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- W2019903504 abstract "Abstract Intercalative binding of the cationic 5,10,15,20-tetrakis(4- N -methylpyridyl) porphyrin (H 2 TMpyP 4+ ) at 5′CG3 and 5′GC3′ sequences in [d(TACGTA)] 2 and [d(TAGCTA)] 2 hexadeoxyribonucleotides has been monitored through porphyrin ground-state and transient triplettriplet absorption, steady-state and time-resolved fluorescence as well as resonance Raman scattering. The porphyrin intercalation results in large red shifts and hypochromicity of the Soret absorption band. Charge-transfer processes between guanine residues and intercalated porphyrins, leading to an efficient quenching of the porphyrin S 1 excited singlet state, occur at both 5′CG3′ and 5′GC3′ sites. However, not all of the intercalated molecules are involved in these charge-transfer processes. Oxygen accessibility to intercalated porphyrins is practically the same for both sequences, resulting in rate constants of porphyrin triplet-state quenching by oxygen of 0.12 × 10 9 and 0.14 × 10 9 (M s) −1 for 5′CG3′ and 5′GC3′ sites, respectively. Minor parts (11 and 16% for [d(TACGTA)] 2 and [d(TAGCTA)] 2 , respectively) of the porphyrin molecules are externally bound to hexamers, resulting in a higher oxygen accessibility ( k q = 0.5 × 10 9 and 0.6 × 10 9 (M s) −1 for 5′CG3′ and 5′GC3′ sites, respectively). The photophysical properties of bound H 2 TMpyP 4+ molecules in hexamers and the local polarity at the binding sites are close to those found at the corresponding binding sites in polynucleotides. The resonance Raman spectra of the H 2 TMpyP 4+ porphyrin moieties in both complexes mainly bear features characteristic of an intercalative binding mode, but there is also clear evidence for the existence of groove-bound complexes." @default.
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- W2019903504 title "Binding of the cationic 5,10,15,20-tetrakis(4-N-methylpyridyl) porphyrin at 5′CG3′ and 5′GC3′ sequences of hexadeoxyribonucleotides: triplettriplet transient absorption, steady-state and time-resolved fluorescence and resonance Raman studies" @default.
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- W2019903504 doi "https://doi.org/10.1016/s1011-1344(98)00162-6" @default.
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