Auxiliary ligand effects on the structural dimensionality of copper(II) coordination complexes: from 3D networks to 1D chains

Abstract

Reaction of a hexapodal ligand 1,3,5-triazine-2,4,6-triamine hexaacetic acid (H6TTHA) produced two copper(II) coordination complexes {Cu5(HTTHA)2(H2O)10}n (1) and {Cu2(H2TTHA)(phen)2}n (2) (phen = 1,10-phenanthroline). X-ray structure determination reveals that complex 1 has a complicated 3D structure, in which three coordination styles (tetracoordinate, pentacoordinate, and hexacoordinate geometries) are all present. Complex 2, which includes a phen auxiliary ligand, exhibits an infinite 1D chain network stabilized by hydrogen bonds and π-π stacking interactions. Square [Cu2O2] dimer units are present in both complexes.