Question

Organic chemistry

Effects of green and blue fluroescent dyes were explored in the synthesis of benzopinacol. Dye A quenched the synthesis of benzpinacol and had a blue fluoresent light in the chemilluninescent reaction. Dye B also quenced the synthesis of benzpinacol and gave a green fluorsecence in the chemilluninescent reaction. What can you say about the energy levels of the S1 and T1 states of the 2 dyes? For T1, compare the dyes and benzpinacol and for S1, compare the green and blue dyes.

Answer 1

before answering this question, we should know the elecromagnetic spectrum and answer best can be explained using jabolonski diagram,

first we will explain the roles of dyes in the synthesis of benzpinacol, the role of dyes are quenching or initiating the photoreduction reaction, that is the role of dyes are initiators in this reaction.

from the electromagnetic spectrum we know that as the energy increases, frequency increases and wavelength decreases, this means the shorter wavelength has more energy. (VIBGYOR), The wavelength of blue light is more and hence the energy is more than the green light.

there fore form jabolonski diagram we know that S1 = Fluorescence( Singlet state) and T1= Phoshphorescene

( Triplate state)

for S1 state, we can conclude that , DYE A is more in energy than for dye B, AND FOR

T1 state, DYE A is more in energy than dye B.