The compounds SenS8-n_„ with n = l-5 are structurally similar to S8. Structure 4.19 shows...

The compounds SenS8-n_„ with n = l-5 are structurally similar to S8. Structure 4.19 shows a representation of the S8 ring (it is actually non- planar) and the atom numbering scheme; all the S atoms are equivalent. Using this as a guide, draw the structures of SeS7, l,2-Se2S6, l,3-Se2S6, 1,2,3- Se3S5, l,2,4-Se3S5, l,2,5-Se3S5 and l,2,3,4-Se4S4. How many signals would you expect to observe in the 77Se (I = , 7.6%) NMR spectrum of each compound?