SDBS Integrated Spectral Database for Organic Compounds

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1 SDBS Integrated Spectral Database for Organic Compounds Sample Search for Chemistry 130 Grace Baysinger and Dr. Dave Keller

2 SDBS URL and Description SDBS includes 6 different types of spectra under a directory of the compounds. The six spectra are: Electron impact Mass spectrum (EI-MS), Fourier transform infrared spectrum (FT-IR) 1 H nuclear magnetic resonance (NMR) spectrum 13 C NMR spectrum Laser Raman spectrum Electron spin resonance (ESR) spectrum It is possible to search by number of atoms, spectral peaks, plus compound name, molecular formula, molecular weight, and CAS Registry Number. 2

3 SDBS Welcome Page 3

4 SDBS - Search Form Note: for each peak, a range of values is actually being searched 4

5 13 C NMR Spectra Data Search Tips Search 13 C spectral peaks first as they most closely match your lab data 1 H NMR IR Use midpoints of multiplets as spectral peak values OH peaks for alcohols and acids, and NH peaks for amines may wander so your values may not agree with the database Only include major peaks in IR search; usually < 2800 cm -1 5

6 Spectra Data Search Tips Be sure to omit any peaks due to solvent For Chem 130, the complete range for a spectral diagram is about: 13 C NMR: 0 to ~220 ppm IR: ~600 to ~4000 cm -1 1 H NMR: 0 to ~12 ppm Add no shift regions (i.e. no peak present) to refine a 13 C or 1 H NMR search Review of General Search Strategy Search spectral peaks using conventions required by search interface Search 13 C NMR first, IR second, and 1 H NMR last Refine using no shift regions for 13 C and 1 H NMR data Further refine using heteroatom and/or hydrogen data 6

7 SDBS - Tips for Converting Selected Lab Data to Search Strategies Type of Search Lab Data Values Searched CAS Registry Number Molecular Formula Number of Atoms 13 C Peaks Not available from lab data C 6 H 5 Br 5-6 Hydrogens, 1-4 Oxygens, No Nitrogen present 128, 129, 130, 133, 172 No Shift Region and C6H5Br Hydrogen 5 to 6, Oxygen 1 to 4, Nitrogen 0 to 0 128,129,130,133,172 No Shift Regions ,125 5 Error Range +/- 2.0 Caveats Use CAS RN to find/confirm physical properties info and view spectral diagram. Element symbols are case sensitive in many resources but not in SDBS. Put MF in Hill System Order (Carbon 1st, Hydrogen 2nd, and then all other elements in alphabetical order). Comma is the separator for multiple shifts. Range is defined by two numbers separated by a space. Ranges for multiple peaks put space between upper and lower range of each peak, use comma between each range with no space between comma and values. Complete range for Chem 130 is 0 to ~220 ppm. IR Peaks 1688, 1454, 1327, 1294, 936, ,1454,1327,1294,936,708 +/-10 Use either a space or a comma as the separator for multiple peaks. Use a hyphen to search a range of values (e.g ). Only include major peaks, usually < 2800 cm -1 Complete range for Chem 130 is ~700 to ~4000 cm-1 1 H-NMR Peaks 8.12, 7.6, 7.46 No Shift Region and ,7.6,7.46 No Shift Region , /- 0.2 ppm Use midpoints of multiplets as spectral peak values. Comma is the separator for multiple shifts. Range is defined by two numbers separated by a space. Ranges for multiple peaks put space between upper and lower range of each peak, use comma between each range with no space between comma and values. Complete range for Chem 130 is 0 to ~12 ppm. Don't use peaks from solvent! revised 8 November

8 13 C NMR Spectrum of Unknown 8

9 SDBS 13 C NMR Search Peaks, No Shift Regions, and Number of Atoms Use comma with no spaces for multiple peaks. For ranges use space between upper and lower values. Use comma with no spaces for multiple ranges. Peaks=128,129,130,172. No peak region= ,110 5 N, F, Cl, Br, I, S, P, Si not present 9

10 SDBS - Brief Display of Results Summary of available spectra (Yes/No) Review molecular formulas and eliminate some compounds from further consideration based on heteroatoms present. Remaining compounds can be quickly compared to unknown using 1 H, 13 C,and IR spectra as well as functional groups listed in name 10

11 SDBS View 13 C NMR in CDCl 3 for Benzoic Acid (=Unknown) 11

12 IR Spectrum of Unknown 12

13 SDBS IR Search Peaks and Number of Atoms Peaks = 1688,1454,1327,1 294,936,708 N, F, Cl, Br, I, S, P, Si not present 13

14 IR Search Results Results on each page are sorted by MW. Use heteroatoms and functional groups in chemical name of to help eliminate candidates. 14

15 SDBS - Viewing IR Spectra for Benzoic Acid 15

16 1 H NMR Spectrum of Unknown For multiplets, use midpoints as spectral peak values 16

17 SDBS 1 H NMR Search Peaks, No Shift Regions, and Number of Atoms Peaks = 8.12,7.6,7.46 No shift Regions = , N, F, Cl, Br, I, S, P, Si not present 17

18 SDBS - 1 H NMR Search Results 18

19 SDBS Viewing 1 H NMR (90 MHz in CDCl 3 ) for Benzoic Acid Each hydrogen is labeled and assigned to a peak with a given chemical shift in ppm. Click on peak data button for list of individual peaks. 19

20 SDBS 1 H NMR Peak Data for Benzoic Acid 20

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