What is ChemNetBase? How do I use it?

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ChemNetBase is a collection of Chemistry Reference Sources. The library subscribes to all of the titles listed. Many of the titles allow searching using the structure of a compound. A free plugin must be downloaded to enable the drawing program, but searching can be done without the plugin using text terms, and sometimes data.

The Combined Chemical Dictionary can be searched collectively or individually and includes:

  • Dictionary of Commonly Cited Compounds (also included in CCD)
  • Dictionary of Drugs (Formerly Pharmasource; also included in CCD)
  • Dictionary of Inorganic and Organometallic Compounds (also included in CCD)
  • Dictionary of Natural Products (only partially included in CCD)
  • Dictionary of Organic Compounds (also included in CCD)

The following titles are searched individually:

  • The Handbook of Chemistry & Physics
  • Polymers: A Property Database
  • Properties of Organic Compounds
  • Dictionary of Marine Natural Products
  • Dictionary of Natural Products
  • Dictionary of Food Compounds
  • Dictionary of Carbohydrates
  • CRCPress Periodic Table Online

Handbook of Chemistry & Physics

A powerful Structure/Properties search has been added to the Handbook. This finds matches in the handbook tables covering 20,000 compounds. Click the link in the header, and select from a large menu of properties to search. Here is a look at the property search screen. Try Melting Point between 47 and 51, and boiling point under 200.

You can also use the search box in the header of Handbook of Chemistry and Physics to search the entire text for entries. Many of the tables are interactive tables, although some are pdfs.

Example:

For pka values use "Text Search" to find the Dissociation Constants table. This table can be filtered to match a pka value. Enter the decimal so the search looks like "pka contains 10."

Combined Chemical Dictionary (CCD)

Use CCD if you want to know a bit of information about a known compound. For chemists who know the name of what they want, but can draw it, use the query def plugin to draw the structure.

You don't have to draw. Leave the draw part blank, and enter or browse other terms. You can also enter a range for Melting and Boiling Point for unknown compound matches, but it is more likely that students will use Properties of Organic Compounds for those searches, because it has more options for searching.

You can choose what fields to show in the brief results of CCD. Use "Columns" to select the fields to show. Use the drop-down menu to choose "Exact Match" in most cases.

Properties of Organic Compounds

Students in Organic Chemistry classes are expected to use Properties of Organic Compounds to locate possible matches for an unknown compound that they subject to various tests to determine such things as Melting Point, Boiling Point, Density and Molecular Weight. They may also use instruments to determine spectral peaks, such as IR, UV.

Click "Exact Match", then fill in range values.

Range searching:

To search for a range of values, you can use a hyphen but you must remember to insert a space between hyphen and numbers. For example, to search the Melting Point field for a melting point within the range of 47 to 51 degrees Celsius, key in 47-51 or use the index to select the range.

Click "Submit Search" on the left-hand menu.

Click on the Compound Name to view the entry.

Click the Benzene Ring symbol to view the structure;

Click Print Preview Text and Structure - on the left-hand menu.

Dictionary of Natural Products

Several biology and chemistry faculty and their independent study and summer students have studied the biological activity of natural products. Make sure they take advantage of this specialized resource.