An Unusual 3D Coordination Polymer Based on Bridging Interactions of the Nucleobase Adenine
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文摘
The first 3D coordination polymer containing a nucleobase as abridging ligand, {[Cu2(-ade)4(H2O)2][Cu(ox)(H2O)]2·~14H2O}n (1),has been synthesized by reaction of adenine (Hade) with a basicsolution of K2[Cu(ox)2]·2H2O (ox = oxalato dianion). Compound 1 crystallizes in the trigonal space group R with a = b =31.350(1) Å, c = 14.285(1) Å, V = 12158.7(10) Å3, and Z = 9.X-ray analysis shows a covalent 3D network in which the copper(II) centers are bridged by tridentate -N3,N7,N9 adeninate ligands.The compound has relatively large, nanometer-sized tubes associated with the self-assembly process directed solely by metal-ligand interactions. The covalent 3D framework remains intact uponremoval of the guest water molecules trapped in the nanotubes.Magnetic measurements indicate an overall antiferromagneticbehavior of the compound.

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