Weak exchange interaction supported by a biologically relevant long chemical bridge in a Cu-peptide model compound

VIEIRA, ED; CASADO, NMC; FACCHIN, G; TORRE, MH; COSTA- FILHO, AJ; RAFAEL CALVO

INORGANIC CHEMISTRY

American Chemical Society, USA

Año: 2006 vol. 45 p. 2942 - 2947

0020-1669

The weak exchange interaction J3 between Cu(II) ions at 11.07 Å connected by a chemical path containing 11 diamagnetic atoms, including three H-bonds and having total length 18.34 Å, is evaluated using EPR in the copper complex of the dipeptide L-alanyl-L-phenylalanine. Its magnitude, |J3|/kB=1.8×10-3 K, is compared with values obtained in other model systems and in proteins.