Abstract
The mol-ecular bis-chelate complex (2-{[(2-hy-droxy-ethyl-κO)amino-κN]meth-yl}-6-meth-oxy-phenolato-κO)(2-{[(2-hy-droxy-eth-yl)imino-κN]meth-yl}-6-meth-oxy-phenolato-κO)copper(II), [Cu(C10H14NO3)(C10H12NO3)] or [Cu(HL im)(HL am); HL im = C10H14NO3; HL am = C10H12NO3, represents the first compound containing a salicyl-idene-2-ethano-lamine type ligand in both imino HL im (Schiff base) and amino HL am (reduced Schiff base) forms that has been structurally characterized on the basis of X-ray data. Two mol-ecules of the monodeprotonated ligands coordinate the CuII ion in an (N,O phen)-bidentate and an (N,O phen,O alc)-tridentate fashion in the case of the imino and amino forms, respectively. The shape of the CuN2O3 coordination polyhedron is a distorted square-pyramid (geometry index τ5 = 0.26). Inter-molecular N-H⋯O and O-H⋯O hydrogen bonds, involving H atoms of the amino and hy-droxy-ethyl groups, create a two-dimensional supra-molecular array extending parallel to (010).
Highlights
Over the last decade, research on transition-metal complexes with salicylidene-type Schiff bases (SB) gained a new impetus after a number of highly effective and simple M-(SB) catalysts were obtained, where M = Cu, Co, Al, etc (Payne et al, 2020; Mitra et al, 2015; Fei et al, 2014; Saha et al, 2013)
Continuing our work on the elaboration of alternative methods for the synthesis of coordination compounds (Kokozay et al, 2018), we have investigated the following system: zinc – copper – H2L – ammonium thiocyanate – methanol, to prepare heterometallic Cu/Zn complexes with the Schiff base H2Lim, which is formed in situ upon condensation of o-vanillin and 2-aminoethanol
We report the crystal structure of the title compound, [Cu(HLim)(HLam)] (I), which represents the first example of a mixed (SB/reduced Schiff bases (RSB)) complex derived from salicylidene-2-aminoethanol type ligands
Summary
Research on transition-metal complexes with salicylidene-type Schiff bases (SB) gained a new impetus after a number of highly effective and simple M-(SB) catalysts were obtained, where M = Cu, Co, Al, etc (Payne et al, 2020; Mitra et al, 2015; Fei et al, 2014; Saha et al, 2013). Continuing our work on the elaboration of alternative methods for the synthesis of coordination compounds (Kokozay et al, 2018), we have investigated the following system: zinc (powder) – copper (powder) – H2L – ammonium thiocyanate – methanol, to prepare heterometallic Cu/Zn complexes with the Schiff base H2Lim, which is formed in situ upon condensation of o-vanillin and 2-aminoethanol. We report the crystal structure of the title compound, [Cu(HLim)(HLam)] (I), which represents the first example of a mixed (SB/RSB) complex derived from salicylidene-2-aminoethanol type ligands
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