Spectroscopic and structural analyses of the copper(II) 2-D coordination polymer {[Cu2(BPP)4(NCS)4]}n (BPP = 1,3-bis(4-pyridyl)propane) comprising interpenetrated layers of (4, 4) topology

The synthesis and structural characterization of the 2-D Cu(II) coordination polymer namely {[Cu2(BPP)4(NCS)4]}n, where BPP is the nitrogen ligand 1,3-bis(4-pyridyl)propane, are described. Single crystal diffraction analysis shows that the asymmetric unit consists on two crystallographically independent Cu(II) ions that adopt a distorted octahedral geometry. Each Cu(II) center is coordinated by four nitrogen atoms from different BPP ligands and by other two nitrogen atoms from isothiocyanate groups. The BPP ligands link the metal centers generating an undulated two-dimensional net of (4, 4) topology. Two sets of two-dimensional sheets interlock each other in the same plane, giving rise to a twofold parallel interpenetrating network. EPR spectra indicate no magnetic coupling of the two individual Cu2+ centers.

Graphical abstractReaction between Cu(II) cation the pseudo-halide SCN− in the presence of the flexible nitrogen ligand 1,3-bis(4-pyridyl)propane (BPP) has afforded a 2-D coordination polymer namely {[Cu2(BPP)4(NCS)4]}n. The compound was characterized by means of elemental analysis, thermal analysis and vibrational and EPR spectroscopies. Single crystal diffraction analysis shows that the 2-D coordination polymer consists on a twofold parallel interpenetrating network.Figure optionsDownload full-size imageDownload as PowerPoint slide