Kinetic Study of Boric Acid-Borate Interchange in Aqueous Solution by 11B NMR Spectroscopy

Koji Ishihara*, Akira Nagasawa, Kimiko Umemoto, Hideaki Ito, Kazuo Saito

*この研究の対応する著者

研究成果: Article査読

51 被引用数 (Scopus)

抄録

Kinetics of interchange between boric acid and tetrahydroxyborate has been studied by the band shape analysis of 11B NMR signals in aqueous solution of pH 8–10 at 20–52 °C and 0.1–250 MPa. The system was analyzed as two-site exchange B(OH)3 ⇌ B(OH)4-. The observed first-order rate constant toward the right (kX) is related to the second-order exchange rate constant (kex) by the equation kX = kexCT[OH-]/(kb + [OH-]), where kb = [B(OH)3][OH-]/[B(OH)4-], and CT is the total concentration of boron. Under the given conditions kex is (2–7) × 106 dm3 mol-1 s-1 and ΔH‡, ΔS‡, and ΔV‡ are 20.1 ± 1.0 kJ mol-1, -55.0 ± 3.1 J mol-1 K-1, and -9.9 ± 0.5 cm3 mol-1, respectively. The activation parameters reflect the transition state forming dimeric [(OH)3B(μ-OH)B(OH)3]-. The results are compared with those of related reactions.

本文言語English
ページ(範囲)3811-3816
ページ数6
ジャーナルInorganic Chemistry
33
17
DOI
出版ステータスPublished - 1994 8月 1

ASJC Scopus subject areas

  • 物理化学および理論化学
  • 無機化学

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