Question

1. Two types of isomerism are possible for the six-coordinate complex Cr(NO2)2.6H2O. Identify all isomers. (10 Points) 2. The two square-planar isomers of [PtBrCI(PR3)2] (where PR, is a trialkylphosphene) have different 31P-NMR spectra as shown below. For this exercise, we ignore the coupling to 195Pt (I=1/2 at 33% abundance). One isomer (A) shows a single 31P resonance; the other (B) shows two 31P resonances, each of which is split into a doublet by the second 31P nucleus. Which isomer is cis and which is trans? Draw the structures of the two isomers. (20 Points) (a) A isomer (b) B isomer

Answer 1

with pt), But in cis two f non equivalent, So, we get two bear. Since 2 have I - Z So, 21 [ +1 = 2x1x<+1=2 So each peak Split into two peaks. Thus we get following type of spectrum here n=1 TEA U So, Ä in for trans isomer here intensity high for two "Piwe get only one beans 'B' is for cis isamis here intensity low are to generation of two bear