A novel 3D metal–organic coordination polymer constructed from two types of tetranuclear copper clusters and a flexible bispyridyl-based ligand with amide-(CH2)6 bridge

A new 3D metal–organic coordination polymer with an unusual 3,3,8,8-connected {4.5.6}4{42.58.612.73.83}{42.59.614.7.82} topology has been synthesized under hydrothermal condition, [Cu4(BTC)2(L)(μ3-OH)2(H2O)] · 6H2O (1) [L = N,N′-bis(3-pyridinecarboxamide)-1,6-hexane, H3BTC = 1,3,5-benzenetricarboxylic acid], which represents the first example of metal–organic frameworks based on two types of tetranuclear copper clusters [Cu4(μ3-OH)2(O2C-)6] and flexible bis-pyridyl-bis-amided based ligand. Moreover, the electrochemical behavior and magnetic property of 1 have been investigated.

Graphical abstractBy introducing the flexible N,N′-bis(3-pyridinecarboxamide)-1,6-hexane (L) in the metal-carboxylate synthetic system, a novel 3D copper(II) complex with unusual {4.5.6}4{42.58.612.73.83} {42.59.614.7.82} topology was obtained, which represents the first example of metal–organic frameworks based on two types of tetranuclear copper(II) clusters [Cu4(μ3-OH)2(O2C-)6] and a flexible bis-pyridyl-bis-amide based ligand. The title complex shows good electrochemical activity and dominant antiferromagnetic behavior.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Flexible ligand L was first introduced into the Cu-polycarboxylate system. ► A novel 3D coordination polymer 1 based on two types of Cu4 clusters is obtained. ► 1 Possesses a 3,3,8,8-connected {4.5.6}4{42.58.612.73.83}{42.59.614.7.82} topology. ► 1 Shows good electrochemical activity and dominant antiferromagnetic behavior.