《Tryptanthrin derivatives as efficient singlet oxygen sensitizers》 was written by Pinheiro, Daniela; Pineiro, Marta; Seixas de Melo, J. Sergio. Quality Control of 1,2-DiiodoethaneThis research focused ontryptanthrin derivative singlet oxygen sensitizer; Fluorescence; Singlet oxygen sensitization; Tryptanthrin; Tryptanthrin derivatives. The article conveys some information:
Halogenated tryptanthrin and aminotryptanthrin were synthesized from indigo or isatin precursors. Dibromo- and tetrabromo-tryptanthrin were obtained from indigo dyes following green chem. procedures, through microwave-assisted synthesis in mild oxidation conditions. Spectral and photophys. properties of the compounds, including quant. determination of all the different deactivation pathways of S1 and T1, were obtained in different solvents and temperatures The triplet state (T1) has a dominant role on the photophys. properties of these compounds, which is further enhanced by the halogens at the fused-Ph rings. Substitution with an amino group, 2-aminotryptanthrin (TRYP-NH2), leads a dominance of the radiative decay channel. Moreover, with the sole exception of TRYP-NH2, S1 ∼ ∼ > T1 intersystem crossing constitutes the dominant route, with internal conversion playing a minor role in the deactivation of S1 in all the studied derivatives In agreement with tryptanthrin, emission of the triplet state of tryptanthrin derivatives (with exception of TRYP-NH2), was observed together with an enhancement of the singlet oxygen sensitization quantum yield: from 70% in tryptanthrin to 92% in the iodine derivative This strongly contrasts with indigo and its derivatives, where singlet oxygen sensitization is found inefficient. In the experimental materials used by the author, we found 1,2-Diiodoethane(cas: 624-73-7Quality Control of 1,2-Diiodoethane)
1,2-Diiodoethane(cas: 624-73-7) is one of organic iodides. The carbon-iodine bond is weaker than other carbon-halogen bonds due to the poor electronegative nature of the iodine atom. In general, organic iodides are light-sensitive and turn yellow during storage, owing to the formation of iodine. Organic iodides can be alkyl, alkenyl, or alkynyl, and all of them are very reactive toward with many kinds of nucleophiles.Quality Control of 1,2-Diiodoethane
Referemce:
Iodide – Wikipedia,
Iodide – an overview | ScienceDirect Topics – ScienceDirect.com