Abstract Captopril (H2L) reacts with cobalt(II) in aqueous solution at a neutral pH forming a deep red complex. The reaction rate depends on the temperature, pH, metal ion and ligand concentrations. A solid compound precipitates by acidification of the solution. The chemical, potentiometric, and spectroscopic analyses of the solid complex give the simplest formula, Co(HL)2·H2O, and suggest that the sequence of the bonds is S-Co-S, with the carboxylic group of the ligand remaining uncoordinated. The thermal behaviour of the captopril and its cobalt complex was studied by thermogravimetry, differential thermal analysis and differental scanning calorimetry in dynamic nitrogen and oxygen atmospheres. Copyright © 1990 Published by Elsevier B.V.
Thermoanalytical behaviour of the captopril- cobalt(II) complex / Bucci, Remo; Magri', Andrea; Magri', Antonio; Napoli, Aldo. - In: THERMOCHIMICA ACTA. - ISSN 0040-6031. - STAMPA. - 161:2(1990), pp. 309-316. [10.1016/0040-6031(90)80312-M]
Thermoanalytical behaviour of the captopril- cobalt(II) complex
BUCCI, Remo;MAGRI', Andrea;MAGRI', Antonio;NAPOLI, Aldo
1990
Abstract
Abstract Captopril (H2L) reacts with cobalt(II) in aqueous solution at a neutral pH forming a deep red complex. The reaction rate depends on the temperature, pH, metal ion and ligand concentrations. A solid compound precipitates by acidification of the solution. The chemical, potentiometric, and spectroscopic analyses of the solid complex give the simplest formula, Co(HL)2·H2O, and suggest that the sequence of the bonds is S-Co-S, with the carboxylic group of the ligand remaining uncoordinated. The thermal behaviour of the captopril and its cobalt complex was studied by thermogravimetry, differential thermal analysis and differental scanning calorimetry in dynamic nitrogen and oxygen atmospheres. Copyright © 1990 Published by Elsevier B.V.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.