NIST Chemistry WebBook

The NIST Chemistry WebBook is a free online databse that provides detailed information on chemical substances, including molecular structures, thermodynamic properties, reaction data, and spectral data. It features a user-friendly search function based on chemical names, molecular formulas, and CAS registry numbers. The database includes thermodynamic data (such as melting points, boiling points, and heat of formation), spectroscopic data (including IR, UV/Vis, and NMR spectra), and reaction data (like chemical reaction rate constants). It is widely used as a reliable source of information in scientific research and education.