Transition Metal Chemistry

, 17:430 | Cite as

Kinetic studies on the dissociation of triethylenetetramine complexes of nickel(II) and copper(II) in aqueous acid media

  • Trishna Pramanik
  • Debabrata Banerjea
Full Papers


From stopped-flow spectrophotometric studies on the kinetics of dissociation of [M(trien)]2+ (M=CuII, NiII) to M aq 2+ and trien H 4 4+ in aqueous acid medium, it has been established that the reaction occurs in a complex manner conforming to the relation
$$k_{obs} = k_o + k'_H [H^ + ] + k''_H [H^ + ]^2 $$
At 250 C, I=0.1 mol dm−3 the values of the constants are ko (s−1)=1.2(Ni), 3.0(Cu); k′H (dm3 mol−1 s−1)=37 (Ni), 257 (Cu); k″H (dm6 mol−2 s−1)=0 (Ni), 83,300 (Cu). The enthalpy and entropy of activation for the reactions have been evaluated and a plausible reaction scheme is proposed and discussed.


Acidic Aqueous Solution Bidentate Ligand Transition Meet Tetramine Graphical Evaluation 
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  1. (1).
    A. K. S. Ahmed and R. G. Wilkins,J. Chem. Soc., 3700 (1959): 2895, 2901 (1960).Google Scholar
  2. (2).
    A. K. S. Ahmed and R. G. Wilkins,Proc. Chem. Soc. 399 (1959)Google Scholar
  3. (3).
    G. A. Melson and R. G. Wilkins,J. Chem. Soc., 2662 (1963)Google Scholar
  4. (4).
    D. W. Margerum, D. B. Rorabacher and J. F. G. Clarke, Jr.,Inorg. Chem.,2, 667 (1963).CrossRefGoogle Scholar
  5. (5).
    R. F. Childers and R. A. D. Wentworth,Inorg. Chem.,8, 2218 (1969).CrossRefGoogle Scholar
  6. (6).
    R. G. Wilkins,Acc. Chem. Res.,3, 408 (1970).CrossRefGoogle Scholar
  7. (7).
    J. P. Jones and D. W. Margerum,J. Am. Chem. Soc.,92, 470 (1970).CrossRefGoogle Scholar
  8. (8).
    C. E. Bannister and D. W. Margerum,Inorg. Chem.,20, 3149 (1981).CrossRefGoogle Scholar
  9. (9).
    C. E. Bannister, J. M. T. Raycheba and D. W. MargerumInorg. Chem.,21, 1106 (1982).CrossRefGoogle Scholar
  10. (10).
    R. A. Read and D. W. Margerum,Inorg. Chem.,20, 3143 (1981);22, 3447 (1983)CrossRefGoogle Scholar
  11. (11).
    R. G. Wilkins,J. Chem. Soc., 4475 (1962).Google Scholar
  12. (12).
    C. K. Jorgensen,Acta. Chem. Scand.,11, 399 (1957).CrossRefGoogle Scholar
  13. (13).
    T. J. Kemp, P. Moore and G. R. Quick,J. Chem. Soc. Dalton Trans., 1377 (1979).Google Scholar
  14. (14).
    W. F. K. Wynne-Jones and H. Eyring,J. Chem. Phys.,3, 492 (1935).CrossRefGoogle Scholar
  15. (15).
    S. Gangopadhyay, R. N. Banerjee and D. Banerjea,Transition Met. Chem.,10, 310 (1985).CrossRefGoogle Scholar
  16. (16)(a).
    G. Schwarzenbach,Helv. Chim. Acta,33, 974 (1950); (b)Cf. L. G. Sillen and A. E. Martell (Eds.),Stability Constants of Metal-ion Complexes, Special Publication No. 17, The Chemical Society, London, 1964, Table 407.CrossRefGoogle Scholar
  17. (17).
    F. Basolo and R. K. Murmann,J. Am. Chem. Soc.,74, 5243 (1952).CrossRefGoogle Scholar
  18. (18)(a).
    C. N. Reilly and R. W. Schmid,J. Elisha Mitchell Sci. Soc.,73, 279 (1957); (b)Cf. Ref. 16(b).Google Scholar
  19. (19).
    M. Upadhyay, S. Gangopadhyay and D. Banerjea,J. Indian Chem. Soc.,62, 1029 (1985).Google Scholar

Copyright information

© Chapman & Hall 1992

Authors and Affiliations

  • Trishna Pramanik
    • 1
  • Debabrata Banerjea
    • 1
  1. 1.Inorganic Chemistry Division, Department of ChemistryUniversity College of ScienceCalcuttaIndia

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