NON-COVALENT INTERACTIONS IN THE CRYSTAL OF A NEW MACROCYCLIC Ag(I)-Ni(II) BINUCLEAR COMPLEX

Xiao-Zeng Li,*^a,b Juen-Hong He,^a Bao-Lin Liu,^a and Dai-Zheng Liao^b

^a Department of Chemistry, Tianjin University, Tianjin 300072, P. R. China

^b Department of Chemistry, Nankai University, Tianjin 300071, P. R. China

Abstract

A new binuclear complex, [Ag(NiL)(C₂H₅OH)(NO₃)]∙C₂H₅OH, was prepared by using [NiL] as a new “complex ligand” and was further structurally characterized. The Ag(I) and Ni(II) ions are bridged by the oxamido group from the macrocyclic ligand (L). The coordination environment of the Ag(I) ion is a distorted trigonal bipyramid, and the coordination geometry around the Ni(II) ion is slightly distorted square planar. In the crystal, unique intermolecular π∙∙∙π interactions between a phenyl ring and three separate π-systems that are not aromatic were observed. The π∙∙∙π interactions and C–H∙∙∙O and O–H∙∙∙O hydrogen bonds link the molecules to form a three-dimensional network.

Key words: π∙∙∙π interaction, hydrogen bond, macrocyclic compound, silver(I)-nickel(II) complex