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12.
Potentiometric Study of Dissociation Constants of
1,2-Bis(dimethy)glyloxime and 1,2-Bis(dichloro)glyoxime and
Stability Constants of their Copper, Nickel and Zinc Complexes
Faisal N. Al-Obaidi1*, Mustafa Macit2
and Hayati Sari3
1 The University of Mustansiriya, Department of
Chemistry, College of Science, Baghdad, Iraq.
2 Ondokuzmayıs University, Department of Chemistry, 55139
Samsun, Turkey
3 Gaziosmanpaşa University, Faculty of Science and Arts,
Department of Chemistry, 60250 Tokat, Turkey.
* E-mail
fobaidi@uomustansiriyah.edu.iq
Abstract:
The
complexation reaction between dimethyglyloxime (DMG) and
dichloroglyoxime (DCG) with certain transition metal ions Ni2+,
Zn2+, and Cu2+ has been studied
potentiometrically in aqueous solution at 25±0.1 ºC and ionic
strength (I) of 0.1 mol dm-3 supported by NaCl. The
overall stability constants logβ ’s of respective species were
obtained by computer refinement of pH–volume data using the
SUPERQUAD program. The dissociation constants of the ligands DMG
and DCG are 6.01 and 8.97 and 3.438, 6.110, 7.252 and 8.873,
respectively. The main species in binary systems are ML2,
MHL2, MH2L2, MH3L2,
MH4L2 MOHL2, and M(OH)2L2,
(L =DMG and DCG).
Key words:
Dimethyglyloxime, dichloroglyoxime, dissociation
constants, stability constants, SUPERQUAD.
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