Picosecond flash photolysis and spectroscopy: Bis-(4-dimethylaminodithiobenzil)-Ni(II), BDN

✍ Scribed by Douglas Magde; Bruce A. Bushaw; Maurice W. Windsor

• Publisher: Elsevier Science
• Year: 1974
• Tongue: English
• Weight: 821 KB
• Volume: 28
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(74)80069-2

✦ Synopsis

The transient absorption sjicctrum Of an electro&Aly excited dithiene; bis_i4d~ethyl~inodi~~ObemiI)-~i~[),

which we term BDN, 1~~s measured with 10 ps temporal resolution and I: nm wavcIength resolution. For liseries oE "heavy atom" solvents, both the ground state and the excited state spectra remained constant while the &my kinetics of the excited state absorption, as well as the recovery from ground St&e bleaching, varied; the extremevalues were 9 nsin benzene and 0.22 no in iodoethane. The excited state spectrum can be plausibly fitted by a particular one electron ~ansition between pieviously calculated molecular orbitals, although'this clearly does not prove that these orbit& provide the best description for the excited states. Similarly, present data do not determine $ unique d,ecay scheme. We comment on three possibilities within the framework of the ground flnte virtual orbital picture.

We are aware of no previous direct detection of exited states of such nickel complexes either in absorption or in emission. We conclude that our recently developed techniques wiil be generaI!y applicable in probing the photodynamics of presently intractable molecular species. The significance of our data for laser mode-locking is discussed.

Volume 28, number 2

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