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Polarographic investigation of Cu(II) complexes with π donor ligands

✍ Scribed by Banani Datta; Kanaklata Singh; D. Sen

Publisher
Elsevier Science
Year
1980
Tongue
English
Weight
415 KB
Volume
25
Category
Article
ISSN
0013-4686

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✦ Synopsis

The polarographic reduction of Cu(Il) complex chlorides with bignanides and N'amidinoisoureas have been studied in aqueous 0.5 M KCl solution containing 0.01 0/0 gelatin. The complexes [except Cu(enH,dbg)* '1 show two well defined waves whose heights are pH dependent. The first (lower -E ,J and the second waves have been attributed to mono and bis(Ligand)Ca(lI) species respectively. Lower rate constant, higher activation energy and more negative E1,2 values relative to those of u bonded Cu(II) chelates have been explained on the basis olchelate ring current and high n-basicity of the ligands. The gradual change of these values with the size of the N-substituents is due to decreased a-basicity of the respective ligands. Ratio of mono and bis biguanide with pH change has bean calculated and activation energies for the complexes, calculated polarographically, have been found to be closely related to D, values obtained from absorption band maxima.

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