Synthesis, Crystal Structure and Optical Properties of a Three-Dimensional Supramolecule Assembled by a Dinuclear Neodymium Cluster

The reaction of isonicotinic acid (IN), sodium hydroxide, 1,10-phenanthroline (phen) and neodymium nitrate leads to the formation of a novel complex [Nd(phen)(IN)(2)(NO(3))(H(2)O)(2)](2) 1, which has been characterized by single crystal X-ray diffraction analysis: monoclinic, space group C2/c, with a = 24.93(2) angstrom, b = 9.452(3) angstrom, c = 21.406(5) angstrom, beta = 97.87(2)degrees, and Z = 4. Complex 1 consists of a centrosymmetric dinclear molecule, and neodymium atoms are bridged by two carboxyl groups of two IN ligands. The dinuclear clusters of 1 are connected each other into a three-dimensional (3D) supramolecular framework, which is stabilized by O-H center dot center dot center dot O, O-H center dot center dot center dot N hydrogen bonds as well as pi-pi stacking interactions. Its electronic absorption and luminescence properties have also been investigated.