Explain how the functional groups were determined based IR
How did you get the exact structure from using NMR
Identify how chemical shifts and peaks areas match hydrogens in the proposed structure
Comment on splitting patterns if they are discernible
Determine the identity of the unknown, explaining why the structure is consistent with NMR and IR
Include melting/boiling points, compare with the literature value of your unknown
Include the reflective index
Include the spectra, including comments
Identification of an Unknown Compound Purpose: To identify an unknown organic substance using physical and spectroscopic techniques. Safety Considerations: unknown to you Handle these You will be working with substances whose identity is substances with care. Do not allow them to come into contact with your skin and do not inhale their vapors. other safety precautions can be found in this experimental protocol. Strategy These substances will contain no more Be sure to record the number of your unknown. ri and only C,H, Br than two functional groups (three possibly with an aromatic or Cl. To determine the structure you are required to carry out the following steps: 1. Determination of the melting or boiling point. other than 2.ov mobtain the elemental analysis to determine the presence ofelements carbon, hydrogen and oxygen. 3. n u Run the IR spectrum to identify functional groups. the molecule, and possibly to 4. obtain the mass spectrum to determine the size of determine other structural properties of the molecule. that of your proposed 5 ii obtain the 'H-NMR spectrum and indicate how it matches structure. You do not need to use the lab report template for this report, as there are no materials besides the unknown and no reactions. You should, however, be sure to record your melting or boiling point on a data page that will be signed and turned in with your report. Preliminary examination of the physical and chemical characteristics of the substance and determination of boiling or melting point. Note the following Physical state (solid or liquid) Color odor This is of very limited use, in the odor (use the wafting method to determine the boiling point however, if you have a foul-smelling liquid you should do the hood.) point or Boiling point Refractive index (for liquids only-optional) Elemental analysis This information will be provided to you with your unknown. counting an aromatic A compound can contain either one or two functional groups, not ring.
