Chemistry: Websites

The CAS Source Index (CASSI) Search Tool is an online resource intended to support researchers and librarians who need accurate bibliographic information. Use this free tool to quickly identify or confirm journal titles and abbreviations for publications indexed by CAS since 1907, including serial and non-serial scientific and technical publications.

Chemical, physical & spectroscopic data of many chemical substances . Includes IR, NMR, MS, UV, thermochemical data for substances & reactions, etc. Searchable by structure, formula, and property values. Compiled by NIST under the Standard Reference Data Program

Science.gov is a gateway to government science information and research results. Currently in its fifth generation, Science.gov provides a search of over 50 scientific databases and 200 million pages of science information with just one query, and is a gateway to over 2100 scientific Websites.

Free database of chemical spectra. IR, MS, NMR spectra. Organized by National Institute of Advanced Industrial Science and Technology (AIST), Japan.