Theoretical investigation on the excited state intramolecular proton transfer in Me<sub>2</sub>N substituted flavonoid by the time-dependent density functional theory method<xref rid="cpb_27_5_058201_fn1" ref-type="fn">*</xref><fn id="cpb_27_5_058201_fn1"><label>*</label><p>Project supported by the National Basic Research Program of China (Grant No. 2013CB922204), the National Natural Science Foundation of China (Grant Nos. 11574115 and 11704146), and the Natural Science Foundation of Jilin Province, China (Grant No. 20150101063JC).</p></fn>

Theoretical investigation on the excited state intramolecular proton transfer in Me₂N substituted flavonoid by the time-dependent density functional theory method**

Project supported by the National Basic Research Program of China (Grant No. 2013CB922204), the National Natural Science Foundation of China (Grant Nos. 11574115 and 11704146), and the Natural Science Foundation of Jilin Province, China (Grant No. 20150101063JC).

Yin Hang^{1, 2}, Shi Ying^{1, †}

(color online) Schematics of the MNF structure optimized at S₀ and S₁ states in (a) Enol, (b) Enol*, and (c) Keto* forms, showing hydrogen bond lengths, C atoms (light green), H atoms (white), O atoms (red), and N atoms (blue).