TY - JOUR
T1 - Electronic energy transfer from the S2 state of rhodamine 6G
AU - Kaplan, Israel
AU - Jortner, Joshua
N1 - Funding Information:
This research was supported by the US-Israel Binational Science Foundation, Jerusalem, Israel .
PY - 1978/8/15
Y1 - 1978/8/15
N2 - In this paper we present the results of an experimental study of intermolecular electronic energy transfer (EET) from the short-lived Second excited singlet state of rhodamine 6G (R6G) to the ground state of 2,5-bis [5′-tert-butyl-2-benzoxazolyl] thiophene (BBOT). The S2 state of the donor was excited by sequential, time-delayed, two-photon excitation (STDTPE) utilizing the second harmonic and the first harmonic of a mode-locked Nd3+: glass laser, while the EET process was interrogated by monitoring the enhancement of the S1 → S0 fluorescence of BBOT. The enhancement of the fluorescence intensity of BBOT was found to be linear in the energies of the two exciting pulses, and linear in the concentration of the energy acceptor (over the BBOT concentration range of (0.3-7) × 10-5 M), which is in accord with the predictions of the Forster-Dexter mechanism for resonant EET from an ultrashort-lived donor state at low acceptor concentrations. Quantitative measurements of the S2 → S0 fluorescence yield in R6G solution directly excited by STDTPE and of the S1 → S0 fluorescence of BBOT from R6G + BBOT solutions resulting from EET led to the values of YD(S2 → S0) = (2.1 ± 0.5) × 10-6 for the emission quantum yield of the S2 state of R6G and τrD(S2) ≈ 3 × 10-14 s for the lifetime of the metastable S2 state of this molecule.
AB - In this paper we present the results of an experimental study of intermolecular electronic energy transfer (EET) from the short-lived Second excited singlet state of rhodamine 6G (R6G) to the ground state of 2,5-bis [5′-tert-butyl-2-benzoxazolyl] thiophene (BBOT). The S2 state of the donor was excited by sequential, time-delayed, two-photon excitation (STDTPE) utilizing the second harmonic and the first harmonic of a mode-locked Nd3+: glass laser, while the EET process was interrogated by monitoring the enhancement of the S1 → S0 fluorescence of BBOT. The enhancement of the fluorescence intensity of BBOT was found to be linear in the energies of the two exciting pulses, and linear in the concentration of the energy acceptor (over the BBOT concentration range of (0.3-7) × 10-5 M), which is in accord with the predictions of the Forster-Dexter mechanism for resonant EET from an ultrashort-lived donor state at low acceptor concentrations. Quantitative measurements of the S2 → S0 fluorescence yield in R6G solution directly excited by STDTPE and of the S1 → S0 fluorescence of BBOT from R6G + BBOT solutions resulting from EET led to the values of YD(S2 → S0) = (2.1 ± 0.5) × 10-6 for the emission quantum yield of the S2 state of R6G and τrD(S2) ≈ 3 × 10-14 s for the lifetime of the metastable S2 state of this molecule.
UR - http://www.scopus.com/inward/record.url?scp=0000597101&partnerID=8YFLogxK
U2 - 10.1016/0301-0104(78)85020-4
DO - 10.1016/0301-0104(78)85020-4
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AN - SCOPUS:0000597101
SN - 0301-0104
VL - 32
SP - 381
EP - 396
JO - Chemical Physics
JF - Chemical Physics
IS - 3
ER -