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- (d) Explain, why [Co(H,O)62+ is pale pink 2 max = 10 cm mol-) la12- whereas C C1 is deep'blue (Emax = 600 cm mol). (3) %3D max Predict the possible transitions in cach case.Q5. The following isomers were obtained for a cobalt complex. How you would distinguish them with the help of vibrational spectroscopy? Calculate IR and Raman active bands for both the isomers in region 1700-2000 cm? OC m co oc Isomer I Isomer IIWhat are 2 most unique aspect of NMR, UV spectroscopy , IR spectroscopy, and Mass Spectroscopy
- (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.Starting material was [(Me5dien)CoCl2] and reacted with SCN to produce [(Me5dien)Co(SCN)2]. Using the two graphs given below how does the shifts in lamdamax for the observed peaks support your notion that Cl has been replaced with N? [(Me5dien)CoCl2] Peak A: 531.8 nm, 0.722 Abs Peak B: 609.7 nm, 0.666 Abs [(Me5dien)Co(SCN)2] Peak A: 510.2 nm, 0.357 Abs Peak B: 608.10 nm, 0.401 Abs(a) symmetry of each. Draw the possible isomers of Ru(CO)4F2 and determine the point group (b) How many infrared and Raman active vibrations are expected for the Co stretching motions in each isomer? (c) stretching motions in each isomer? How many infrared and Raman active vibrations are expected for the Ru-F
- The IR absorption spectrum of CrO2 has a strong band at 975 cml and weaker bands at 921 cm- and 220 cm-1. Assign the observed vibrations to i) O-Cr-O antisymmetric stretch ii) O-Cr-O symmetric stretch iii) bend Based on the spectrum, is CrO2 linear or bent? Explain. A weak absorption is also observed at 1940 cm1. What is this vibration due to? (Assign the vibration)(b) Based on the following reactions, 1. OsO4 F 2. NaHSO3, H2O 1. O3 G 2. Zn, H20 (1) propose the structures of F and G. (ii) determine the important absorption bands with their approximate wavenumber (cm1) in the IR spectra of the products (F and G) compared to their starting materials.(a) Determine the number and activities of the carbonyl stretching modes of both the cis and trans isomers of L2M(CO)4. (b) Calculate the IR and Raman active carbonyl vibrations for both isomers. (c) Fe(CO)4C12 has IR bands at 2167, 2126 and 1082 cm-1 in CHC13 solution. How would you interpret this spectrum?
- How many IR absorption bands are there for cis-[PtCl2(NH3)] in the Pt-Cl stretching region? 2Arrange the following compounds according to decreasing Amax for to * transition observed in UV-Vis spectroscopy. -OH -NH₂ 3 1>2>3>4 2>4>1>3 3>2>1> 4 TOUD 3>1>2>4 HDThe UV-vis. absorption spectrum of an aqueous solution of [Mn(OH2)6]2* displays a large number of d-d absorption bands in the visible region (all ɛ < 0.1 M-1 cm-1). i) Determine the Russell-Saunders ground state term for the Mn(II) free ion. Show your working. ii) Write down the selection rules that govern electronic transitions. iii) With reference to part ii), explain the magnitude of the molar absorption coefficients for [Mn(OH2)6]2*. To illustrate your answer, show that one of the excited state terms for Mn(II) free ion is 4G.