Synthesis, Characterization, and X-ray Crystal Structures of Zinc(II) Complexes with Schiff Bases 2 - [ (2 - Isopropylaminoethylimino)methyl] - 5 - Methoxyphenol and N,N-Dimethyl-N'- (1 -Pyridin-2-ylethylidene)ethane-1,2-Diamine

摘要

Two new zinc(II) complexes, [ZnBr2L~1] (I) and [ZnBr2L~2] (II), where L~1 is 2-[(2-isopropylami-noethylimino)methyl]-5-methoxyphenol and L~2 is N,N-dimethyl-N'-(l-pyridin-2-yl-ethylidene)ethane-1,2-diamine, were prepared and characterized using elemental analysis, FT-IR spectroscopy, and X-ray single-crystal diffraction. In complex I, the Zn(II) atom is coordinated by one phenolic O and one imino N atoms of L~1 and two Br atoms, forming a tetrahedral coordination geometry. In complex II, the Zn(II) atom is in a trigonal bipyramidal coordination geometry with the equatorial plane formed by the imino N atom of L~2 and two Br atoms and with the two axial positions occupied by one pyridine N and one amino N atoms of L~2. In the crystal structure of I, the mononuclear zinc complex molecules are linked through intermolec-ular N—H···O and N—H-Br hydrogen bonds, forming chains running along the y axis. The chains are further linked via intermolecular C—H···Br hydrogen bonds. In the crystal structure of II, the mononuclear zinc complex molecules are linked through intermolecular C—H···Br hydrogen bonds, forming a 3D network.