Direct spectroscopic observation of singlet oxygen emission at 1268 nm excited by sensitizing dyes of biological interest in liquid solution | Zendy

Ahsan U. Khan | Zendy; Michael Kasha | Zendy

Open Access

Direct spectroscopic observation of singlet oxygen emission at 1268 nm excited by sensitizing dyes of biological interest in liquid solution

Author(s) -

Ahsan U. Khan,

Michael Kasha

Publication year - 1979

Publication title -

proceedings of the national academy of sciences

Language(s) - English

Resource type - Journals

eISSN - 1091-6490

pISSN - 0027-8424

DOI - 10.1073/pnas.76.12.6047

Subject(s) - singlet oxygen , methylene blue , chemistry , photochemistry , oxygen , excited state , solvent , fluorescence , lead sulfide , analytical chemistry (journal) , materials science , optoelectronics , optics , organic chemistry , physics , photocatalysis , nuclear physics , quantum dot , catalysis

The direct observation of dye-photosensitized 1268-nm emission of the1 Δg →3 Σg transition of molecular oxygen in liquid solution at room temperature is reported. Singlet oxygen was photosensitized by UV excitation of perfluorobenzophenone in fluorocarbon solvent, by 3,4-benzpyrene and hematoporphyrin in carbon tetrachloride, and by methylene blue in water. Also reported is the development of an extremely sensitive near-infrared spectrophotometer that uses a thermoelectrically cooled lead sulfide detector, optimized optics, and a boxcar integrator as a data processor.

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