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Purpose: Three organic compounds will be analyzed via IR spectroscopy to confirm the presence of each functional group and bonds within.
Purpose: Three organic compounds will be analyzed via IR spectroscopy to confirm the presence of each functional group and bonds within.
The above compounds were chosen due to their diversity of functional groups (FGs)!
The above compounds were chosen due to their diversity of functional groups (FGs)!
Carvone is a terpenoid, produced naturally by spearmint and caraway, and many other plants
Carvone is a terpenoid, produced naturally by spearmint and caraway, and many other plants
- Terpenoids are the oxidation products of terpenes.
- Carvone is the product of limonene oxidation.
Methyl salicylate (wintergreen oil) is an organic ester, produced naturally by many species of plants
Methyl salicylate (wintergreen oil) is an organic ester, produced naturally by many species of plants
- Can be manufactured synthetically.
- Related to aspirin.
Aspirin (acetylsalicylic acid) is a nonsteroidal anti-inflammatory drug (NSAID)
Aspirin (acetylsalicylic acid) is a nonsteroidal anti-inflammatory drug (NSAID)
- Synthetic version of salicin - derived from willow bark (tree of the Salix species)
- Works by inhibiting cyclooxygenases, which stops your body from making as many prostaglandins.
What's Infrared (IR)???
What's Infrared (IR)???
Dictionary definition: (of electromagnetic radiation) having a wavelength just greater than that of the red end of the visible light spectrum but less than that of microwaves. Infrared radiation has a wavelength from about 800 nm to 1 mm, and is emitted particularly by heated objects.
One application of IR is Infrared thermography, or thermal imaging, utilizes thermographic cameras to detect the long-infrared range of the electromagnetic spectrum.
Thermal images of a moo cow (left) and planet (right). THEMIS = THermal EMission Imaging System (instrument)
The images above are a very different application of IR radiation than how it's used in the organic labs, but it's cool to relate new techniques to something you may be more familiar with!
Learning Objectives
Learning Objectives
· Understand principles behind IR Spectroscopy as it relates to the stretching & bending of bonds
· Observe the inverse relationship between vibrational frequency and bond length
· Analyze spectra to predict functional groups and bonds in an organic molecule
· Understand the role resonance plays in vibrational frequencies
· Observe effects on sample preparation on quality of spectra
How to do this remote lab
How to do this remote lab
On the pages that follow, read the captions, check out the photos, and watch videos
No sound on videos, aside from background music, for accessibility reasons
Record observations and data from IR spectra
Every student will turn in data & observations along with the Partner Agreement
Click the blue buttons to move on to the next step
We want everyone to make all the mistakes. You'll always be put back on the right track.
Click on the 'Home' menu on the top right to jump back or forward to main parts of the lab
Assessment components (Remote students) - to-do list
Assessment components (Remote students) - to-do list
Exp 4 Pre-lab quiz - take on Canvas before section
Fill out the Partner Agreement & Data / Observations from Canvas during lab
Every student submits this individually on Canvas at the end of lab
Participation during your enrolled section - tracked by Zoom polls - contact your TA immediately if you are unable to attend and we'll make other arrangements
Complete the Academic Integrity Form on Canvas
Contribute to the Experiment 4 Canvas Discussion - check Canvas to see if this is required
You and your partner complete the lab report (notebook pages, IR tables & in-lab question, and worksheet) together per your Partner Agreement
Full details on page 1 of the Exp 4 PDF
Submit on GradeScope as a pair one week after doing the remote lab - due at enrolled lab start time - instructions are on Canvas
Neatness & Organization - proper format, spelling, and grammar. Refer to writing guidelines, Parts A-B.
I'm fully prepared, let's start:
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