structure elucidation

Question 1

describe a polyene chromophore and its spectra

Answer 1

alkene double bonds in conjugation, simple spectra with one absorption peak

Question 2

describe an aromatic spectra

Answer 2

peak before 200nm thats usually ignored, short peak after 200nm and an even smaller peak after 250nm

Question 3

explain beer-lambert equation

Answer 3

It relates the absorption of a substance to its concentration, path length, and molar absorptivity.

Question 4

explain a limitation of UV spectroscopy.

Answer 4

cant prove the identity of a compound, only indicate structure.
EG- progesterone and testosterone have different structures but have the same chromophores

Question 5

list some pharmaceutical applications or IR

Answer 5

1. identifying raw materials used in manufacturing and identifying drugs
2. identifying functional groups
3. analyzing samples in solid and semi-solid states. (creams&tablets)

Question 6

what does absorption frequency depend on

Answer 6

1. mass of bonded atoms
2. strength of bond