Carboxylato bridging Cu(II) coordination polymer: Structure, magnetism and catalytic reduction of nitrophenols

Abstract

The 1D coordination polymer, [Cu 2 ( μ2 -OH) 2 (DABA) 2 ] n ( 1 ), (HDABA = 4-Diallylamino-benzoic acid) is characterized by Single crystal X-Ray diffraction analysis. The structure switches to a 2D geometry by hy- drogen bonding interactions. Hand grinding aqueous suspension of the coordination polymer, 1 , present in nano regime of av . 100 nm dimension and shows catalytic performance in the reduction of toxic nitro- phenols to corresponding aminophenols by NaBH 4 . The rate constant values ( κapp ) are 2.4 ×10 −3 (4-NP), 5.3 ×10 −3 (2,4-DNP) and 5.6 ×10 −3 (2,4,6-TNP) s −1 are much higher than reduction by only NaBH 4 . The susceptibility measurements ( χM T ) of Cu(II) coordination polymer indicates the presence of a very weak antiferromagnetic coupling between the metal centres. The hand grinding technique and reusability of 1 makes the approach chemically green, cost effective and attracts the attention towards the real-life application.