UV-VISIBLE ABSORBENCY SPECTROSCOPY OF ORGANIC PROBES IN SUPERCRITICAL WATER

被引：121

作者：

BENNETT, GE ^{[1
]}

JOHNSTON, KP ^{[1
]}

机构：

[1] UNIV TEXAS, DEPT CHEM ENGN, AUSTIN, TX 78712 USA

来源：

JOURNAL OF PHYSICAL CHEMISTRY | 1994年 / 98卷 / 02期

关键词：

D O I：

10.1021/j100053a017

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

UV-visible spectra of organic probes are reported in supercritical water (SCW) for the first time up to 440 degrees C and 5000 psia. Solvatochromic shifts in the pi-pi* absorbance band of benzophenone are compared with those of the n-pi* band of acetone to characterize the dipolarity, polarizability, and hydrogen bond donor strength of water. In the near-critical region (0.5 < rho(r) < 1.5), physical and hydrogen-bonding interactions augment the density of water about each probe, relative to the bulk density. At 380 OC, hydrogen bonding persists at a density of only 0.1 g/mL but rapidly disappears at lower densities. Spectroscopic measurements of interactions between SCW and organic solutes at the molecular level provide new insights into solvent effects on chemical reactions in SCW.

引用

页码：441 / 447

页数：7