Spectroscopic techniques Flashcards

1
Q

X-ray diffraction.

A

Electron density plot shows position of atoms. H atoms not detected due to minimal electron density around them.

Pros: Gives location of all atoms
Cons: Needs good quality crystals, H undetected

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2
Q

Mass spectrometry

A

Gives mass of sample molecules, plus information about bonding from fragments

Pros: Gives molecular formula, good for mixture analysis, tiny sample needed
Cons: Difficult to interpret when unknown

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3
Q

Mass spectrometry

A

Gives mass of sample molecules, plus information about bonding from fragments

Pros: Gives molecular formula, good for mixture analysis, tiny sample needed
Cons: Difficult to interpret when unknown

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4
Q

Electrospray ionisation steps

A
  • Solution of sample sprayed through high potential nozzle
  • Solvent evaporates leaving charged droplets
  • Target molecule with ion attached is detected
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5
Q

IR Spectroscopy

A

Detects vibrational transitions in bonds. Only works when vibration leads to change in dipole moment.

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6
Q

Wavenumber equation

A
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7
Q

Raman spectroscopy

A

Used when there is no change in dipole moment

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