Interactions of electronically excited copper(II)-porphyrin with DNA: resonance Raman evidence for the exciplex formation with adenine and cytosine residues

Article Abstract:

Molecular complexes between the water-soluble cationic metalloporphyrin copper (II)-tetrakis porphyrin (CuP) and a series of DNA-model single-stranded homopolynucleotides is studied by resonance Raman spectroscopy as concerns their ability to form exciplexes under high-power nanosecond laser irradiation. The results suggest that besides thymine and uracil, adenine and cystosine can serve as axial ligands for photoexcited CuP, in complexes with some single-stranded deoxyribopolynucleotides.

Copper

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SERS and tunneling spectroscopy investigation of iron-protoporphyrin IX adsorbed on a silver tip

Article Abstract:

Iron-protoporphyrin IX adsorbed on a scanning tunneling microscopy silver tip is investigated by combining surface enhancement Raman (SERS) and tunneling spectroscopies down to single molecule regime. The results reveal the occurrence of a strong electronic coupling between the molecule and the metal, which may help in explaining the dynamical phenomena at the molecule-metal interface.

Adsorption, Tunneling spectroscopy

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Geometry and solvent-polarity dependences of the relaxation dynamics of the singlet excited state of center-to-edge phosphorus(V) porphyrin heterodimers

Article Abstract:

The contribution of the charge-transfer (CT) state to the decay process of the singlet excited state of center-to-edge phosphorous (V) porphyrin heterodimers (p- and m-Pm-PCl2) is investigated. The results have shown that m-Pm-PCl2 is an effective component in the supramolecular system for fast and sequential electron transfer via the CT state.

All Other Basic Inorganic Chemical Manufacturing, Phosphorus & Compounds, Charge transfer, Phosphorus compounds, Relaxation (Nuclear physics)

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