(a) One research method used in inorganic chemistry involves the use of Nuclear Magnetic resonance (NMR) spectroscopy. (i) Describe the chemical theory behind the F-19 NMR in inorganic spectroscopy. [5]
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![(a) One research method used in inorganic chemistry involves the use of Nuclear Magnetic
resonance (NMR) spectroscopy.
(i)
Describe the chemical theory behind the F-19 NMR in inorganic spectroscopy.
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- The spin quantum number of a nitrogen-14 nucleus isI= 1. What would be the nuclear magnetic resonance spectrum for a proton resonance line that was split by interactionwith (a) two. (b) three equivalent nitrogen-14 nuclei?You have two solutions of the same compound that are blue. one is very pale and the other is very intense. Absorbance of each solution was measured with a spectrophotometer at the same wave length at which the solution absorbs. (A) Which solution has the higher absorbance? (B) Which is the more concentrated solution?(5) A sample of sodium phosphate is dissolved in water to give 100.00 mL of solution (Solution A). Then this solution is diluted 5 times to give the final solution (Solution B). Solution B is Known to contain 3.920 x 1022 number of PO43- ions, which has an absorption peak at 460 nm and absorbance value of 0.355 in a 1.000 cm cuvette. (i) Calculate the molar absorptivity of Solution B. (ii) What mass of sodium phosphate (MM 163.94 g/mol) dissolved in Solution A.
- 5. (a) The Mossbauer effect depends upon the recoilless emission of a y-ray. How important is it to embed the emitter nucleus in a bulky and rigid crystal lattice? (b) Briefly describe the isomer shift in Mossbauer spectroscopy.Briefly, but informatively, explain the following as encountered in analytical chemistry: (i) Photoelectric effect (ii) K−absorption edge (iii) Dead time of a detector2. Draw a diagram of energy levels in the EPR spectrum in each of the following cases and specify the number of transfers. (A) A system with S 5/2 in the absence of zero field splitting (B) A system with S 5/2 with small zero field splitting (C) A system with S 5/2 with large zero field splitting (D) A system with S = 3/2 (for electron spin) in interaction with a nucleus with spin I 3/2
- Singly-ionized carbon atoms are accelerated through 1050 V and passed into a mass spectrometer to determine the isotopes present. The magnetic field strength in the spectrometer is 0.180 T. (a) Determine the orbital radii for the 12C and 13C isotopes as they pass through the field. cm (12C) cm (13C) (b) Show that the ratio of the radii may be written in the form m1 = V by verifying that your radii in part (a) satisfy this formula. m1 m-Which atomic spectroscopy is a more preferred method in the analysis of trace levels (such as ppb levels) of iron and calcium in a food sample? Briefly explain your answer.(A) Calculate the wavelength in nm of an emission line of cadmium with a frequency of 1.311 x 1015 Hz. (B) Calculate the wavenumber in cm-1 of an infrared absorption peak with an associated energy of 5.656 x 10-20 J. Report answers to 4 sig figs
- (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?Predict what you expect to observe in the EPRspectrum of a species in which an unpaired electroninteracts with one 14N nucleus (I = 1) and one 1Hnucleus (I = 1/2) if the hyperfine coupling constantsare (a) A(14N) = A(1H)=30 G; (b) A(14N)= 30 G,A(1H)= 10 G.Absorbance at 453 nm 8393939 7 fl. oz./20 ml Beer-Lambert's Law (Spectrophotometry) #1 Fe (aq) + KSCN(s) FESCN "(aq) + K" (aq) 3+ To determine the moles of Fe (aq) in a 100. mL sample of an unknown solution, excess KSCN(s) is added to convert all the Fe (aq) into the dark red species FeSCN"(aq), as represented by the equation above. The absorbance of FESCN"(aq) at different concentrations is shown in the graph below. 2+ 0.50 目0.40 0.30 0.20 01 0. 0. 5 x 10-5 10 x 10-5 Concentration of FESCN2+ (M) If the absorbance of the mixture is 0.20 at 453 nm, haw many moles of Fe (aq) were present in the 100. mL sample? (Assume that any volume change due to adding the KSCN(s) Iis negligible.) 3+, 4x10-4 mol 3 x 104 mol (B) 4x 10-6 mol 3x 10-6 mol
