Local density augmentation of excited 1-(dimethylamino)naphthalene in supercritical water

Kimitaka Minami, Takafumi Aizawa, Mitsuhiro Kanakubo, Yusuke Hiejima, Hiroshi Nanjo, Richard L. Smith

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Local density around excited 1-(dimethylamino)naphthalene in supercritical water was measured by peak shift of fluorescence spectrum from 8 to 37 MPa at 380 °C. Local density augmentation was evaluated by the excess density, which was defined as the difference between the local density and bulk density. Local density augmentation was observed to be lower than the critical density (ρc = 0.32 g cm-3). The excess density exhibited a maximum at about 0.11 g cm-3, which is lower than the critical density. Our results show that excited-state 1-(dimethylamino)naphthalene has strong interactions with water molecules and that local density augmentation occurs even if the solute life time is very short (ca. ns order).

Original languageEnglish
Pages (from-to)206-210
Number of pages5
JournalJournal of Supercritical Fluids
Volume39
Issue number2
DOIs
Publication statusPublished - 2006 Dec

Keywords

  • 1-(Dimethylamino)naphthalene
  • Excited state
  • Fluorescence
  • Local density augmentation
  • Supercritical water

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry

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