based coordination polymers: their synthesis, structural characterization, and sensing properties

Supplementary files

Article information

Article type
Research Article
Submitted
06 Nov 2015
Accepted
26 Dec 2015
First published
28 Dec 2015

Inorg. Chem. Front., 2016,3, 406-416

Author version available

3,5-Bis((4′-carboxylbenzyl)oxy)benzoilate-based coordination polymers: their synthesis, structural characterization, and sensing properties

J. Huang, X. Zhang, Q. Huo, J. Yu and J. Xu, Inorg. Chem. Front., 2016, 3, 406 DOI: 10.1039/C5QI00241A

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