Activation volume as evidence for a dissociative-interchange mechanism of nickel(II) ion complexation with isoquinoline in water, N,N-dimethylformamide, acetonitrile, methanol, and ethanol

Koji Ishihara, Shigenobu Funahashi, Motoharu Tanaka

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Abstract

Activation volumes for the complexation of nickel(II) ion with isoquinoline in various solvents were determined by a high-pressure stopped-flow technique. Values of activation volume for formation and dissociation of the (isoquinoline)nickel(II) complex are respectively 7.4 ± 1.3 and 8.9 ± 0.8 cm3 mol-1 in water, 9.3 ± 0.3 and 12.2 ± 0.3 cm3 mol-1 in N,N-dimethylformamide, 12.8 ± 0.6 and 9.9 ± 0.5 cm3 mol-1 in methanol, and 12.6 ± 0.5 and 15.7 ± 1.1 cm3 mol-1 in ethanol. The activation volume of the complex formation in acetonitrile is 9.4 ± 0.1 cm3 mol-1. All the positive values of the activation volume strongly indicate that the ligand substitution reactions on nickel(II) ion proceed via a dissociative-interchange mechanism in these solvents.

Original languageEnglish
Pages (from-to)2564-2567
Number of pages4
JournalInorganic Chemistry
Volume22
Issue number18
Publication statusPublished - 1983
Externally publishedYes

Fingerprint

Dimethylformamide
Interchanges
Nickel
Complexation
acetonitrile
Methanol
ethyl alcohol
Ethanol
methyl alcohol
Chemical activation
nickel
activation
Ions
Water
water
ions
Substitution reactions
isoquinoline
dissociation
substitutes

ASJC Scopus subject areas

  • Inorganic Chemistry

Cite this

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title = "Activation volume as evidence for a dissociative-interchange mechanism of nickel(II) ion complexation with isoquinoline in water, N,N-dimethylformamide, acetonitrile, methanol, and ethanol",
abstract = "Activation volumes for the complexation of nickel(II) ion with isoquinoline in various solvents were determined by a high-pressure stopped-flow technique. Values of activation volume for formation and dissociation of the (isoquinoline)nickel(II) complex are respectively 7.4 ± 1.3 and 8.9 ± 0.8 cm3 mol-1 in water, 9.3 ± 0.3 and 12.2 ± 0.3 cm3 mol-1 in N,N-dimethylformamide, 12.8 ± 0.6 and 9.9 ± 0.5 cm3 mol-1 in methanol, and 12.6 ± 0.5 and 15.7 ± 1.1 cm3 mol-1 in ethanol. The activation volume of the complex formation in acetonitrile is 9.4 ± 0.1 cm3 mol-1. All the positive values of the activation volume strongly indicate that the ligand substitution reactions on nickel(II) ion proceed via a dissociative-interchange mechanism in these solvents.",
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journal = "Inorganic Chemistry",
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T1 - Activation volume as evidence for a dissociative-interchange mechanism of nickel(II) ion complexation with isoquinoline in water, N,N-dimethylformamide, acetonitrile, methanol, and ethanol

AU - Ishihara, Koji

AU - Funahashi, Shigenobu

AU - Tanaka, Motoharu

PY - 1983

Y1 - 1983

N2 - Activation volumes for the complexation of nickel(II) ion with isoquinoline in various solvents were determined by a high-pressure stopped-flow technique. Values of activation volume for formation and dissociation of the (isoquinoline)nickel(II) complex are respectively 7.4 ± 1.3 and 8.9 ± 0.8 cm3 mol-1 in water, 9.3 ± 0.3 and 12.2 ± 0.3 cm3 mol-1 in N,N-dimethylformamide, 12.8 ± 0.6 and 9.9 ± 0.5 cm3 mol-1 in methanol, and 12.6 ± 0.5 and 15.7 ± 1.1 cm3 mol-1 in ethanol. The activation volume of the complex formation in acetonitrile is 9.4 ± 0.1 cm3 mol-1. All the positive values of the activation volume strongly indicate that the ligand substitution reactions on nickel(II) ion proceed via a dissociative-interchange mechanism in these solvents.

AB - Activation volumes for the complexation of nickel(II) ion with isoquinoline in various solvents were determined by a high-pressure stopped-flow technique. Values of activation volume for formation and dissociation of the (isoquinoline)nickel(II) complex are respectively 7.4 ± 1.3 and 8.9 ± 0.8 cm3 mol-1 in water, 9.3 ± 0.3 and 12.2 ± 0.3 cm3 mol-1 in N,N-dimethylformamide, 12.8 ± 0.6 and 9.9 ± 0.5 cm3 mol-1 in methanol, and 12.6 ± 0.5 and 15.7 ± 1.1 cm3 mol-1 in ethanol. The activation volume of the complex formation in acetonitrile is 9.4 ± 0.1 cm3 mol-1. All the positive values of the activation volume strongly indicate that the ligand substitution reactions on nickel(II) ion proceed via a dissociative-interchange mechanism in these solvents.

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