Synthesis, characterisation and polarographic studies of diastereoisomeric [Cu(Me₈ [14]ane)] (CIO₄)₂ Complexes

Abstract

The isomeric Me₈ [14]anes designated by L_A, L_B, and L_C undErgo facile complexation with copper(II) perchlorale hexahydrate to give two N-chiral isomers in each case. The isomers show distinct colour variation (red to violet) and distinct variations in infrared spectra, specially in fingerprint region. The square planar geometry and stereochemistry of them have been assigned on the basis of analytical, conductometric, magnetochemical and spectroscopic data. Comparison of the <i>d-d </i>bands for the various copper(II) macrocyclic complexes leads to the conclusion that 5,6,5,6 sequence chelate ring is ideal for stable coordination with copper(II). The polarographic reduction or these complexes, shows a single diffusion controlled one electron transfer reversible wave due to the Cu(II)/Cu(I) couple.