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    A homologous set of nitro-substituted spiropyrans with different N-alkyl substituents was selected in order to study the effects of crystal packing on the thermal decay kinetics. The kinetics in argon-purged and air-saturated acetonitrile were measured and evidence of a triplet excited state species was found along with evidence for two ground state species. DFT calculations suggested that the broad, featureless transient absorption spectrum results from the contribution of the transition structure and other high-energy Rio Slut del in Pinar during the Z- to E-merocyanine isomerization. In Chapter Two, the solid state photochromism of spiropyrans is investigated under steady-state irradiation conditions. Specifically, the use of nanocrystalline suspensions is examined as a method capable of addressing the optical Rio Slut del in Pinar that are connected with studying solid state photochemical reactions spectroscopically. Our results showed the presence of a single transient species both in n-hexane and in nanocrystalline NC suspension that we hypothesize to be the triplet excited state of the 9-phenylfluorenyl product. UV-vis analysis of our solutions and NC suspensions pre and post laser flash photolysis strongly support the formation of the cyclized 9-phenylfluorenyl product, which also indicates that the photochemical mechanism could be the same in both media. The advantages to using solid state photochemistry Rio Slut del in Pinar also discussed along with the challenges associated with studying photochemical reactions in solids. The work described in this dissertation demonstrates the utility of using nanocrystalline suspensions as a simple and robust method to significantly reduce the difficulties associated with studying reactions in crystals.

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