Equilibrium constants of mixed ligand complexes of Cu(II), Co(II) with complexones and some amino acids

eng Ansari Education and Research Society Journal of Ultra Chemistry 0973-3450 2319-8036 December 2007 3 2 225 227 juc 669 article Equilibrium constants of mixed ligand complexes of Cu(II), Co(II) with complexones and some amino acids Sandhya Singh 1 Anuradha Singh 2 R.K. Singh 2 Department of Chemistry K.N. Govt., P.G. Collge, Gyanpur, Sant Ravidas Nagar, Bhadohi (U.P.) (INDIA) Department of Chemistry K.N. Govt., P.G. College, Gyanpur, Sant Ravidas Nagar, Bhadohi (U.P.) (INDIA) Equilibrium constants (log K (log Kof the ligand complexes of the type MAL, where M = Cu(II) and Co(II) A = IMDA, NTA, EDTA or CDTA and L = α-alanine (α-ala) or ß-alanine (ß-ala), have been determined potentiometrically by Irving-Rossotti approach at 25°C and at an ionic strength, 1=0.2 (mol dm-3 KNO3). The observed trends in equilibrium constants are; (i) Cu(II) > Co(II) (ii) α-ala >ß-ala (iii) IMDA>NTA>EDTA>CDTA with respect to metal ions, secondary ligand (L) and primary ligand (A) respectively. The log K1 values are negative. The equilibrium constants log  and log have also been determined and compared with the log  values. https://journalofchemistry.org/paper/669/ equilibrium constants