Cobalt(II) chloro complexation in N-methylformamide-N, N-dimethylformamide mixtures

TTTTitration calorimetry and spectrophotometry

K. Fujii, Y. Matsumoto, Y. Kaieda, Daisuke Kobayashi, Y. Umebayashi, S. Ishiguro

研究成果: ジャーナルへの寄稿記事

3 引用 (Scopus)

抄録

Cobalt(II) chloro complexation has been studied by titration calorimetry and spectrophotometry in solvent mixtures of N-methylformamide (NMF) and N,N-dimethylformamide (DMF). It revealed that a series of mononuclear CoCln n (2-n)+ (n=1-4) complexes are formed in the mixtures of NMF mole fraction x NMF =0.05 and 0.25, and the CoCl + , CoCl 3 - and CoCl 4 2- complexes in the mixture of x NMF =0.5, and their formation constants, enthalpies and entropies were obtained. As compared with DMF, the complexation is markedly suppressed in the mixtures, as well as in NMF. The decreasing formation constant of CoCl + with the NMF content is mainly ascribed to the decreasing formation entropy. DMF is aprotic and thus less-structured, whereas NMF is protic to form hydrogen- bonded clusters. In DMF-NMF mixtures, solvent clusters in neat NMF are ruptured to yield new clusters involving DMF, the structure of which depends on the solvent composition. The entropy of formation of CoCl + will be discussed in relation to the liquid structure of DMF, NMF and their mixtures.

元の言語英語
ページ(範囲)567-573
ページ数7
ジャーナルJournal of Thermal Analysis and Calorimetry
85
発行部数3
DOI
出版物ステータス出版済み - 9 1 2006

Fingerprint

methylformamide
Dimethylformamide
Spectrophotometry
Calorimetry
spectrophotometry
Cobalt
Complexation
cobalt
heat measurement
entropy
Entropy
titration
enthalpy

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry

これを引用

Cobalt(II) chloro complexation in N-methylformamide-N, N-dimethylformamide mixtures : TTTTitration calorimetry and spectrophotometry. / Fujii, K.; Matsumoto, Y.; Kaieda, Y.; Kobayashi, Daisuke; Umebayashi, Y.; Ishiguro, S.

:: Journal of Thermal Analysis and Calorimetry, 巻 85, 番号 3, 01.09.2006, p. 567-573.

研究成果: ジャーナルへの寄稿記事

@article{85e210c9727d4afba06f277b6c48fe97,
title = "Cobalt(II) chloro complexation in N-methylformamide-N, N-dimethylformamide mixtures: TTTTitration calorimetry and spectrophotometry",
abstract = "Cobalt(II) chloro complexation has been studied by titration calorimetry and spectrophotometry in solvent mixtures of N-methylformamide (NMF) and N,N-dimethylformamide (DMF). It revealed that a series of mononuclear CoCln n (2-n)+ (n=1-4) complexes are formed in the mixtures of NMF mole fraction x NMF =0.05 and 0.25, and the CoCl + , CoCl 3 - and CoCl 4 2- complexes in the mixture of x NMF =0.5, and their formation constants, enthalpies and entropies were obtained. As compared with DMF, the complexation is markedly suppressed in the mixtures, as well as in NMF. The decreasing formation constant of CoCl + with the NMF content is mainly ascribed to the decreasing formation entropy. DMF is aprotic and thus less-structured, whereas NMF is protic to form hydrogen- bonded clusters. In DMF-NMF mixtures, solvent clusters in neat NMF are ruptured to yield new clusters involving DMF, the structure of which depends on the solvent composition. The entropy of formation of CoCl + will be discussed in relation to the liquid structure of DMF, NMF and their mixtures.",
author = "K. Fujii and Y. Matsumoto and Y. Kaieda and Daisuke Kobayashi and Y. Umebayashi and S. Ishiguro",
year = "2006",
month = "9",
day = "1",
doi = "10.1007/s10973-006-7643-x",
language = "English",
volume = "85",
pages = "567--573",
journal = "Journal of Thermal Analysis and Calorimetry",
issn = "1388-6150",
publisher = "Springer Netherlands",
number = "3",

}

TY - JOUR

T1 - Cobalt(II) chloro complexation in N-methylformamide-N, N-dimethylformamide mixtures

T2 - TTTTitration calorimetry and spectrophotometry

AU - Fujii, K.

AU - Matsumoto, Y.

AU - Kaieda, Y.

AU - Kobayashi, Daisuke

AU - Umebayashi, Y.

AU - Ishiguro, S.

PY - 2006/9/1

Y1 - 2006/9/1

N2 - Cobalt(II) chloro complexation has been studied by titration calorimetry and spectrophotometry in solvent mixtures of N-methylformamide (NMF) and N,N-dimethylformamide (DMF). It revealed that a series of mononuclear CoCln n (2-n)+ (n=1-4) complexes are formed in the mixtures of NMF mole fraction x NMF =0.05 and 0.25, and the CoCl + , CoCl 3 - and CoCl 4 2- complexes in the mixture of x NMF =0.5, and their formation constants, enthalpies and entropies were obtained. As compared with DMF, the complexation is markedly suppressed in the mixtures, as well as in NMF. The decreasing formation constant of CoCl + with the NMF content is mainly ascribed to the decreasing formation entropy. DMF is aprotic and thus less-structured, whereas NMF is protic to form hydrogen- bonded clusters. In DMF-NMF mixtures, solvent clusters in neat NMF are ruptured to yield new clusters involving DMF, the structure of which depends on the solvent composition. The entropy of formation of CoCl + will be discussed in relation to the liquid structure of DMF, NMF and their mixtures.

AB - Cobalt(II) chloro complexation has been studied by titration calorimetry and spectrophotometry in solvent mixtures of N-methylformamide (NMF) and N,N-dimethylformamide (DMF). It revealed that a series of mononuclear CoCln n (2-n)+ (n=1-4) complexes are formed in the mixtures of NMF mole fraction x NMF =0.05 and 0.25, and the CoCl + , CoCl 3 - and CoCl 4 2- complexes in the mixture of x NMF =0.5, and their formation constants, enthalpies and entropies were obtained. As compared with DMF, the complexation is markedly suppressed in the mixtures, as well as in NMF. The decreasing formation constant of CoCl + with the NMF content is mainly ascribed to the decreasing formation entropy. DMF is aprotic and thus less-structured, whereas NMF is protic to form hydrogen- bonded clusters. In DMF-NMF mixtures, solvent clusters in neat NMF are ruptured to yield new clusters involving DMF, the structure of which depends on the solvent composition. The entropy of formation of CoCl + will be discussed in relation to the liquid structure of DMF, NMF and their mixtures.

UR - http://www.scopus.com/inward/record.url?scp=33748758465&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=33748758465&partnerID=8YFLogxK

U2 - 10.1007/s10973-006-7643-x

DO - 10.1007/s10973-006-7643-x

M3 - Article

VL - 85

SP - 567

EP - 573

JO - Journal of Thermal Analysis and Calorimetry

JF - Journal of Thermal Analysis and Calorimetry

SN - 1388-6150

IS - 3

ER -