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Important bond length (Å) and bond angle (°) data related to the hydrogen bond of HBT-Enol1, HBT-Keto in the ground state and excited state.
| HBT-Enol1 | HBT-Keto | |||
|---|---|---|---|---|
| S0 | S1 | S0 | S1 | |
| O-H1 | 0.994 | 1.017 | 1.633 | 1.871 |
| H1⋯N | 1.718 | 1.638 | 1.053 | 1.024 |
| δ(O-H1⋯N) | 147.2 | 150.2 | 139.4 | 130.9 |
