Three new two-dimensional metal-organic coordination polymers derived from bis(pyridinecarboxamide)-1,4-benzene ligands and 1,3-benzenedicarboxylate: Syntheses and electrochemical property

Abstract

Three new metal-organic coordination polymers, [Co( 3- bpcb)(1,3-BDC)]·H 2O ( 1), [Co( 4- bpcb)(1,3-BDC)]·2H 2O ( 2) and [Cu( 4- bpcb)(1,3-BDC)] 2·0.5( 4- bpcb) ( 3), have been hydrothermally synthesized using N, N′-bis(3-pyridinecarboxamide)-1,4-benzene ( 3- bpcb) or N, N′-bis(4-pyridinecarboxamide)-1,4-benzene ( 4- bpcb) and 1,3-benzenedicarboxylate (1,3-H 2BDC) mixed ligands and characterized by elemental analyses, IR, TG, XRPD and single-crystal X-ray diffraction. Complexes 1– 2 exhibit the similar two-dimensional (2D) network with different undulation degrees and dimensions, owing to different N positions from the 3- bpcb and 4- bpcb ligands. 1,3-BDC ligand in complexes 1 and 2 shows two coordination modes. The adjacent 2D layers for 1– 2 are further linked by hydrogen bonding interactions to form a three-dimensional (3D) supramolecular network. Complex 3 possesses infinite 3-fold interpenetrating 2D network composed of three kinds of Cu- 4- bpcb one-dimensional (1D) chains and 1,3-BDC ligands, in which 1,3-BDC only shows one coordination mode. The 2D network is further extended into 3D supramolecular framework by hydrogen bonding interactions. The non-coordinated 4- bpcb ligands existing in the 2D network connect with adjacent 2D layers through the hydrogen bonding interactions. In addition, the electrochemical behaviors and the fluorescence property of complexes 1– 3 have been reported.