Then the remaining reference spectra numbers should be checked in the Numerical Index which gives the compound name or checked against the actual reference spectrum. A single digits of these columns with a zero added represents the last two digits of the band location. 30 means that the strongest band is located at 3050 cm -1 . A two digit number in any of these columns represents the last two digits of a band location in the region is one hundred less than the column heading, e.g., a 50 in column 30 means that the strongest band is located at 2950 cm -1 . Not all compounds have all types of spectra.
Infrared spectra are the most common, and ultraviolet has the fewest.
If the column you need is blank, be sure to check the index supplement to see if a spectrum was published after 1981. The spectrum page itself includes the structural formula , with solvent, sample purity, source and equipment information. The NMR 13 C and UV spectra also give assigned peaks. Report any missing pages to library staff. If you can't find a spectrum for your compound ask the librarian for assistance.