Triplet quantum yield determination by photosensitized oxygenation in the presence of heavy atom additives: Rhodamine B in methanol

Relative rates of heavy-atom-enhanced photosensitized ¹O₂-reactions may be used to determine φ^o_T of sensitizers in heavy-atom-free solutions. φ^o_T = 0.12 ± 0.02 is obtained for a 5·10^?5 M methanolic solution of Rhodamine B .     

13C NMR spectra of diazastilbenes. II—Torsion angles of trans-pyridinalanilines and trans-benzylideneaminopyridines

The torsion angles of trans-pyridinalanilines and trans-benzylideneanilines were derived from the chemical shifts of the para-carbon atoms. The N-torsion angle is between 33 and 59°. For the C-torsion angle, a value of approximately 10° is obtained for the benzylideneaminopyridines and the C-torsion angle for the pyridinalalines is estimated to be in the same range.