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Citation: ZHU Bi-Xue, RUAN Wen-Juan, ZHU Zhi-Ang. Thermodynamic Study of Axial Coordination Reaction of Chiral Salen Fe(Ⅲ) with Imidazoles[J]. Chinese Journal of Applied Chemistry, ;2005, 22(5): 465-469. shu

Thermodynamic Study of Axial Coordination Reaction of Chiral Salen Fe(Ⅲ) with Imidazoles

1.
Department of Chemistry, Nankai University, Tianjin 300071

Corresponding author: RUAN Wen-Juan,
Received Date: 26 July 2004
Available Online: 16 December 2004
Fund Project: 国家自然科学基金(20171024,20271030) (20171024,20271030)天津市自然科学基金(023604011) (023604011)

By means of UV-Vis spectrophotomeric technique,the thermodynamic behavior of chiral Salen iron (Ⅲ)) complexes 1,2 and 3 with imidazole in CHCl₃ was studied.The results show that the association constants decrease in the order of K(sym-Salen Fe^Ⅲ)> K(unsym-Salen Fe^Ⅲ)> K(t-Bu-Salen Fe^Ⅲ) for the axial coordination reaction of different Salen iron (Ⅲ) complexes with the same imidazole ligands.The thermodynamic parameters Δ_rH_m^θ,Δ_rS_m^θ of the axial coordination process were determined,and it was found that the axial coordination reaction is an exothermic and entropy decrease process.The favourable enthalpy change compensates the unfavourable entropy change,and the compensatory enthalpy-entropy relationship contributes to the stability of the axial coordinated product.The results obtained from the circular dichroism spectra are consistent with those from the thermodynamics.
- chiral Salen iro(Ⅲ) complex,
- thermodynamics,
- circular dichroism spectrum
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