QUESTION FIVE (a) Describe an experiment to determine the spectrochemical series of three ligands of your choice using the UV-VIS spectrophotometer. [8 marks] (b) Explain the existence of both sharp and broad peaks in the UV-VIS spectrum of [MnF6]. [5 marks] (c) Describe the determination of Racah parameters using the Tanabe-Sugano

How many different  phosphorus chemical environments are there for trans-[RhClCO(PPh3)2] and cis -[RhClCO(PPh3)2] complexes in 31P- NMR spectra?

(b) Consider the infra-red spectrum of the complex [(15-C5H5) Fe(CO)2]2 below and answer the questions which follow: (i) (ii) 2300 (A) 2100 r (B) 1900 1700 Wavenumber (cm-¹) 1500 Draw the structure of the dinuclear complex [(15-C5H5) Fe(CO)2]2. (15-C5H5) is the cyclopentadienyl ligand. Assign the bands (A) and (B) to the CO ligands in your structure drawn. Motivate your answer.

2. Types of NMR spectroscopy in pharmaceutical analysis. Reference compound, its structure, characteristics, and the reasons for selecting.

Explain the process of isolation and characterization of Enalapril in tablets for the commercial drug vasotec, by way of extraction of the solid phase and spectroscopy of infrared..

1. Answer BOTH parts a) and b). a) i) Explain the difference between spin-lattice relaxation (T₁) and spin-spin relaxation (T2). ii) Deuterated acetone, (CD3)2CO, is a common solvent for NMR spectroscopy. Sketch the 1³C{¹H} NMR spectrum of this solvent. Label and explain any coupling in your spectrum. iii) Predict the structure of the residual protio-solvent species observed in the ¹H NMR spectrum of (CD3)2CO. b) OH A B C max 260 nm 295 nm i) Suggest electronic transitions that can be attributed to the absorptions reported for compounds A and B, respectively. ii) With the aid of diagrams explain why B absorbs at a lower energy to A. iii) Explain why compound C possesses a charge transfer transition. iv) For compound C explain why changing solvent polarity influences the wavelength of the charge transfer absorption. -CEZ

( dont answer after 11.05 am asap

3D2: Recognize and interpret four levels of 1H NMR data: H group signal symmetry, peak height, signal splitting, and chemical shift (8) in the determination of organic structure. (a) Complete the data table for the given 'H NMR spectrum. 1H NMR Spectrum 10 9 label a b с d 8 7 6 8 (ppm) 1 5 1H, t (b) Deduce a structure for a MF of C6H12Osthat fits the 'H NMR data set. I 4 6H, s 1 3 2H, di #H (peak height/integral) 3H, s 2 1 splitting TMS 4 0 8 (ppm)

Kindly answer question a & b

Answer Q37, 38, 39