Kinetics and mechanism of complex formation between beryllium(II) and the 3-nitrosalicylatopentaamminecobalt(III) ion

✍ Scribed by Anadi C. Dash; Prakash Mohanty; Achyuta N. Acharya

• Publisher: Springer
• Year: 1995
• Tongue: English
• Weight: 293 KB
• Volume: 20
• Category: Article
• ISSN: 0340-4285
• DOI: 10.1007/bf00139142

✦ Synopsis

The kinetics of formation and dissociation of the binuclear complex of Be 2+ with 3-nitrosalicylatopentaamminecobatt(III) have been investigated in the 20-40 and 25-40 ~ ranges (I = 0.3 mol dm-3), respectively. At 25 ~ the rate and activation parameters for the formation of the binuclear species are: kf = 26.9 x 10 -2 dm 3 mo1-1 s-1, AH * = 104 _+ 7 kJ tool-1 AS e = 91 _+ 22 J K-1 mol -1. The rate constant, activation enthalpy and activation entropy for the acid-catalysed dissociation of the binuclear species are: 1.25 _+ 0.08 dm 3 mol -1 s-1 at 25 ~ 53 _+ 3 kJ 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.