Formation Constants of Some Bivalent and Trivalent Transition Metal Complexes of 4-Carboxaldehyde-1-(2’,4’-Dinitrophenyl) -3-Methyl-2-Pyrazolin-5-one

D. S. Raja, D. K. Bhoib, Ritesh R. Shahc, M. B. Chauhanb,

¹Navjivan Science College, Dahod (India), ²M.B. Patel Science College, Anand (India) ³J and J College of Science, Nadiad (India) ⁴Maninagar Science College, Ahmedabad (India)

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ABSTRACT:

The formation constants (log K1, log K2 and log b2) of 4-carboxaldehyde-1-(2’,4’-dinitrophenyl)-3-methyl-2-pyrazolin-5-one complexes of Cr(III), Fe(III), Co(II), Ni(II) and Cu(II) have been determined by pH-metric method at 30±0.5°C in 70:30 (v/v) dioxane-water medium with 0.1M Potassium nitrate as the constant ionic strength using the method of Calvin-Bjerrum as modified by Irving-Rossotti. The trends in the formation constants of these complexes are discussed.

KEYWORDS:

Metal complexes; formation constants