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Concentration Gradient-Induced Syntheses and Crystal Structures of Two Copper(II) Coordination Polymer Based on
Tao Zhou1,2, Gengyi Zhang2, Chunhong Tan1
1School of Chemistry and Chemical Engineering, University of South China, Hengyang 421001, China.
Abstract:
The reaction of copper nitrate, phthalic acid (1,2-H2BDC), and bipyridine in ammonia/ethanol media affords two multi-copper (II) cluster-based coordination polymers, namely {[Cu4(bpy)4(OH)2(BDC)2]·2OH·13H2O}n (USC-CP-6) and {[Cu2(BDC)2(bpy)2(H2O)]·3H2O}n (USC-CP-7), under ambient conditions, with CP-6 forming at the bottom and CP-7 at the upper edge of the same beaker. The single-crystal structures reveal that it is a rare case of gradient-induced formation of different multi-copper(II) cluster-based CPs within a single-solution chemical reaction. CP-6 crystallizes in the monoclinic system, sp. gr. P21/c, and is composed of chair-like tetranuclear [Cu4(μ3-OH)2(bpy)4(BDC)2]2+ clusters as secondary building units, bridged by BDC2- ligands to form a two-dimensional layer framework, while CP-7 crystallizes in the monoclinic system, sp. gr. P21/n, with binuclear [Cu2(1,2-BDC)2(bpy)2(H2O)] clusters linked by bridging BDC2- ligands to form a one-dimensional looped double chain. Through intermolecular π-π stacking and hydrogen bonds between the coordination water, lattice water, and free oxygen atoms from carboxylate, both compounds yield a 3D supramolecular structure.
![[DPEPhosbcpCu]PF6: A General and Broadly Applicable Copper-Based Photoredox Catalyst](/_next/image?url=https%3A%2F%2Fcloudfront.jove.com%2FCDNSource%2Fteasers%2F59739.jpg&w=3840&q=50)
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