Abstract
A complex of salmon milt deoxyribonucleic acid (DNA) and the cationic
surfactant cetyltrimethylammonium (CTMA) forms an organic-soluble biomaterial that
can be readily incorporated within an organically modified silane-based xerogel. The
photoluminescence (PL) intensity and excited-state luminescence lifetime of
tris(4,7′-diphenyl-1,10′-phenanathroline) ruthenium(II)
[(Ru(dpp)3]2+, a common O2 responsive
luminophore, increases in the presence of DNA-CTMA within the xerogel. The increase
in the [Ru(dpp)3]2+excited-state lifetime in the presence of
DNA-CTMA arises from DNA intercalation that attenuates one or more non-radiative
processes, leading to an increase in the [Ru(dpp)3]2+
excited-state lifetime. Prospects for the use of these materials in an oxygen sensor
are demonstrated.
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