"0022-2860" . "Oxygen effects on tetrapropylporphycene near-infrared luminescence kinetics" . "Oxygen effects on tetrapropylporphycene near-infrared luminescence kinetics"@en . "1044" . . "95103" . . . . "July 2013" . . "NL - Nizozemsko" . . "Oxygen effects on tetrapropylporphycene near-infrared luminescence kinetics" . "000320635200046" . . . "Tetra-propyl-porphycene (TPrPo) in solution has been studied by means of time-and spectral-resolved near-infrared (NIR) luminescence spectroscopy. The NIR luminescence kinetics exhibits surprising dependence on oxygen concentration. There is a clearly visible long-lived (microsecond range) rise-section in biexponential kinetics at broad NIR spectral range of 800-1100 nm for lowered oxygen concentrations. The rise-section is not present in nitrogen-saturated samples and it also disappears after addition of singlet oxygen (O-1(2)) physical quencher DABCO, which means that the effect is O-1(2)-mediated. Kinetics of TPrPo delayed fluorescence detected around 650 nm possess a similar rise-decay character in microsecond range. Simultaneous measurements of O-1(2) phosphorescence kinetics, triplet-triplet transient absorption, and delayed fluorescence have provided additional information about the phenomenon. It is proposed that TPrPo shows a singlet oxygen-sensitized delayed fluorescence which extends to near-infrared where it is strong enough to override the phosphorescence emission." . "Journal of Molecular Structure" . "[B3AB12F9BA2F]" . . "H\u00E1la, Jan" . "3"^^ . . . . . "P(GD202/09/H041), S" . "11320" . "4"^^ . . "RIV/00216208:11320/13:10173449" . . "Rise-decay kinetics; Delayed fluorescence; Phosphorescence; Singlet oxygen; Porphyrin; Porphycene"@en . "5"^^ . . . . . . "RIV/00216208:11320/13:10173449!RIV14-GA0-11320___" . "10.1016/j.molstruc.2012.12.029" . . "D\u011Bdic, Roman" . . "Oxygen effects on tetrapropylporphycene near-infrared luminescence kinetics"@en . "Tetra-propyl-porphycene (TPrPo) in solution has been studied by means of time-and spectral-resolved near-infrared (NIR) luminescence spectroscopy. The NIR luminescence kinetics exhibits surprising dependence on oxygen concentration. There is a clearly visible long-lived (microsecond range) rise-section in biexponential kinetics at broad NIR spectral range of 800-1100 nm for lowered oxygen concentrations. The rise-section is not present in nitrogen-saturated samples and it also disappears after addition of singlet oxygen (O-1(2)) physical quencher DABCO, which means that the effect is O-1(2)-mediated. Kinetics of TPrPo delayed fluorescence detected around 650 nm possess a similar rise-decay character in microsecond range. Simultaneous measurements of O-1(2) phosphorescence kinetics, triplet-triplet transient absorption, and delayed fluorescence have provided additional information about the phenomenon. It is proposed that TPrPo shows a singlet oxygen-sensitized delayed fluorescence which extends to near-infrared where it is strong enough to override the phosphorescence emission."@en . "Scholz, Marek" . "http://dx.doi.org/10.1016/j.molstruc.2012.12.029" . "Nonell, Santi" .