Synthesis and characterization of a zinc(II) complex of bispicen

S. PARAJÓN-COSTA; G. A. ECHEVERRÍA; O. E. PIRO; E. J. BARAN

ZEITSCHRIFT FUR NATURFORSCHUNG SECTION B - A JOURNAL OF CHEMICAL SCIENCES

VERLAG Z NATURFORSCH

Lugar: Tübingen; Año: 2013 vol. 69b p. 1327 - 1332

0932-0776

The synthesis of a Zn(II) complex of bispicen, the tetradentate ligand N,N?-bis(2-pyridylmethyl)-ethylenediamine, of composition [Zn(bispicen)Cl(H2O)]2 (ZnCl4) is reported. Its crystal and molecular structure was determined by single crystal X-ray diffraction methods. It crystallizes in the monoclinic C2/c space group with Z = 4 molecules per unit cell. The Zn(II) cation in the [Zn(bispicen)Cl(H2O)]+ complex is in a distorted octahedral environment, coordinated to a neutral bispicen molecule acting as a tetra-dentate ligand through their two amine nitrogen atoms, at cis positions with each other, and their two pyridyl N-atoms, at trans positions. The six-fold coordination is completed by a chloride ion and a water molecule. The tetrahedral [ZnCl4]2- counter-ion lies on a crystallographic two-fold axis. The complex was further characterized by FTIR spectroscopy, and its vibrational behavior compared with that of the dihydrated tetrahydrochloride of free bispicen.