Analytical Techniques Flashcards
Analytic Techniques: Chemical Analysis
What’s the purpose of using Analytic Techniques?
To find the structure of an unknown sample of a organic compound
Analytic Techniques: Chemical Analysis
What’s the purpose of using Infrared Spectroscopy?
Finds different types of bonds in an unknown sample
Analytic Techniques: Chemical Analysis
What’s the purpose of using Mass Spectroscopy?
Finds mass of unknown compound
Analytic Techniques: Infrared Spectroscopy
How reliable is Infrared Spectroscopy?
Unreliable
↳ there’s some uncertainty
Analytic Techniques: Infrared Spectroscopy
What’s the Absorption Range for an Alcohol (O-H)?
3200 - 3600
Analytic Techniques: Infrared Spectroscopy
What’s the Absorption Range for Carboxylic Acids (O-H)?
2500 - 3000
Analytic Techniques: Infrared Spectroscopy
What’s the Absorption range for Aldehydes & Ketones (C=O)?
1640 -1740
Analytic Techniques: Infrared Spectroscopy
What’s the Absorption Range for Alkanes (C-H)?
2850 - 2950
Analytic Techniques: Infrared Spectroscopy
What’s the Absorption Range of Alkenes (C-H)?
3000 - 3100
Analytic Techniques: Infrared Spectroscopy
What’s the Absorption Range for Alcohols (C-O)?
1000 - 1300
Analytic Techniques: Infrared Spectroscopy
How would u identify an O-H bond?
(alcohol)
- Stretch at around 3000
- Strong & broad
Analytic Techniques: Infrared Spectroscopy
How would u identify an O-H bond?
(carboxylic acid)
- Stretch between 3000 & 2500
- Messy
Analytic Techniques: Infrared Spectroscopy
How would u identify a C-H bond?
(alkane or alkene)
- Stretch below 3000
- Short sharp stretch next to an O-H bond
- All organics have this
↳ they’re HC
Analytic Techniques: Infrared Spectroscopy
How would u identify a C-O bond?
(alcohols)
- Stretch in the fingerprint region
Analytic Techniques: Infrared Spectroscopy
What’s a Fingerprint Region?
Any stretch on 1500 & below
↳ isn’t required to be analysed