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This is supported by the recent studies of luminescence kinetics on the inner-sphere waters of Eu-EDTA and Tb-EDTA, and by the lanthanide-induced 17O NMR shifts of Ln-EDTA. Such spectroscopic studies allow to re-examine the long-lasting controversy of the Gd-break and tetrad effect of logK(Ln-EDTA). Here is proposed a thermodynamic model to elucidate it from the viewpoints: i) hydration changes of Ln-EDTA and light Ln3+ (aq) series, ii) the nephelauxetic effect due to the coordination change of Ln3+ of Ln-EDTA, and iii) the improved equation of Jφrgensen theory applicable to ΔHr and ΔGr. This model satisfies the spectroscopic constraints on the hydration states of Ln-EDTA series: Three and two water molecules exist in the inner spheres of light Ln(La~Nd)-EDTA and heavy Ln(Dy~Lu)-EDTA series, respectively. Each middle Ln(Sm~Tb)-EDTA is a mixture of the two hydrate species, and their abundances are given by the equilibrium of hydration change reaction: [Ln ⋅ EDTA⋅ (H2O)3 ]− (aq ) = [Ln ⋅ EDTA⋅ (H2O)2 ]− (aq ) + H2O(l ). The ΔHr, ΔSr and ΔGr data for Ln-EDTA formation, when corrected for hydration changes in Ln-EDTA and light Ln3+ (aq) series, can be fitted by the improved equation of Jφrgensen theory, and the thermodynamic parameters for the formation of two Ln-EDTA series from octahydrate Ln3+ (aq) have been evaluated. The hydration change of middle Ln-EDTA series explains the apparent Gd-break of logK(Ln-EDTA). The nephelauxetic effect by the change in coordination number for Ln3+ (ΔCN) is evident in ΔH values for the three reactions: (a) [Ln ⋅ EDTA⋅ (H2O)3 ]− (aq ) formation from Ln(oct, aq ) 3+ (ΔCN=+1), (b) [Ln ⋅ EDTA⋅ (H2O)2 ]− (aq ) formation from Ln(oct, aq) 3+ (ΔCN=0), and (c) the hydration change reaction of Ln-EDTA given as (b)-(a) (ΔCN=−1). The relative Racah E1 parameter values for Nd3+, ΔE1(Nd3+), from the tetrad effects of ΔH for (a), (b) and (c), are +(39±14) cm-1, −(19±7) cm-1, and −(58±18) cm-1, respectively. The ΔHr values for (a) with ΔCN=+1 show a large convex tetrad effect, and the ΔSr values also exhibit a similar tetrad effect. Therefore, their tetrad effects are significantly cancelled in ΔGr. 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A puzzle of Gd-break and tetrad effect of aqueous lanthanide(III)-EDTA complex formation: Different Racah parameters between two lanthanide-EDTA complex series with distinct hydration states
http://hdl.handle.net/2237/20317
http://hdl.handle.net/2237/20317a24edf1d-3dd9-4e6a-ab31-f580391e696c
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EDTA-rev-13.pdf (3.9 MB)
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EDTA-rev-Figs_13.pdf (817.8 kB)
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EDTA-Tab_1-3_13.pdf (219.4 kB)
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EDTA-Tab_4-7_13.pdf (289.4 kB)
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Item type | プレプリント / Preprint(1) | |||||
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公開日 | 2014-06-16 | |||||
タイトル | ||||||
タイトル | A puzzle of Gd-break and tetrad effect of aqueous lanthanide(III)-EDTA complex formation: Different Racah parameters between two lanthanide-EDTA complex series with distinct hydration states | |||||
言語 | en | |||||
著者 |
Kawabe, Iwao
× Kawabe, Iwao |
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アクセス権 | ||||||
アクセス権 | open access | |||||
アクセス権URI | http://purl.org/coar/access_right/c_abf2 | |||||
抄録 | ||||||
内容記述 | The logarithmic formation constants (logK) for aqueous lanthanide(III)-EDTA complexes show a Gd-break and subtle tetrad effect, but the ΔSr and ΔHr data indicate step-like changes in the middle Ln. UV-Vis spectra of Eu3+ for Eu-EDTA solution suggest the hydration change occurring across the middle Ln-EDTA series. This is supported by the recent studies of luminescence kinetics on the inner-sphere waters of Eu-EDTA and Tb-EDTA, and by the lanthanide-induced 17O NMR shifts of Ln-EDTA. Such spectroscopic studies allow to re-examine the long-lasting controversy of the Gd-break and tetrad effect of logK(Ln-EDTA). Here is proposed a thermodynamic model to elucidate it from the viewpoints: i) hydration changes of Ln-EDTA and light Ln3+ (aq) series, ii) the nephelauxetic effect due to the coordination change of Ln3+ of Ln-EDTA, and iii) the improved equation of Jφrgensen theory applicable to ΔHr and ΔGr. This model satisfies the spectroscopic constraints on the hydration states of Ln-EDTA series: Three and two water molecules exist in the inner spheres of light Ln(La~Nd)-EDTA and heavy Ln(Dy~Lu)-EDTA series, respectively. Each middle Ln(Sm~Tb)-EDTA is a mixture of the two hydrate species, and their abundances are given by the equilibrium of hydration change reaction: [Ln ⋅ EDTA⋅ (H2O)3 ]− (aq ) = [Ln ⋅ EDTA⋅ (H2O)2 ]− (aq ) + H2O(l ). The ΔHr, ΔSr and ΔGr data for Ln-EDTA formation, when corrected for hydration changes in Ln-EDTA and light Ln3+ (aq) series, can be fitted by the improved equation of Jφrgensen theory, and the thermodynamic parameters for the formation of two Ln-EDTA series from octahydrate Ln3+ (aq) have been evaluated. The hydration change of middle Ln-EDTA series explains the apparent Gd-break of logK(Ln-EDTA). The nephelauxetic effect by the change in coordination number for Ln3+ (ΔCN) is evident in ΔH values for the three reactions: (a) [Ln ⋅ EDTA⋅ (H2O)3 ]− (aq ) formation from Ln(oct, aq ) 3+ (ΔCN=+1), (b) [Ln ⋅ EDTA⋅ (H2O)2 ]− (aq ) formation from Ln(oct, aq) 3+ (ΔCN=0), and (c) the hydration change reaction of Ln-EDTA given as (b)-(a) (ΔCN=−1). The relative Racah E1 parameter values for Nd3+, ΔE1(Nd3+), from the tetrad effects of ΔH for (a), (b) and (c), are +(39±14) cm-1, −(19±7) cm-1, and −(58±18) cm-1, respectively. The ΔHr values for (a) with ΔCN=+1 show a large convex tetrad effect, and the ΔSr values also exhibit a similar tetrad effect. Therefore, their tetrad effects are significantly cancelled in ΔGr. This is a reason why the subtle tetrad-like variation of logK(Ln-EDTA) is asymmetrical between light and heavy Ln, along with the hydration change effects of middle Ln-EDTA and light Ln3+ (aq) series cancelled partly within the light Ln. | |||||
言語 | en | |||||
内容記述タイプ | Abstract | |||||
言語 | ||||||
言語 | eng | |||||
資源タイプ | ||||||
資源 | http://purl.org/coar/resource_type/c_1843 | |||||
タイプ | other | |||||
書誌情報 |
発行日 2014-06-16 |
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著者版フラグ | ||||||
値 | author | |||||
URI | ||||||
識別子 | http://hdl.handle.net/2237/20317 | |||||
識別子タイプ | HDL |