Copper and nickel complexes of the tetradentate ligand derived from the condensation of ferrocenoylacetone with 1,2-diaminoethane

摘要

Ferrocenoylacetone [C5H5FeC5H4C(O)CH2C(O)CH3] reacts with 1,2-diaminoethane in refluxing ethanol to yield three isolated isomers H2L, H2L1 and H2L2. In solution, H2L1 and H2L2 can change into H2L on standing over two days. Reaction of the tetradentate enaminone ligand [C5H5FeC5H4C(O)CHdouble bondC(CH3)NHCH2](2) (H2L) with hydrated copper acetate and nickel acetate affords complexes I (LCu) and II (LNi). All compounds have been characterized by elemental analyses, (HNMR)-H-1, IR and UV spectroscopies. The X-ray crystallography of complexes I and II reveals that the enaminone dianion coordinates to the central metal ion (copper and nickel) via two oxygen and two nitrogen atoms, and complex I exists as a mixture of the anti and syn isomers in a molar ratio of 1:1 while the complex III exists as a single syn isomer. (C) 2003 Elsevier Ltd. All rights reserved.