Reactions of anionic porphyrin with group 11 elements: a spectrophotometric and electrospray ionization mass spectrometry study

Rita Giovannetti; Vito Bartocci; Filippo Pucciarelli; Massimo Ricciutelli

doi:10.1016/j.talanta.2003.12.036

Reactions of anionic porphyrin with group 11 elements: a spectrophotometric and electrospray ionization mass spectrometry study

Talanta. 2004 Jul 8;63(4):857-64. doi: 10.1016/j.talanta.2003.12.036.

Authors

Rita Giovannetti¹, Vito Bartocci, Filippo Pucciarelli, Massimo Ricciutelli

Affiliation

¹ Dipartimento di Scienze Chimiche, Università di Camerino, Ple G. da Varano, I-62032 Camerino, Italy.

PMID: 18969510
DOI: 10.1016/j.talanta.2003.12.036

Abstract

The reaction of 3,8,13,18-tetramethyl-21H,23H-porphine-2,7,12,17-tetrapropionic acid or coproporphyrin-I (CPI) with the elements of 11 group have been studied. CPI is an anionic porphyrin that slowly reacts with copper ion to form Cu(II)CPI and with silver ions to form Ag(II)CPI, Ag(III)CPI complexes and colloidal silver. Gold ions do not form complexes with CPI, but, in the main, colloidal gold and some CPI-N-oxide. The kinetics of the reactions with copper and silver were spectrophotometerically studied and the rate constants were calculated. The identification and characterization of this water-soluble anionic porphyrin and its metal complexes have been performed by electrospray mass spectrometry (ESI-MS) that proved to be an excellent method for these determinations. The multiple charged parent ions for metal free ligand and their metal complexes were identified.