a) Answer ALL parts a) - c). i) State the selection rule for an IR active transition. What factor influences the intensity of an IR band? ii) With the aid of a diagram, describe the bonding between a CO ligand and a d-block transition metal ion. iii) Explain why [V(CO)6]- has a lower CO stretching frequency than [Mn(CO)]*. iv) Briefly discuss the influence that binding mode (terminal vs bridging) has on the stretching frequency of CO in coordination complexes.

Fundamentals Of Analytical Chemistry
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Chapter26: Molecular Absorption Spectrometry
Section: Chapter Questions
Problem 26.30QAP
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3.
Answer ALL parts a) - c).
i)
State the selection rule for an IR active transition. What factor
influences the intensity of an IR band?
ii) With the aid of a diagram, describe the bonding between a CO ligand
and a d-block transition metal ion.
iii)
Explain why [V(CO)6]- has a lower CO stretching frequency than
[Mn(CO)]*.
iv) Briefly discuss the influence that binding mode (terminal vs bridging) has
on the stretching frequency of CO in coordination complexes.
c) A single analysis using chromatography produced a chromatogram with three
peaks. The peak for compound A has a retention time of 0.44 min, compound
B of 5.86 min and compound C of 6.14 min.
i)
Compound A does not interact at all with the stationary phase. What
information can be obtained from the retention time of A?
ii)
Calculate the retention factors for compounds B and C respectively.
iii)
Calculate the selectivity factor for compounds B and C.
iv)
The peaks for compounds B and C have respective widths of 0.32 min
and 0.35 min. Calculate the resolution of compounds B and C, and
comment on the significance of the magnitude of your answer.
v) The peak for compound C has a Full Width Half Maximum (FWHM) of
0.14 min. Calculate the number of theoretical plates for compound C.
vi) Given that compound C is analysed using a column of length 20 m,
calculate the Height Equivalent of Theoretical Plates (HETP).
a)
Transcribed Image Text:3. Answer ALL parts a) - c). i) State the selection rule for an IR active transition. What factor influences the intensity of an IR band? ii) With the aid of a diagram, describe the bonding between a CO ligand and a d-block transition metal ion. iii) Explain why [V(CO)6]- has a lower CO stretching frequency than [Mn(CO)]*. iv) Briefly discuss the influence that binding mode (terminal vs bridging) has on the stretching frequency of CO in coordination complexes. c) A single analysis using chromatography produced a chromatogram with three peaks. The peak for compound A has a retention time of 0.44 min, compound B of 5.86 min and compound C of 6.14 min. i) Compound A does not interact at all with the stationary phase. What information can be obtained from the retention time of A? ii) Calculate the retention factors for compounds B and C respectively. iii) Calculate the selectivity factor for compounds B and C. iv) The peaks for compounds B and C have respective widths of 0.32 min and 0.35 min. Calculate the resolution of compounds B and C, and comment on the significance of the magnitude of your answer. v) The peak for compound C has a Full Width Half Maximum (FWHM) of 0.14 min. Calculate the number of theoretical plates for compound C. vi) Given that compound C is analysed using a column of length 20 m, calculate the Height Equivalent of Theoretical Plates (HETP). a)
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