Broad-Band NIR Transient Absorption Spectroscopy of an "All-Carbon"-Bridged Bimetallic Radical Cation Complex

Josef Gluyas, Alexandre Sobolev, E.G. Moore, Paul Low

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17 Citations (Scopus)
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Abstract

© 2015 American Chemical Society. Broad-band near-infrared (NIR) transient absorption (TA) spectroscopy has been used for the first time to probe an all-carbon-bridged organometallic radical cation complex. The compound [{Ru(PPh3)2Cp}2(μ-C≡CC≡C)]+ ([1]+) was investigated in dichloromethane and acetonitrile solutions, using laser excitation at 700, 800, 900, and 1000 nm; these wavelengths span the NIR absorption band envelope. The resulting TA spectra were found to be independent of excitation wavelength and consist of an excited state absorption feature with a peak at ca. 1150 nm and the corresponding bleach signal of the ground-state NIR absorption band, which both decay to 0 over the 50 ps time window investigated. Data were analyzed globally and fit collectively for each of the four different excitation wavelengths, with the resulting best fit to a biexponential decay function indicating two processes with slightly different time scales of ca. 1.5 and ca. 9.0 ps involved in the relaxation to the ground state. (Figure Presented).
Original languageEnglish
Pages (from-to)3923-3926
JournalOrganometallics
Volume34
Issue number16
DOIs
Publication statusPublished - 5 Aug 2015

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