High Pulse Energy Flashlamp Pumpable Laser Dyes
Abstract
The class of laser dye known as 4PyMPO was given an expanded fluorophor by substitution of a biphenylene for the phenylene group. Neither the derived quaternary salt or zwitterion had a higher extinction coefficient, quantum yield, or bathochromic shift of absorption from that of the parent compound. Replacement of the methoxy 'M' by julolidino was not achieved. In 2- (4'-methoxy-4-biphenyl)-1-propylbenzimidazole, the methanesulfonate acid salt was no higher in quantum yield than the methanesulfonate quat., indicating no steric hindrance to planarity in the excited state. Addition of a phenylene group, again, did not improve the fluorescence properties. A symmetrical version with benzimidazolium ions at both ends is being prepared. Synthesis of a bridged quaterphenyl with stilbenylmethyl groups as potential intramolecular triplet state quenchers is one step from the target molecule. Synthesis of a high-energy dye related to the most effective bridged sexiphenyls known by replacement of benzene rings B and E by furan rings is one step from the target molecule. Keywords: Laser dye flashlamp-pumped, Triplet-state, Optics, Photostable oligophenylene, Fluorene, Furan oxazole, High pulse energy, Benzimidazole, Benzimidazolium ion, Quaternary salt, Pyridinium salt, Zwitterion, 4PyMPO, Julolidine, Auxofluor fluorescence, Quantum yield, Extinction coefficient.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 09, 1990
- Accession Number
- ADA223075
Entities
People
- Joel M. Kauffman
- John Novinski