Chemistry

Developed and maintained at the Institute of Biochemistry at the University of Cologne, BRENDA is a database of enzyme functional data for approximately 3,500 enzymes. Searchable by enzyme names and synonyms, E.C. (Enzyme Commission) number, CAS Registry Number, reaction and reaction type, organism, substrate, etc. Providing data, literature references, and commentary on strain and database sources.

Search unpublished preprint articles in chemistry and related fields.

The RSC organizes this free chemical structure database providing fast access to over 29 million structures, properties and associated information.

Online, open access textbooks available for a variety of chemistry courses.

Risk data on 700,000+ chemicals

NCBI is a multi-disciplinary research group composed of computer scientists, molecular biologists, mathematicians, biochemists, research physicians, and structural biologists concentrating on basic and applied research in computational molecular biology providing research through a variety of free databases.

Thermochemical data for over 5000 organic and small inorganic compounds. Reaction thermochemistry data for over 8000 reactions. IR spectra for over 7500 compounds. Mass spectra for over 10,000 compounds. UV/Vis spectra for over 400 compounds. Electronic and vibrational spectra for over 3000 compounds. Constants of diatomic molecules (spectroscopic data) for over 600 compounds. Ion energetics data for over 14,000 compounds. Thermophysical property data for 16 fluids.

PubChem is organized as three linked databases: PubChem Substance, PubChem Compound, and PubChem BioAssay that provide information on the biological activites of small molecules.