Copper Conjugates of Knoevenagel Condensates of Curcumin and their Schiff Base Derivatives: Synthesis, Spectroscopy, Magnetism, ESR, and Electrochemistry
摘要:
Novel copper(H) complexes of curcumin Knoevenagel condensates and their Schiff bases have been synthesized and characterized. All copper complexes possess distorted square-planar geometries with 1:1 metal to ligand stoichiometry capable of stabilizing Cu2+/Cu1+ redox couples in the range 0.34 to 0.40 V. ESR spectral features are consistent with g(parallel to) > g(perpendicular to) > 2.0 suggesting monomeric nature of copper complexes having d(x2-y2) ground state.