2013. 54, 5 – UDC 548.73:547.13:546.74 CRYSTAL STRUCTURES OF AZIDO OR THIOCYANATO-COORDINATED NICKEL(II) COMPLEXES WITH TRIDENTATE SCHIFF BASES S.-S. Qian1, M. Zhang2, Z.-L. You2, H.-L. Zhu1 1School of Life Sciences, Shandong University of Technology, ZiBo, P. R. China 2Department of Chemistry and Chemical Engineering, Liaoning Normal University, Dalian, P. R. China E-mail: hailiang_zhu@163.com (Hai-Liang Zhu); youzhonglu@yahoo.com.cn (Zhong-Lu You) Received May, 21, 2012 A new azido-coordinated nickel(II) complex [NiL1(N3)] (1) and a new thiocyanato-coordinated nickel(II) complex [NiL2(NCS)] (2), where L1 and L2 are the monoanionic forms of Schiff bases 2-[(2-isopropylaminoethylimino)methyl]-6-methylphenol and 2-[(2-dimethlaminoethylimino)methyl]-6-methylphenol respectively, are prepared and structurally characterized by elemental analysis, IR spectra, and single crystal X-ray crystallography. <...> The Ni atom in each of the complexes is coordinated by three donor atoms of the Schiff base ligand and by one N atom of the azide or thiocyanate ligand, forming a square planar geometry. <...> The Schiff bases derived from salicylaldehyde and its derivatives are a kind of versatile ligands in coordination chemistry [ 1—3]. <...> The search in the Cambridge Crystallographic Database (CSD; version 5.32 with addenda up to February 2012) [ 15 ] has revealed that no complexes derived from 2-[(2-isopropylaminoethylimino)methyl]-6-methylphenol (HL1; Scheme 1) and 2-[(2-dimethlaminoethylimino)methyl]-6methylphenol (HL2; Scheme 1) have been reported, and even very few complexes have been reported based on the Schiff bases derived from 3-methylsalicylaldehyde. <...> In this paper, a new azido-coordinated nickel(II) complex [NiL1(N3)] (1) and a new thiocyanato-coordinated nickel(II) complex . 888 – 892 Scheme 1. <...> The IR spectra were recorded on a Jasco FT/IR-4000 spectrometer as KBr pellets in the 4000—200 cm–1 region. <...> Single crystal structural X-ray diffraction was carried out on a Bruker X8 PROTEUM diffractometer. <...> To the methanolic solution (20 ml) of 3-methylsalicylaldehyde (1.0 mmol, 0.14 g) was added a methanolic solution (20 ml) of N-isopropylethane-1,2-diamine (1.0 mmol, 0.10 g) with stirring. <...> The mixture was stirred for 30 min <...>