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Electronic Configuration, Formation and Enthalpy of Activation

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1. Define the following terms.
a. fluorescence
b. phosphorescence
c. chemiluminescence
d. intersystem crossing
2. What is the difference in electronic configuration of a singlet and a triplet state?


2. The solvent used in the preparation of diphenylacetylene (2) is triethylene glycol.
a. Write the structure of triethylene glycol; circle and label each of the functional groups in this molecule.

b. What structural features account for the high boiling point of this solvent?
4. Give a stepwise mechanism showing the base-induced formation of diphenyl- acetylene from meso-stilbene dibromide. Use curved arrows to symbolize the flow of electrons.
6. Why do you think the enthalpy of activation, delta-H ‡, for a syn-periplanar elimination is higher than that for an anti-periplanar elimination?

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1. Define the following terms.
a. fluorescence: Fluorescence is the property of some atoms and molecules to absorb light at a particular wavelength and to subsequently emit light of longer wavelength after a brief interval, termed the fluorescence lifetime
b. phosphorescence: The process of phosphorescence occurs in a manner similar to fluorescence, but with a much longer excited state lifetime.
c. chemiluminescence: Chemiluminescence is the generation of electromagnetic ...

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