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(R)-N,N-Bis(2-quinolylmethyl)-S-methyl cystein (L-CysBQA) complexes with Cu2+/Zn2+ and Hg2+. The chiral center of the amino acid dictates the orientation of the quinoline chromophores via a gearing mechanism as illustrated. The transition dipoles in the quinolines in the two complexes invert in the sense of absolute orientation and therefore give opposite ECCD spectra [44]. Reproduced by permission of Wiley.
