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Mixed metal complexes in solution. Thermodynamic and spectrophotometric study of copper(II)-citrate heterobinuclear complexes with nickel(II), zinc(II) or cadmium(II) in aqueous solution

Mixed metal complexes in solution. Thermodynamic and spectrophotometric study of... Summary A thermodynamic study of CuII−MII-citrate (MII=NiII, ZnII or CdII) ternary systems has been performed by means of potentiometric measurements of hydrogen ion concentration at different temperatures (10, 25, 35 and 45°C) and at I=0.1 mol dm−3 (KNO3). The different binary and ternary systems involved have been further characterized by visible spectra and by calculating the spectra (ε versus λ) of all the CuII complexes. The thermodynamic data suggest strong entropic stabilization for the species under discussion. As regards the visible spectral characteristics of CuII(d-d transitions), the substitution of one CuII ion in the dimer [Cu2(cit)2H−2]4− by NiII or ZnII to form heterobinuclear [CuM(cit)2H−2]4− complexes, gives rise to a change in the visible spectrum. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Transition Metal Chemistry Springer Journals

Mixed metal complexes in solution. Thermodynamic and spectrophotometric study of copper(II)-citrate heterobinuclear complexes with nickel(II), zinc(II) or cadmium(II) in aqueous solution

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References (21)

Publisher
Springer Journals
Copyright
1988 Chapman and Hall Ltd
ISSN
0340-4285
eISSN
1572-901X
DOI
10.1007/bf01087794
Publisher site
See Article on Publisher Site

Abstract

Summary A thermodynamic study of CuII−MII-citrate (MII=NiII, ZnII or CdII) ternary systems has been performed by means of potentiometric measurements of hydrogen ion concentration at different temperatures (10, 25, 35 and 45°C) and at I=0.1 mol dm−3 (KNO3). The different binary and ternary systems involved have been further characterized by visible spectra and by calculating the spectra (ε versus λ) of all the CuII complexes. The thermodynamic data suggest strong entropic stabilization for the species under discussion. As regards the visible spectral characteristics of CuII(d-d transitions), the substitution of one CuII ion in the dimer [Cu2(cit)2H−2]4− by NiII or ZnII to form heterobinuclear [CuM(cit)2H−2]4− complexes, gives rise to a change in the visible spectrum.

Journal

Transition Metal Chemistry – Springer Journals

Published: Apr 1, 1988

Keywords: catalysis; physical chemistry; inorganic chemistry; organometallic chemistry

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