Infrared spectroscopy Flashcards

1
Q

What is this technique used for?

A

To identify compounds based on changes in vibrations of atoms when they absorb IR of certain frequencies

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2
Q

What does a spectrophometer do?

A

Irradiates sample with EM waves in infrared region

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3
Q

What does a spectrophometer do once it hass irradiated the sample?

A

Detects the intensity of the wavelength of IR radiation which goes through the sample

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4
Q

Do all organic molecules absorb IR radiation?

A

Yes

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5
Q

What will happen to bonds between atoms when they absorb IR radiation?

A

Depending on which energies of radiation are absorbed, bonds will vibrate by stretching, bending and twisting

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6
Q

Will organic molecules always vibrate?

A

No - only at a specific frequency

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7
Q

What is the resonance frequency?

A

The specific frequency at which the molecules will vibrate to stimulate larger vibrations

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8
Q

What is the wavenumber?

A

Depeneding on the rest of the molecule, each vibration will absorb specific wavelengths of IR radiation

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9
Q

What is the wavenumber also shown as?

A

The reciprocal of the wavelength (cm^-1)

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10
Q

What do particular abosrbances have?

A

Characteristic widths (broad or sharp)
Intensities (strong or weak)

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11
Q

How can different functional groups be identified?

A

By comparing its IR spectrum to the IR spectrum of a known compound

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