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Thermodynamic and structural study of the parent and some mixed ligand complexes of histamine and 1,3-diaminopropane with copper(II) and nickel(II) ions

✍ Scribed by A. Gergely; I. Sóvágó

Publisher
Elsevier Science
Year
1976
Tongue
English
Weight
601 KB
Volume
20
Category
Article
ISSN
0020-1693

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✦ Synopsis

pH-metric equilibrium studies were used to determine the stability constants of the copper(U) and nickel(II) complexes of histamine and 1,3diaminopropane. In the copper(Ihistamine system it was found that, in addition to the parent complexes CuA2' and CuA:+, a protonated complex CuA2H3' and mixed hydroxo complexes Cu,A,(OH)~' and CuAOH,' are also formed. The protonated complex CuA2H3' is formed in the case of a higher l&and excess at around pH = 5-6, and it is probable that one of the imidazole N atoms does not take part in the coordinate bonding. Electron excitation and ESR spectral data revealed that a certain distortion of the bonds must be reckoned with in the copper(II)histamine complex of composition CuAp, because of steric reasons, and this phenomenon increases the stability of the mixed ligand complexes.

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Electronic structures of square planar c
Electronic structures of square planar cobalt(II), nickel(II) and copper(II) complexes with some N4-macrocyclic ligands [1]
✍ Y. Nishida; K. Hayashida; A. Sumita; S. Kida 📂 Article 📅 1978 🏛 Elsevier Science 🌐 English ⚖ 443 KB

ESR and absorption spectra were measured for the square planar cobalt(II), nickel(II) and copper complexes with some I4, 15 and 16membered N4macrocyclic ligands, such as (14-a), H(14-b), H,(14c), HJIS-c) and H,(16-c) (for the abbreviations, see Fig. 2 in the text). On the basis of the ESR spectra of