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. 2016 Aug 30;6:32152. doi: 10.1038/srep32152

Table 1. The primary optimized bond lengths (Ǻ) and bond angles (°) of the hydrogen bond groups for the normal form and tautomeric forms (K1, K2) of the quercetin in the S0 and S1 state.

  Normal form K1 form K2 form
S0 S1 S0 S1 S0 S1
O1-H2 0.986 1.001 0.969 0.971 1.770
O3-H4 0.976 0.983 1.809 2.013 0.969
O5-H2 1.746 1.663 1.934 1.888 0.987
O5-H4 2.022 1.984 1.000 0.979 2.155
δ(O1-H2-O5) 148.2° 152.6° 140.5° 142.0° 146.5°
δ(O3-H4-O5) 117.9° 120.1° 124.0° 116.9° 113.1°