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Noticeable mild is an plentiful resource of power. whereas the conversion of sunshine strength into electricity (photovoltaics) is very constructed and commercialized, using obvious mild in chemical synthesis is much much less explored. Chemical photocatalysts that mimic rules of organic photosynthesis make the most of seen mild to force endothermic or kinetically hindered reactions. This paintings summarizes in sixteen chapters the state-of-the-art and the demanding situations of this rising destiny know-how.
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Extra info for Chemical Photocatalysis
This section will take a closer look at some of the important concepts discussed earlier. First, we will discuss the transition probabilities between various states of the photocatalyst or the reactive pair formed by the photocatalyst and the reactant. Within the framework of the Born–Oppenheimer approximation these transition probabilities can be factored, and the various terms can be interpreted in 32 | Bernhard Dick terms of several selection rules. A second concept concerns the representation of the molecular electronic states in terms of molecular orbitals (MOs).
E. orbitals 67 and 68 are the HOMO and LUMO, respectively. In the electronically excited singlet and triplet states both orbitals are singly occupied. In the radical cation only the HOMO is occupied by a single electron, whereas in the radical anion the HOMO is doubly filled and the LUMO contains one electron. This is indicated by the orbital diagram next to each molecular state in the Jablonski diagram. With the exception of the excited singlet state, all these states can be optimized with the ansatz of a single SAC.
In summary, chemical reactions in the electronic ground state can be represented by a one-dimensional path on the ground state PES which passes through three points, from one minimum over the saddle point to another minimum. In contrast to this, photochemical reactions proceed on two PESs. Since electronic excitation might drastically change the bonding properties, the minima on the excited state PES are usually at quite different geometries than those of the electronic ground state. At the end of a photochemical reaction the molecule has to be back in the electronic ground state.
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