Wavelength-dependent photocycloreversion of the endoperoxides of 1,2,3,4-tetramethylanthracene and 1,2,3,4-tetramethyl-9,10-diphenylanthracene

Add time:08/04/2019    Source:sciencedirect.com

A pronounced, graduated wavelength dependence of the quantum yield Qc of cycloreversion of the endoperoxides (POs) of 1,2,3,4-tetramethylanthracene (TMAPO) and 1,2,3,4-tetramethyl-9,10-diphenylanthracene (TMDPAPO) was observed. A comparison of the excited singlet state energies of the naphthalene chromophore of TMDPAPO with the steps in the graduation of Qc leads to an evaluation of the cycloreversion efficiencies from each of the upper excited singlet states Sn: Ec(S2) = 0.13, Ec(S3) = 0.07 and Ec(S4) = 0.67. These values are compatible with recent results of time-resolved measurements according to which the first C-O bond in PO cycloreversion cleaves within a time domain of about 10−13 s.

We also recommend Trading Suppliers and Manufacturers of 9,10-diphenylanthracene endoperoxide (cas 15257-17-7). Pls Click Website Link as below: cas 15257-17-7 suppliers

Prev:Photochemically induced dynamic nuclear polarization of 9,10- diphenylanthracene endoperoxide
Next:Supramolecular carriers of singlet oxygen: Photosensitized formation and thermal decomposition of endoperoxides in the presence of cyclodextrins)