CRYSTAL STRUCTURES OF AZIDO OR THIOCYANATO-COORDINATED NICKEL(II) COMPLEXES WITH TRIDENTATE SCHIFF BASES

Schiff base nickel complex azide thiocyanate crystal structure

КРИСТАЛЛИЧЕСКАЯ СТРУКТУРА ТЕТРА(M-АЦЕТАТО)-БИС{[1-ЭТИЛ-3-(ПИРИДИН-2-ИЛ)КАРБАМИД]МЕДИ}, ИНТЕРПРЕТАЦИЯ РЕНТГЕНОВСКИХ ФОТОЭЛЕКТРОННЫХ СПЕКТРОВ СВОБОДНЫХ НИТРОКСИЛЬНЫХ РАДИКАЛОВ, ...

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 azide and thiocyanate anions readily coordinate to the complexes as secondary ligands. <...> INTRODUCTION 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. <...> Single crystal structural X-ray diffraction was carried out on a Bruker X8 PROTEUM diffractometer. <...> Diffraction intensities for the complexes were collected at 298(2) K using a Bruker X8 PROTEUM diffractometer with MoKh radiation (y = 0.71073 Е). <...> All of the non-hydrogen atoms were refined anisotropically. <...> Single crystal X-ray diffraction shows that the complexes crystallize as similar azido- or thiocyanato-coordinated mononuclear structures (Fig. 1 for 1, Fig. 2 for 2). <...> The Ni atom in each of the complexes is in a square planar coordination environment and is four-coordinated by one phenolate O and two N atoms of the Schiff base ligand and by one N atom of a pseudohalide ligand (azide for 1 and thiocyanate for 2). <...> A slight distortion of the square planar coordination is revealed by the bond angles. <...> 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 azide and thiocyanate anions readily coordinate to the complexes as secondary ligands.. <...>

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