Res. Chem. Intermed.
, Vol. 32, No. 8, pp. 767–776 (2006)
Also available online - www.brill.nl/rci
Spectroscopic properties of anion radicals studied using
VAISHALI SAMANT, AJAY K. SINGH, TULSI MUKHERJEE
and DIPAK K. PALIT
Radiation and Photochemistry Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
Received 16 September 2005; accepted 7 February 2006
Abstract—The anion radicals of benzophenone, amino derivatives of benzophenone, ﬂourenone, furil
and antharcene have been generated by pulse radiolysis in acetonitrile solution and their spectroscopic
and kinetic properties have been characterized. The G-value for generation of anion radicals in
acetonitrile has been measured to be 1.01 ± 0.1 per 100 eV. We have also investigated the electron-
transfer reactions from anion radicals of one kind of solutes to the ground state of another solute.
This study has demonstrated that pulse radiolysis can be a useful technique for generation and
characterization of anion radicals and for studying electron-transfer reactions using acetonitrile as
Keywords: Anion radical; pulse radiolysis; electron transfer.
Pulse radiolysis is an excellent and useful technique, which is complementary to
ﬂash photolysis, for selective generation and investigation of ketyl radicals, anion
radicals and cation radicals, as well as the triplet states of organic molecules under
suitable experimental conditions [1–9]. Radiation chemistry of water has been
extensively studied using this technique and the latter has been used for generation
of anion and ketyl radicals, as well as oxidized radical species of organic solutes in
aqueous medium . In the case of the solutes which are sparingly soluble in water,
mixed aqueous-alcoholic solvents have also been used to dissolve such solutes and
their radiation chemistry has been investigated extensively [9, 10]. This technique
has also been successfully applied to generate and study the properties of the cation
radical species of organic solutes in chlorinated solvents [7, 8].
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