Organic Chemistry Spectroscopy

Chpt 12, 13,

What information does Infrared Spectroscopy give?

Functional groups

What information does Mass Spectroscopy give?

Molecular weight & formula

IR Spectroscopy, what appears around 1600?

Alkenes

Aromatic ring

What shows up around 1600-2000 (IR)?

double bonds

What shows up around 2000-2500 (IR)?

triple bonds

What shows up around 2600-3000 (IR)?

hydrogen bonds

What functional group is present around 3200-3500 and shows a strong peak (IR)?

Alcohol

What functional group presents around 1700-1725 (IR)?

Carbonyl group

What shows around 2700 (IR)?

Aldehyde C-H stretch

Which functional group gives us nothing (IR)?

Ethers

Which functional group presents two peaks around 1300-1000 (IR)?

Ester C-O stretch

An electronegative hydrogen bond shows around 3200-3000 with a weak peak (IR), which atom is it?

Nitrogen

Alkenes peaks are …?

weak

What is the molecular ion?

mw of original compound

Where does the molecular weight show up? It’s the ______ in its group.

Far right

Tallest

What is the base peak?

Tallest peak

What does m+2 give?

halides present

What is this formula calculating?

# of carbons

If M+1 is absent, how can the number of carbons be found?

Divide M+ by 12

What is the ratio of Br (MS)?

1:1

What is the ratio of Cl (MS)?

3:1

What is the ratio of sulfur (MS)?

100:4

What information can the m/z tell us?

mw

# of Ns

Which atom could be present but does not show on the MS?

O

What mass should be used to calculate the amount of each type of atom?

Nominal