Abstract
AbstractFive N,N‐dialkylamino acids were synthesised [4]: N,N‐dimethylisoleucine (DMIL), N,N‐dimethyl‐alloisoleucine (DMAIL), N,N‐dimethylvaline (DMV), N,N‐diethyl‐alanine (DEA), and N,N‐diethylvaline (DEV), as well as their complexes with copper(II): Cu(DMIL)2, Cu(DMAIL)2, Cu(DMV)2, Cu(DMIL)(DMV), Cu(DEA)2, and Cu(DEV)2. UV/VIS spectra of the complexes were recorded in CH2Cl2 solutions and the ESR spectra in CH2Cl2, CD3OD, and D2O solutions. By applying the analysis of variance, ESR spectra were shown to be influenced by the solvent and substituent differences, the former effect being related to the degree of covalency of the copper‐ligand bonds. The effect of the ligand's spatial configuration (diastereoisomerism) upon the ESR spectrum of the complex was demonstrated and explained.
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