Investigations of energy transfer from some diolefinic laser dyes to Rhodamine 110

7-Hydroxy-4-methyl-8-(4′-methylpiperazine-1′-yl)methyl coumarin: An efficient probe for fluorescence resonance energy transfer to a bioactive indoloquinolizine system

“…It points to the absence of any detectable groundstate complex of the donor-acceptor pair in the solution [29][30][31]. The fluorescence emission spectrum of the mixture of donor and acceptor did not show any additional new broad peak at longer wavelengths which is an evidence of the absence of exciplex formation between the excited donor and the acceptor molecules.…”

“…The fluorescence emission spectrum of the mixture of donor and acceptor did not show any additional new broad peak at longer wavelengths which is an evidence of the absence of exciplex formation between the excited donor and the acceptor molecules. Thus, the decrease in fluorescence intensity of the donor with increasing acceptor concentration indicates non-radiative energy transfer between the excited donor and the acceptor [30,31]. Furthermore, the fluorescence excitation profile monitoring at 455 nm (emission maximum in the presence of donor and acceptor molecules) shows that besides the S 0 -S 1 transition of AODIQ (l max $420 nm), a prominent band with l max $320 nm corresponding to the HMMC absorption occurs (Fig.…”

Fluorescence resonance energy transfer from tryptophan in human serum albumin to a bioactive indoloquinolizine system

“…Furthermore, the fluorescence spectrum of the mixture of donor and acceptor did not show any additional new band other than the individual emission bands of the two components. These factors taken together negate the formation of any permanent ground-state complex between the donor-acceptor pair in the solution [25][26][27] as well as the formation of exciplex between the excited donor and the unexcited acceptor molecules. Thus the decrease in the fluorescence intensity of the donor with increasing acceptor concentration indicates a non-radiative energy transfer between the excited donor and the unexcited acceptor.…”

“…Thus the decrease in the fluorescence intensity of the donor with increasing acceptor concentration indicates a non-radiative energy transfer between the excited donor and the unexcited acceptor. 26,27 Furthermore, the excitation profile monitoring the emission of AODIQ (at 488 nm) shows that in the presence of HSA, besides the S 0 → S 1 transition of AODIQ (λ exc max ≈ 420 nm), a band with λ exc max ≈ 280 nm (corresponding to the tryptophan) appears. This provides strong evidence for the occurrence of Förster-type resonance energy transfer from the tryptophan moiety (donor) present in HSA to the AODIQ molecule (acceptor).…”

Hydrophobicity effect on interactions between organic molecules in nanocages of surfactant micelle

“…It is important to note that additional bands besides absorption bands of DiOC 18 and DiI were not recorded in absorption spectra of the dye mixture. This precluded formation of donor-acceptor complexes in the ground state [15][16][17]. Additional long-wavelength bands were not recorded also in luminescence spectra of the dye mixture in SDS micelles.…”