A Dark Excited State of Fluorescent Protein Chromophores, Considered as Brooker Dyes

Details A Dark Excited State of Fluorescent Protein Chromophores, Considered as Brooker Dyes A Dark Excited State of Fluorescent Protein Chromophores, Considered as Brooker Dyes

2010-01-15

arxiv.org/abs/1001.2593v1

Physics

Chemical Physics

This paper has been submitted for publication in Chemical Physics Letters

Scientific paper

The green fluorescent protein (GFP) chromophore is an asymmetric monomethine dye system. In the resonance color theory of dyes, a strong optical excitation arises from interactions of two valence-bond structures with a third, higher structure. We use correlated quantum chemistry to show that the anionic chromophore is a resonant Brooker dye, and that the third structure corresponds to a higher stationary electronic state of this species. The excitation energy of this state should be just below the first excitation energy of the neutral form. This has implications for excited state mechanism in GFPs, which we discuss.

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