Energy dispersive xafs: Characterization of electronically excited states of copper(I) complexes

Moniek Tromp, Andrew J. Dent, Jon Headspith, Timothy L. Easun, Xue Zhong Sun, Michael W. George, Olivier Mathon, Grigory Smolentsev, Michelle L. Hamilton, John Evans

Research output: Journal PublicationArticlepeer-review

38 Citations (Scopus)

Abstract

Energy dispersive X-ray absorption spectroscopy (ED-XAS), in which the whole XAS spectrum is acquired simultaneously, has been applied to reduce the real-time for acquisition of spectra of photoinduced excited states by using a germanium microstrip detector gated around one X-ray bunch of the ESRF (100 ps). Cu K-edge XAS was used to investigate the MLCT states of [Cu(dmp) 2]+ (dmp =2,9-dimethyl-1,10-phenanthroline) and [Cu(dbtmp)2]+ (dbtmp =2,9-di-n-butyl-3,4,7,8-tetramethyl- 1,10-phenanthroline) with the excited states created by excitation at 450 nm (10 Hz). The decay of the longer lived complex with bulky ligands, was monitored for up to 100 ns. DFT calculations of the longer lived MLCT excited state of [Cu(dbp)2]+ (dbp =2,9-di-n-butyl-1,10-phenanthroline) with the bulkier diimine ligands, indicated that the excited state behaves as a Jahn-Teller distorted Cu(II) site, with the interligand dihedral angle changing from 83 to 60 as the tetrahedral coordination geometry flattens and a reduction in the Cu-N distance of 0.03 Å.

Original languageEnglish
Pages (from-to)7381-7387
Number of pages7
JournalJournal of Physical Chemistry B
Volume117
Issue number24
DOIs
Publication statusPublished - 20 Jun 2013
Externally publishedYes

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

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