Stepwise Hydration Switches Electronic Structure in a Bifunctional Organocatalyst through Double Hydrogen Bonding
1,5,7-Triazabicyclo[4.4.0]dec-5-ene (TBD) is a widely used bifunctional organocatalyst; however, its microscopic behavior in hydrogen-bonding environments remains poorly understood. In this study, we employed broadband rotational spectroscopy to identify the stepwise microhydration of TBD with one to four water molec...