Synthesis and structure of novel copper(II) complexes with pyrazole derived ligands and metal–ligand interaction in solution

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• 作者：Aleks ; er Kufelnicki ; Magdalena Woź ; niczka ; Lilianna Chę ; ciń ; ska ; Magdalena Miernicka ; Elż ; bieta Budzisz
• 关键词：Cu(II) complexes ; Pyrazole derivatives ; Crystal structure ; M– ; L Interactions in solution
• 刊名：Polyhedron
• 出版年：2007
• 出版时间：23 July 2007
• 年：2007
• 卷：26
• 期：12
• 页码：2589-2596
• 全文大小：256 K

文摘

Two new ligands of the coumarin type have been synthesized and characterized by ¹H, ¹³C NMR, IR and MS. The crystal and molecular structures of ligand 2, determined by the X-ray diffraction method, are presented. With copper(II) these ligands create solid complexes of the type CuLCl₂, where L is 5-(2-hydroxybenzoyl)-3-methyl-1-(2-pyridinyl)pyrazol-4-carboxylic acid methyl ester (2) or 3-methyl-1-(2-pyridinyl)-1H-chromene[4,3-c]pyrazol-4-on (3). The new copper(II) complexes have been characterized by elemental analysis and solid state FT-IR. The protonation constants of ligands 2 and 3 have been determined in 5 % v/v 1,4-dioxane–water solution (25 °C). The coordination modes in the complexes with copper(II) are discussed for 2 on the basis of potentiometric and UV–Vis data.