Synthesis of redox sensitive dyes based on combination of long wavelength emitting fluorophores ad nitroxides

Bognár, Balázs and Jekő, József and Kálai, Tamás and Hideg, Kálmán (2010) Synthesis of redox sensitive dyes based on combination of long wavelength emitting fluorophores ad nitroxides. Dye and pigments, 87 (3). pp. 218-224. ISSN 0143-7208

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Abstract

New, nitroxide-fluorophore acceptor-donor compounds were synthesized based on long wavelength (570e790 nm) emitting 9-diethylamino-5H-benzo[a]phenoxazin-5-one, 4,4-difluoro-4-bora-3a,4adiaza- s-indacene and metal-ligand complex fluorophores. The fluorophores and nitroxides were linked via a robust C]C bond. The steady-state spectral properties of the new donor-acceptor compounds and their diamagnetic (sterically hindered amine) derivatives were studied. Titration of nitroxides with ascorbic acid sodium salt to diamagnetic N-hydroxy compounds resulted in fluorescence enhancement. The Ru-complex modified with nitroxide exhibited fluorescence increase and electron paramagnetic resonance band broadening upon B-deoxyribonucleic acid addition providing evidence of binding with B-deoxyribonucleic acid. �

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