(a) Sn3N4, y-Si3N4 and y-Ge3N4 are the first examples of nitride spinels. What is a spinel, and how do the structures of these nitrides relate to that of the oxide Fe3O4? Comment on any features that distinguish the nitride spinels from typical oxide analogues.
(b) The reaction between O3 and AsCI} at 195 K leads to an As(V) compound A. Raman spectra of A in CH2CI2 solution are consistent with a molecular structure with C3v symmetry. However, a singlecrystal X-ray diffraction study of A at 153K reveals a molecular structure with C2i, symmetry. Suggest an identity for A and rationalize the experimental data. .
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