Mechanism of Iron(III) Complex Formation. Activation Volumes for the Complexation of the Iron(III) Ion with Thiocyanate Ion and Acetohydroxamic Acid

Shigenobu Funahashi; Koji Ishihara; Motoharu Tanaka

doi:10.1021/ic00156a026

Mechanism of Iron(III) Complex Formation. Activation Volumes for the Complexation of the Iron(III) Ion with Thiocyanate Ion and Acetohydroxamic Acid

Shigenobu Funahashi, Koji Ishihara, Motoharu Tanaka

Research output: Contribution to journal › Article › peer-review

51 Citations (Scopus)

Abstract

Activation volumes (ΔV^‡) for the complexation of the iron(III) ion with thiocyanate (SCN^-) and acetohydroxamic acid (Hahx) were determined by a high-pressure stopped-flow technique. The values of ΔV^‡ for reaction of Fe³⁺ are -6.1 - 1.0 cm³ mol^″1 for SCN^- and -10.0 - 1.4 cm³ mol^-1 for Hahx, whereas the ΔV‡ values of the FeOH²⁺ ion are 8.5 -1.2 cm³ mol^″1 for SCN^- and 7.7 - 0.6 cm³ mol^-1 for Hahx. Complexation of FeOH²⁺ is dissociatively activated but that of Fe associatively. No apparent parallel relationship is observed between ΔV‡ and corresponding AS values.

Original language	English
Pages (from-to)	2070-2073
Number of pages	4
Journal	Inorganic Chemistry
Volume	22
Issue number	14
DOIs	https://doi.org/10.1021/ic00156a026
Publication status	Published - 1983 Jul
Externally published	Yes

ASJC Scopus subject areas

Physical and Theoretical Chemistry
Inorganic Chemistry

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title = "Mechanism of Iron(III) Complex Formation. Activation Volumes for the Complexation of the Iron(III) Ion with Thiocyanate Ion and Acetohydroxamic Acid",

abstract = "Activation volumes (ΔV‡) for the complexation of the iron(III) ion with thiocyanate (SCN-) and acetohydroxamic acid (Hahx) were determined by a high-pressure stopped-flow technique. The values of ΔV‡ for reaction of Fe3+ are -6.1 - 1.0 cm3 mol″1 for SCN- and -10.0 - 1.4 cm3 mol-1 for Hahx, whereas the ΔV‡ values of the FeOH2+ ion are 8.5 -1.2 cm3 mol″1 for SCN- and 7.7 - 0.6 cm3 mol-1 for Hahx. Complexation of FeOH2+ is dissociatively activated but that of Fe associatively. No apparent parallel relationship is observed between ΔV‡ and corresponding AS values.",

author = "Shigenobu Funahashi and Koji Ishihara and Motoharu Tanaka",

year = "1983",

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pages = "2070--2073",

journal = "Inorganic Chemistry",

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publisher = "American Chemical Society",

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T1 - Mechanism of Iron(III) Complex Formation. Activation Volumes for the Complexation of the Iron(III) Ion with Thiocyanate Ion and Acetohydroxamic Acid

AU - Funahashi, Shigenobu

AU - Ishihara, Koji

AU - Tanaka, Motoharu

PY - 1983/7

Y1 - 1983/7

N2 - Activation volumes (ΔV‡) for the complexation of the iron(III) ion with thiocyanate (SCN-) and acetohydroxamic acid (Hahx) were determined by a high-pressure stopped-flow technique. The values of ΔV‡ for reaction of Fe3+ are -6.1 - 1.0 cm3 mol″1 for SCN- and -10.0 - 1.4 cm3 mol-1 for Hahx, whereas the ΔV‡ values of the FeOH2+ ion are 8.5 -1.2 cm3 mol″1 for SCN- and 7.7 - 0.6 cm3 mol-1 for Hahx. Complexation of FeOH2+ is dissociatively activated but that of Fe associatively. No apparent parallel relationship is observed between ΔV‡ and corresponding AS values.

AB - Activation volumes (ΔV‡) for the complexation of the iron(III) ion with thiocyanate (SCN-) and acetohydroxamic acid (Hahx) were determined by a high-pressure stopped-flow technique. The values of ΔV‡ for reaction of Fe3+ are -6.1 - 1.0 cm3 mol″1 for SCN- and -10.0 - 1.4 cm3 mol-1 for Hahx, whereas the ΔV‡ values of the FeOH2+ ion are 8.5 -1.2 cm3 mol″1 for SCN- and 7.7 - 0.6 cm3 mol-1 for Hahx. Complexation of FeOH2+ is dissociatively activated but that of Fe associatively. No apparent parallel relationship is observed between ΔV‡ and corresponding AS values.

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Mechanism of Iron(III) Complex Formation. Activation Volumes for the Complexation of the Iron(III) Ion with Thiocyanate Ion and Acetohydroxamic Acid

Abstract

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