Abstract
Abstract A series of three N-(pyrrol-l-yl)salicylaldim ines 1-3 has been prepared an d characterized. Their metal chelate complexes with Cu, Ni and Co are described. The molecular structures of bis[N-(pyrrol-l-yl)salicylaldim inato]copper(lI) la, bis{N-[3-(pyrrol-l-yl)propyl]- salicylaldiminato}nickel(II) 2b and tris{N-[3-(pyrrol-l-yl)propyl]salicylaldiminato}cobalt(III) 2d were determined by X-ray structure analysis. The chelates with tetracoordinated copper and nickel show a square planar coordination with the characteristic trans configuration. The chelate with hexacoordinated cobalt has a meridional coordination sphere. The complexes have also been investigated by X-ray absorption spectroscopy (X̲-ray A̲bsorption N̲ear E̲dge S̲tructure, XANES) at the K edges of the 3d metals. Analyzing the relative intensities of the Is → 3d prepeak and the K edges of the line shape, it was possible to distinguish between planar, tetrahedral and octahedral coordination of the chelates
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