MICROSECOND-RESOLVED XAFS OF THE TRIPLET EXCITED-STATE OF PT2(P2O5H2)4(4-)

被引：70

作者：

THIEL, DJ

LIVINS, P

STERN, EA

LEWIS, A

机构：

[1] UNIV WASHINGTON,DEPT PHYS,SEATTLE,WA 98195

[2] HEBREW UNIV JERUSALEM,DIV APPL PHYS,JERUSALEM,ISRAEL

来源：

NATURE | 1993年 / 362卷 / 6415期

关键词：

D O I：

10.1038/362040a0

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

LITTLE is known about the excited-state structures of most inorganic compounds. Time-resolved resonance Raman and time-resolved infrared spectroscopies can provide only indirect structural information for short-lived excited species in solution at room temperature. Time-resolved X-ray diffraction' has the potential to give more direct information, but no excited-state structures have yet been reported; picosecond gas-phase electron diffraction has been proposed recently2, but not yet demonstrated. Here we report a technique that combines the X-ray absorption fine-structure (XAFS) method3 With rapid-flow laser spectroscopy4 to measure structural changes in a solution-phase excited-state transition-metal complex with microsecond resolution. We find that the triplet excited state of Pt2(P2O5H2)44-, with a lifetime of about 4 mus, undergoes a contraction in the Pt-Pt distance of 0.52 +/- 0.13 angstrom relative to the ground state. We anticipate that time-resolved XAFS will have broad applications in chemistry and biology.

引用

页码：40 / 43

页数：4

共 20 条

[1]

BOUDREAUX EA, 1986, INT J QUANTUM CHEM Q, V20, P239

[2] METAL-METAL INTERACTIONS IN BINUCLEAR PLATINUM(II) DIPHOSPHITE COMPLEXES - RESONANCE RAMAN-SPECTRA OF THE 1A1G(D-SIGMA STAR)2 AND 3A2U(D-SIGMA STAR P-SIGMA STAR) ELECTRONIC STATES OF PT2(P2O5H2)44- [J].