Kinetics and mechanism of complex formation between beryllium(II) and the 3-nitrosalicylatopentaamminecobalt(III) ion |
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Authors: | Anadi C. Dash Prakash Mohanty Achyuta N. Acharya |
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Affiliation: | (1) Department of Chemistry, Utkal University, 751 004 Vani Vihar, Bhubaneswar, India;(2) Department of Chemistry, Institute of Textile Technology, 754 025 Choudwar, India |
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Abstract: | Summary The kinetics of formation and dissociation of the binuclear complex of Be2+ with 3-nitrosalicylatopentaamminecobalt(III) have been investigated in the 20–40 and 25–40 °C ranges (I = 0.3 mol dm –3), respectively. At 25 °C the rate and activation parameters for the formation of the binuclear species are: kf = 26.9 × 102 dm3mol–1s–1, H = 104 ± 7kJ mol–1 S= 91 ± 22JK–1mor–1.The rate constant, activation enthalpy and activation entropy for the acid-catalysed dissociation of the binuclear species are: 1.25 ± 0.08dm3mol –1 at 25 °C, 53 ± 3kJ mol–1 and - 67 ± 9 J K –1 mol–1, respectively. The formation of the binuclear species is chelation controlled while the dechelation is acid catalysed. |
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