Kinetics of formation and dissociation of the ternary complex ion (pentane-2,4-dionato)(nitrilotriacetato)chromate(III) in aqueous media

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• 作者：Bhattacharyya ; Sanjoy Kumar ; Banerjee ; Rupendranath
• 关键词：kinetics ; chromium(III) ; nitrilotriacetic acid ; pentane-2 ; 4-dione ; formation ; aquation
• 刊名：Polyhedron
• 出版年：1997
• 出版时间：October 15, 1997
• 年：1997
• 卷：16
• 期：24
• 页码：4217-4220
• 全文大小：247 K

文摘

Synthesis of solid [Cr(nta)(H₂O)₂] 1, kinetics and equilibrium of its reaction with pentane-2,4-dione (Hpd) to form [Cr(nta)(pd)]⁻ 2 (H₃nta is nitrilotriacetic acid), aquation of 2 into 1, and some related reactions have been described. Parallel proton-independent and inverse proton-dependent paths lead from 1 to 2. The [H⁺]⁻¹ path arises from metal assisted deprotonation of HE, the enol form of Hpd. Aquation of 2 into 1 involves [Cr(Hnta)(pd)(H₂O]⁺ 2H (Hnta is tridentate nta) in addition to 2. The nta complex 1 is considerably more labile and a weaker acid than [Cr(H₂O)₆]³⁺.