Reaction volume for the reaction of the hexaaquairon(III) ion with 4-isopropyltropolone in acidic aqueous solution

Masahiro Takagi; Koji Ishihara

doi:10.1016/0020-1693(94)04381-5

Reaction volume for the reaction of the hexaaquairon(III) ion with 4-isopropyltropolone in acidic aqueous solution

Masahiro Takagi, Koji Ishihara^*

^*Corresponding author for this work

School of Advanced Science and Engineering

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

4 Citations (Scopus)

Abstract

The reaction volumes for the protonation of 4-isopropyltropolone (Hipt)(ΔV_H°: Hipt+H⁺ ⇌ H₂ipt⁺) ) and for the reaction of the Fe(III) ion with Hipt(ΔV_FeL°: Fe³⁺ + Hipt ⇌ Fe(ipt)²⁺ + H⁺) have been determined spectrophotometrically in acidic aqueous media under pressure up to 250 MPa. The obtained values are: ΔV_H° (cm³ mol^-1) =+2.8±0.1, ΔV_FeL° (cm³ mol^-1)=7.8±0.1. The activation volume for the dissociation of Fe(ipt)²⁺ was calculated to be -16.5±0.9 cm³ mol^-1 by using ΔV_FeL° and the reported activation volume for the formation of Fe(ipt)²⁺. The negative volume of activation for the dissociation reaction confirms associative activation for the reaction of the Fe³⁺ ion.

Original language	English
Pages (from-to)	157-160
Number of pages	4
Journal	Inorganica Chimica Acta
Volume	232
Issue number	1-2
DOIs	https://doi.org/10.1016/0020-1693(94)04381-5
Publication status	Published - 1995 Apr

Keywords

Activation volume
Iron complexes
Reaction volume
Tropolone complexes

ASJC Scopus subject areas

Physical and Theoretical Chemistry
Inorganic Chemistry
Materials Chemistry

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10.1016/0020-1693(94)04381-5

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@article{ebccbaff28fa40ad9719bc797bb841c5,

title = "Reaction volume for the reaction of the hexaaquairon(III) ion with 4-isopropyltropolone in acidic aqueous solution",

abstract = "The reaction volumes for the protonation of 4-isopropyltropolone (Hipt)(ΔVH°: Hipt+H+ ⇌ H2ipt+) ) and for the reaction of the Fe(III) ion with Hipt(ΔVFeL°: Fe3+ + Hipt ⇌ Fe(ipt)2+ + H+) have been determined spectrophotometrically in acidic aqueous media under pressure up to 250 MPa. The obtained values are: ΔVH° (cm3 mol-1) =+2.8±0.1, ΔVFeL° (cm3 mol-1)=7.8±0.1. The activation volume for the dissociation of Fe(ipt)2+ was calculated to be -16.5±0.9 cm3 mol-1 by using ΔVFeL° and the reported activation volume for the formation of Fe(ipt)2+. The negative volume of activation for the dissociation reaction confirms associative activation for the reaction of the Fe3+ ion.",

keywords = "Activation volume, Iron complexes, Reaction volume, Tropolone complexes",

author = "Masahiro Takagi and Koji Ishihara",

year = "1995",

month = apr,

doi = "10.1016/0020-1693(94)04381-5",

language = "English",

volume = "232",

pages = "157--160",

journal = "Inorganica Chimica Acta",

issn = "0020-1693",

publisher = "Elsevier BV",

number = "1-2",

}

TY - JOUR

T1 - Reaction volume for the reaction of the hexaaquairon(III) ion with 4-isopropyltropolone in acidic aqueous solution

AU - Takagi, Masahiro

AU - Ishihara, Koji

PY - 1995/4

Y1 - 1995/4

N2 - The reaction volumes for the protonation of 4-isopropyltropolone (Hipt)(ΔVH°: Hipt+H+ ⇌ H2ipt+) ) and for the reaction of the Fe(III) ion with Hipt(ΔVFeL°: Fe3+ + Hipt ⇌ Fe(ipt)2+ + H+) have been determined spectrophotometrically in acidic aqueous media under pressure up to 250 MPa. The obtained values are: ΔVH° (cm3 mol-1) =+2.8±0.1, ΔVFeL° (cm3 mol-1)=7.8±0.1. The activation volume for the dissociation of Fe(ipt)2+ was calculated to be -16.5±0.9 cm3 mol-1 by using ΔVFeL° and the reported activation volume for the formation of Fe(ipt)2+. The negative volume of activation for the dissociation reaction confirms associative activation for the reaction of the Fe3+ ion.

AB - The reaction volumes for the protonation of 4-isopropyltropolone (Hipt)(ΔVH°: Hipt+H+ ⇌ H2ipt+) ) and for the reaction of the Fe(III) ion with Hipt(ΔVFeL°: Fe3+ + Hipt ⇌ Fe(ipt)2+ + H+) have been determined spectrophotometrically in acidic aqueous media under pressure up to 250 MPa. The obtained values are: ΔVH° (cm3 mol-1) =+2.8±0.1, ΔVFeL° (cm3 mol-1)=7.8±0.1. The activation volume for the dissociation of Fe(ipt)2+ was calculated to be -16.5±0.9 cm3 mol-1 by using ΔVFeL° and the reported activation volume for the formation of Fe(ipt)2+. The negative volume of activation for the dissociation reaction confirms associative activation for the reaction of the Fe3+ ion.

KW - Activation volume

KW - Iron complexes

KW - Reaction volume

KW - Tropolone complexes

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U2 - 10.1016/0020-1693(94)04381-5

DO - 10.1016/0020-1693(94)04381-5

M3 - Article

AN - SCOPUS:0040105185

SN - 0020-1693

VL - 232

SP - 157

EP - 160

JO - Inorganica Chimica Acta

JF - Inorganica Chimica Acta

IS - 1-2

ER -

Reaction volume for the reaction of the hexaaquairon(III) ion with 4-isopropyltropolone in acidic aqueous solution

Abstract

Keywords

ASJC Scopus subject areas

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