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7 Cards in this Set
- Front
- Back
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what are NMR spectroscopy |
-analytical method that allows chwmists to deduce the structure of a chemical compound |
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what deos NMR tell us |
-different chemical environment affect the strength of magnetic field thatv must be applied to a nucleus in order for it to enter the resonance state - by measuring the strength of the magnetic field that must be applied. NMR gives us information about the local evironment of specific atoms in a molecule -this can be used to deduce informtion about molecular strucutre |
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describe carbon NMR |
-one signal for each carbon atom present - no link between area of signal to number of carbons in molecules -no splitting |
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describe proton nmr |
one signal for each set of equivalent h atoms the area of the signal is proportional to the number of hydrogen atoms it represents the number of lines a signal is split into gives information about the neibouring hydrogens the number of lines = 1+ the number of inequivalent H atoms on adjacent C atoms |
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What are some common signals to look out for |
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What solvents are used why |
Ccl4 Cdcl3 Because they dont contain hydrogen. Only give one signal Non toxic Inert Low boiling point Signal given is further right than most organic compounds |
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How are samples calibrated |
Using a small quantity of tms |
