Chemistry: Essential

SciFinder is the most comprehensive source of chemical information available. It indexes journal articles, conferences, books, reports and patents, as well as chemical substances and reactions. First time users must sign up for an individual SciFinder account.

Covers major journals in all areas of science. Allows citation searching and analysis.

Scopus is a large multidisciplinary database covering published material in the humanities and sciences. It also provides citation analysis of authors and subject areas. Also includes access to Scival via expanded top menu (Elsevier personal registration required).
For more information on text & data mining

A comprehensive database on fully determined inorganic crystal structures recorded in the literature of the field from 1913 to the present.

A collection of electronic reference works including the Dictionary of Organic Compounds and the CRC Handbook of Chemistry and Physics.