caa a22 4500 469056630 CHVBK 20180323132845.0 cr unu---uuuuu 170328e19920901xx s 000 0 eng 10.1163/156856792X00146 doi (NATIONALLICENCE)springer-10.1163/156856792X00146 Fluorescence of phthalocyanines: Emission from an upper excited state [Elektronische Daten] [D. Chahraoui, P. Valat, J. Kossanyi] The weak (φf < 103) fluorescence at around 430 nm of the S2 upper excited singlet state of metal-free phthalocyanine and metallophthalocyanines is presented. Polarization measurements indicate that the emission is short-lived (< 800 ps) contrary to the intense (φf > 0.3) normal emission at around 700 nm originating from S1 and having a lifetime in the 4.1 to 10.6 ns range, depending on the solvent. The short wavelength emitting S2 excited state has been populated by a two photon absorption process using the excitation light at 695 nm of a pulsed ruby laser. This process is shown not to involve the triplet state but the following stepwise two photon absorption process: . Springer, 1992 Chahraoui D. C.N.R.S., 2-8 rue H. Dunant, 94320, Thiais, France aut Valat P. C.N.R.S., 2-8 rue H. Dunant, 94320, Thiais, France aut Kossanyi J. C.N.R.S., 2-8 rue H. Dunant, 94320, Thiais, France aut Research on Chemical Intermediates Springer Netherlands 17/3(1992-09-01), 219-232 0922-6168 17:3<219 1992 17 11164 https://doi.org/10.1163/156856792X00146 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1163/156856792X00146 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Chahraoui D. C.N.R.S., 2-8 rue H. Dunant, 94320, Thiais, France aut NATIONALLICENCE 700 1- Valat P. C.N.R.S., 2-8 rue H. Dunant, 94320, Thiais, France aut NATIONALLICENCE 700 1- Kossanyi J. C.N.R.S., 2-8 rue H. Dunant, 94320, Thiais, France aut NATIONALLICENCE 773 0- Research on Chemical Intermediates Springer Netherlands 17/3(1992-09-01), 219-232 0922-6168 17:3<219 1992 17 11164 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer