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The best model nitrile sensitizer is4-(dicyanomethylene)-2-methyl-6-(4-dimethylaminostyryl)-4H-pyran (DCM, Fig. 2), which bears both strong electron-withdrawing nitriles and an electron-donating dimethylaminogroup. The dipolar structure of DCM provides directionalityof the electronic orbitals in the excited state. This direc-tionality should improve the direct, “one-step” electroninjection from the ground state of the dye to the CB of TiO
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An et al. (2011) studied this question.
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