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Steady-state and time-resolved emission spectra were measured to study the relaxation of all-trans retinoic acid (ATRA) from its excited-states in a number of solvents. We found that the time-resolved emission signal is composed of three decay components arising from three different excited-states. The ultrafast component that is shorter than 80fs is dominant at λ≤500nm, whereas the intermediate component...
Time-resolved emission techniques were employed to study the pressure effect on curcumin's luminescence in several aliphatic alcohols. We found that the hydrostatic pressure of up to 2GPa affects the decay rate of curcumin emission in the same way it affects the protonated form of many photoacids. We therefore propose that curcumin, which has two phenol groups, is a strong photoacid. Strong photoacids...
Two new rearranged spongian diterpenes designated omriolide A and B were isolated from the southern Kenyan sponge Dictyodendrilla aff. retiara collected at Wasini Is., Shimoni Channel. Omriolide A possesses an octalin linked to a unique trioxatricyclo[5.2.1.0 4,10 ]decane ring system, forming a tricyclic ‘cap’. Omriolide B comprised a tricyclo[5.4.0.0 2,4 ]undecane linked to a dioxabicyclo[3...
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