Synthesis and crystal structure of copper(II) trifluoroacetates, Cu-2(CF3COO)(4)center dot 2CH(3)CN and Cu(CF3COO)(2)(H2O)(4)

摘要

Cu-2(CF3COO)(4) . 2 CH3CN (I) and Cu(CF3COO)2(H2O)4 (II) have been prepared by concentrating of acetonitrile and aqueous solutions respectively. According to X-ray data, the complex I consists of binuclear molecules with Cu-O 1.969 Angstrom, Cu-N 2.114 Angstrom. The Cu ... Cu distance was found to be 2.766 Angstrom, one of the longest for dimeric structures, apparently, due to the high acidity of trifluoroacetic acid. The coordination environment of Cu atom in II can be described as 4 + 2: 2Cu-O (H2O) 1.937 Angstrom, 2 Cu-O (CF3COO) 1.985 Angstrom, 2Cu-O (H2O) 2.447 Angstrom. The mononuclear structure is stabilized by formation of two in tra-and six intermolecular hydrogen bonds. [References: 12]