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Pharmacy Y2- Exam 2 > Fluorescenceand moleular characteristic > Flashcards

Fluorescenceand moleular characteristic Flashcards

1
Q

the longer the wavelength….

A

the lower energy the radiation carries

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2
Q

what does high frequency mean for the wave length and energy?

A

shorter and higher

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3
Q

why is specroscopy important in pharmacy?

A
  • used to determine the structure of an unknown molecule
  • confirming the structure of a known molecule
  • examples of spectroscopic application of drug discovery and pharmaceuticals
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4
Q

what kind of spectrscopy does IR measure higher or lower?

A

lower

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5
Q

what time of radiation can break bonds ?

A

UV-Vis spectrscopy

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6
Q

what is associated with Infrared absorption regarding the bonds?

A

vibrations

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7
Q

what does a vibration need to be, to be visible?

A

asymmetric there needs to be a dipole moment

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8
Q

what type of vibration should occur for the vibration to be visible?

A

-bending and asymmetrical stretching

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9
Q

what is the frequency for IR for N-H?

A

3300-3500cm-1

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10
Q

what is the frequency for IR for C-H alkyne?

A

3300cm-1

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11
Q

what is the frequency for IR for O-H?

A

3200-3400cm-1

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12
Q

what is the frequency for IR for C-H alkenyl?

A

> 3000cm-1

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13
Q

what is the frequency for IR for for C-H alkyl?

A

<3000cm-1

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14
Q

what is the frequency for IR for C-H?

A

2850-3100cm-1

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15
Q

what is the frequency for IR for C triple bond N or C triple bond C?

A

2100-2260cm-1

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16
Q

what is the frequency for IR for C=O?

A

1650-1800cm-1

17
Q

what is the frequency for IR for the fingerprint region?

A

500-100cm-1

18
Q

what affects the C=O frequency?

A
  • electron withdrawing groups such as oxygen on neighbouring atom will increase number
  • conjugation will reducde bond strength so number is lower
  • electron donating groups like nitrogen will reduce
19
Q

what is the typical UV-visible transition?

A

involves promotion of an electron from the highest occupied molecular orbital (HOMO) to the lowest unoccupied molecular orbital

20
Q

the more conjugated the pie system…

A

the lower the energy require for an electronic transition

21
Q

what is a chromophore?

A

functional group responsible for UV absroption

22
Q

when may products become coloured ?

A

when the absorbed light is visile in the region and when they are highly conjugated natural products

23
Q

what makes our blood red?

A

the haemoglobin because of the iron that has a very conjugated structure meaning it can absorb in the visible region

24
Q

what is fluorescence?

A

when an atom that has been excited to a higher enegry level decays and goes back down to the loer level again

25
Q

how does the energy decay?

A

decays via non radative ways like heat

Pharmacy Y2- Exam 2 (8 decks)

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