HW 1 Multinuclear NMR Name:
Points: C6800 Date:
Max. 100 points Spring 2018 Version A
1. (10 points) Show that Emag =  µ  B0 =  µz  B
2. (15 points) Consider symmetry properties of following molecules. Find symmetry elements
and give their point group labels. How many signals would you expect in the 31
P NMR
spectra.
3. (10 points) Calculate the energy difference between the spin levels inside a 950 MHz
magnet for a 3
H nucleus.
4. (10 points) Calculate the excess of nuclei on the lowest energy level of 3
H at 300 K and 173 K.
5. (25 points) Octahedral complexes Sn(2-PyCHCOCF3)2(Ot
Bu)2 may form several
geometrical isomers. Find all of them, draw their geometrical formulas (ligand 2PyCHCOCF3
schematically), and give their symmetry point group labels.
6. (10 points) How many signals would you expect in the 19
F NMR spectra for each isomer?
7. (10 points) How many signals of t
BuO groups would you expect in 13
C NMR spectra for
each isomer?
8. (10 points) How many signals would you expect in the 19
F and 31
P NMR spektra and why?
O
PN
O
O
P
P
O
O
F
F
F
F
Chelating ligand 2-PyCHCOCF3 may
be schematically drawn as ON