Triplet-triplet absorption and polarization spectra of some syn-dioxabimanes

The triplet-triplet (T-T) absorption and polarization, singlet-singlet (S-S) absorption, and fluorescence spectra of syn-(methyl, hydrogen), syn-(tetramethylene), syn-(methyl, chloro)bimane, as well as those of syn-(phenyl, chloro), syn-(methyl, phenyl), and syn-(benzo)bimane were measured as part of a study of the factors that presumably control the laser action properties of the syn-bimanes.The syn-bimanes exhibit T-T absorption in the violet-blue/green portion of the spectrum and show two differently polarized transitions. A red shift in the S-S and T-T transition bands for a phenylbimane is dependent on the position of substitution (R₁ or R₂) and on the polarization of the bands. As substitution (R₁) along the long axis reduces T-T absorption over the fluorescence spectral region there is an improvement in laser action properties.Photoselection spectroscopy is briefly reviewed. Spectral arrangements and their polarizations (lasing constellations) of low-energy electronic transitions (S-S, T-T and fluorescence) that yield low T-T absorption within the fluorescence (laser action) spectral region and their correlation with molecular structure substituent effects are discussed.anti-Bimanes are proposed as possible phosphorescence laser materials.