Chapter 11, Problem 11G.3DQ

Interpretation Introduction

Interpretation:

Whether the addition of iodide ion to the solution likely to increase or decrease the efficiency of phosphorescence of chromophore present in the aqueous solution has to be predicted.

Concept introduction:

The process of fluorescence involves the excitation of electrons from the singlet state $\left(S=0\right)$ to the singlet state $\left(S=0\right)$.  The process of phosphorescence involves the excitation of electrons from the singlet state $\left(S=0\right)$ to the triplet state $\left(S=1\right)$.  The process of phosphorescence takes more time than the process of fluorescence because spin inversion takes place in phosphorescence.