Ab initioinvestigation of the structures and energies of spiropyran and merocyanine isomers
The structures and energies of a set of spiropyrans and merocyanines – BIPS [1 ,3 ,3 -trimethylspiro[2H-1-benzopyran-2,2 - indoline], 6-nitroBIPS, and 6,8-dinitroBIPS – are calculated using density functional theory and second-order Møller–Plesset methods. The relative energies of all possible merocyanine isomers in the ground state are determined systematically at a uniform level of theory. Solvent contributions, which have been found to be significant, are also included. Ke
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