A new double layered 2-D copper(II) coordination polymer based on a semi-rigid ligand

Abstract

A new 2-D Cu(II) coordination polymer, [Cu2(L)(H2O)3]·4.5H2O (1) [H4L = 5,5′-(pyrazine-2,3-diylbis(azanediyl))diisophthalic acid], has been synthesized from the reaction of Cu(NO3)2·3H2O with H4L under solvothermal conditions. H4L was prepared and characterized by 1H NMR, 13C NMR, elemental analysis (EA), and infrared spectroscopy (IR). X-ray single-crystal diffraction analysis reveals that 1 crystallized in the hexagonal space group P6522 with a = 16.318(1), b = 16.318(1), c = 35.632(6) Å, V = 8217.0(8) Å3, Z = 12 and afforded 2-D grid-like double layers with a [3,5] topology network. The staggered arrangement of the 2-D layers afforded a dense structure through H-bonds. Further characterizations for 1 were performed by powder X-ray diffraction, thermogravimetric analysis, EA, IR, etc. Magnetic measurements revealed antiferromagnetic interactions between the adjacent Cu(II) centers within 1.