Chemistry search tools

ChemSpider
A free chemical structure database providing fast text and structure search access to over 26 million structures from hundreds of data sources.

e-Eros
Gives detailed information on more that 5,100 reagents and catalysts for chemists working on organic syntheses.

International Tables for Crystallography
The definitive resource and reference work for crystallography and structural science, including 1100 tables of symmetry-group data for crystal-structure analysis.

Physical Sciences Data-Science Service
Provides access to a suite of commercial databases and services including ACD/I-Lab2, CSD, DETHERM, SPRESIweb and ICSD.

PubChem
PubChem is an open chemistry database at the US National Institutes of Health (NIH). PubChem includes information on chemical structures, identifiers, chemical and physical properties, biological activities, patents, health, safety and toxicity data.

Reaxys
Reaxys provides information from the essential chemistry databases Beilstein, Gmelin as well as chemical patent information.

SciFinder-n 
Covers all areas of chemistry and chemical engineering. May be searched on factual data or by using structures and substructures.

Springer Materials
Consists of 400 volumes, 250,000 substances and 1,200,000 citations covering a range of subjects including physical chemistry and crystallography. Includes Landolt-Börnstein.

Web Thermo Tables
The web version of the TRC Thermodynamic Tables.  A collection of thermodynamic property data primarily for pure organic compounds.

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Multidisciplinary search tools  

Web of Science

Gives access to:

Web of Science Core Collection
Conference Proceedings Citation Index
Journal Citation Reports

Scopus
Indexes peer-reviewed research literature with more than 20,500 titles from more than 5,000 international publishers.