A new Wells-Dawson polyoxometalate-based metal-organic hybrid decorated by the flexible bis-pyridyl-bis-amide ligand

Abstract

A new Wells-Dawson polyoxometalate-based compound, H[Cu(L) 2 (P 2 W 18 O 62 ) 0.5 ]·~ 3H 2 O ( 1 ) (L = N,N′-bis(3-pyridinecarboxamide)-1,6- hexane), has been hydrothermally synthesized. Compound 1 is a 2D network based on [P 2 W 18 O 62 ] 6 − polyanion and nonparallel 1D Cu(L) 2 polymer chain constructed from two types of bi-nuclear circles alternately arraying with the dihedral angle of 34.75°. Compound 1 represents the first example of 2D Wells-Dawson POM-based compound constructed from the flexible bis-pyridyl-bis-amide ligand. Moreover, the electrochemical behavior, luminescent property and photocatalytic activity of 1 have been investigated. By introducing the N,N′-bis(3-pyridinecarboxamide)-1,6-hexane (L) in Wells-Dawson type polyoxometalate system, a new 2D inorganic–organic hybrid H[Cu(L) 2 (P 2 W 18 O 62 ) 0.5 ]·~ 3H 2 O was obtained, which represents the first example by combining the Wells-Dawson polyoxometalate with the flexible bis-pyridyl-bis-amide ligand. The title compound shows excellent activity in electrocatalytic reduction of nitrite and photocatalytic degradation of MB. ► Flexible bis-pyridyl-bis-amide was first introduced into the Wells-Dawson POM system. ► A new 2D inorganic–organic hybrid was constructed from [P 2 W 18 O 62 ] 6 − and 1D Cu(L) 2 chain. ► The 1D Cu(L) 2 chain is formed by the alternate arrangement of two types of bi-nuclear circles. ► The compound shows excellent electrocatalytic and photocatalytic activities.