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Reactions of Coordinated ligands Assignment

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Added on: 2023-02-03 06:15:53
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1. Append risk assessment, spectra and experimental observations from duplicate book.



a) Consider the IR spectra of each of the compounds in the spectral region 400-2000 cm-1 and  answer the following questions:1 

  • Identify 4 of the intense bands of the phenanthroline ligand; list the wavenumber of  these bands for free phenanthroline and phenanthroline coordinated to CoII and CoIII. phen Are the vibrational bands of the phen ligand reasonably similar for the three cases? Do the bands uniformly move to higher or lower wavenumber ? 

  • What do the observations in part i) imply about the bonding within the phen ligand in  the coordinated and free forms? (Hint: if the spectra are similar then the  bonding/local symmetry of the ligand is retained, if not then a significant change in  bonding/symmetry is implied)
  • Compare the changes in vibrational spectra of the phen ligand which result from  conversion to the quinone. What has more effect on the bonding within the phen  ligand, binding to the metal or conversion to the quinone? 
  • Identify the ?(CO) band of the quinone and the vibrational bands due to the anions  (why is no anion vibration observed for [Co(phen)3]Br2?)

b) Preparation of resolved D(+)-tris(phen)cobalt(II) is achieved by precipitation with  antimonyl-d-tartrate [in an analogous procedure to that given in step 3 (a)]. This reaction  proceeds with QUANTITATIVE conversion of Co2+ to D(+)-tris(phen)cobalt(II). How is  it possible to achieve a yield of >50?sed on Co2+ (i.e. >100% optical yield) in this  case?

c) The oxidation of D(+)-tris(1,10 phenanthroline)cobalt(II)antimonyl-d-tartrate by chlorine  proceeds with retention of optical activity. Why does this infer that the cobalt(II) complex  is in the solid-state when it is oxidised?

d) [Co(phen)3]2+ catalyses the racemisation of D-(+)[Co(phen)3]3+. Propose a mechanisim for  this reaction.

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  • Uploaded By : Katthy Wills
  • Posted on : February 03rd, 2023
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