A Flexible Aromatic Tetracarboxylate as a New Linker for Coordination Polymers

Wenjun Gu,Alexander M Kirillov,Jinzhong Gu

doi:10.3390/cryst10020084

Wenjun Gu, Alexander M Kirillov + Show 1 more

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https://doi.org/10.3390/cryst10020084

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Abstract

Two new cadmium(II)-based materials, featuring two-dimensional (2D) [Cd2(μ6-deta)(bpy)(H2O)]n (1) and three-dimensional (3D) [Cd2(μ5-deta)(bpy)2(H2O)]n (2) structures, were constructed by the hydrothermal method from 2,3′,4′,5-diphenyl ether tetracarboxylic acid (H4deta) as an unexplored linker in research on coordination polymers (CPs) and 2,2′-bipyridine (bpy) as a mediator of crystallization. Microcrystalline samples of 1 and 2 were analyzed by IR/PXRD/EA/TGA and X-ray diffraction using single crystals. Structures and topologies of CPs 1 and 2 were established, revealing a 4,6L45 topological layer in 1 and a 3,5T1 topological framework in 2. Structural differences for 1 and 2 are attributed to distinct molar ratios between Cd2+ and bpy during the hydrothermal synthesis. Luminescence and thermal behavior of the obtained materials were also investigated. The present work opens up the use of an unexplored 2,3′,4′,5-diphenyl ether tetracarboxylic acid as a versatile and flexible linker toward the generation of functional coordination polymer materials.

Highlights

We attempted the application of hydrothermal synthesis for the generation of coordination polymers using 2,30,40,5-diphenyl ether tetracarboxylic acid as an unexplored linker
We have explored the simple, aqueous medium protocol to obtain two new two- or three-dimensional CPs/MOFs derived from 2,30,40,5-diphenyl ether tetracarboxylic acid (H4 deta) as an unexplored linker in research on metal–organic frameworks and coordination polymers
This work extends a variety of multifunctional carboxylic acids applied in the synthesis of coordination polymers [44,45,46,47,48,49,50]

Summary

Introduction

Coordination polymers (CPs) and metal–organic frameworks (MOFs) have been extensively explored in different chemistry branches on account of their unique and diverse structures, remarkable functional properties, and important application in a wide variety of fields, which, among others, includes gas adsorption and storage [1,2,3,4], catalysis [5,6,7,8,9], molecular magnetism [10,11,12], and photochemistry [13,14,15,16]. Different aromatic multicarboxylic acids embody a well-explored and adaptable class of ligands for constructing diverse. CPs/MOFs, namely due to their ample coordination behavior, varying levels of deprotonation, good thermal stability, and involvement in H-bond interactions [1,12,13,20,27].

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