This data is used to for compounds which share the shifts within specified constraints.
Peak range or other spectral characteristics - The user numerically enters data related to a spectra of an unknown compound. Registration number - Commonly the CAS Registry Number but most databases also have their own numbering scheme. Molecular structure - This method requires a molecular editor interface. 
Molecular formula - Either an exact formula or a range. Compound name - May include official IUPAC names and common names. Some database search methods are commonly available: ( March 2012) ( Learn how and when to remove this template message) Statements consisting only of original research should be removed. Please improve it by verifying the claims made and adding inline citations. This section possibly contains original research. A variety of commercial and free of software programs allow users to process FID data into useful spectra once FID data is downloaded. This data format contains the most information and requires the most storage space. The raw free induction decay data obtained when performing the experiment are stored according to the formatting preferences of the instrument manufacturer. The processed image has less information that a raw FID but it also take less memory and is easily displayed in browsers and requires no specialty data handling software. This method requires more memory than a line list but supplies the user with considerably more information. Once an FID is processed into a spectrum it can be converted into an image that usually takes up less memory than the FID. The advantage of a line list is that it requires a minimal amount of memory. These line list however lack first and higher order splitting, satellites from low abundance isotopes like carbon or platinum, as well as the information concerning line width and other informative aspects of line shape. It is common for databases to display line lists graphically in a manner that is similar to how processed spectra might appear. The form in which most NMR is described in literature papers. 
3.9 Spectral Database for Organic Compounds. 3.4 Wiley's KnowItAll NMR Spectral Library. 3.3 Biological Magnetic Resonance Data Bank.
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