The ground state of ethene is \'Ag. Given the symmetries of the pi and pi orbita
ID: 918686 • Letter: T
Question
The ground state of ethene is 'Ag. Given the symmetries of the pi and pi orbitals of ethene in Exercise 7(c), find the symmetry species of the excited state formed by exciting an electron from the pi orbital to the pi 0 orbital. Will the state be a singlet or a triplet or are both possible? Note that the direct product of any representation with itself always contains the totally symmetric representation. As used here, the term "contains" means that the direct product is either equal to the totally symmetric representation or it decomposes into a sum of representations at least one of which is the totally symmetric representation. This property is important for what comes next.Explanation / Answer
symmetry is found in species of the exicited state formed by exciting an electron from the pi orbital to the pi* orbital.
It can be seen in compounds like B2, Ne2, O2
The state is commonly found in compounds in which the lowest energy transition is (excited singlet state).
short lived and less suceptable to deactivation than the triplet state.
so bothe singlet and Triplet states are possible.
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