Why all the bonds are not equivalent in if7

1.	Why all the bonds are not equivalent in if7
Answer» Well, you got a seven-coordinate IODINE CENTRE, whose COORDINATION geometry is pentagonal bipyramidal. You will have to consult your text, but I think at ROOM temperature, this structure is conformationally mobile, i.e. there is a SOFT energy of exchange between axial and equatorial positions, and thus say the NMR spectrum would display a SINGLET. Below room temperature (quite possibly well below) the spectrum would resolve into two absorptions…corresponding to axial and equatorial positions…

Answer»

Well, you got a seven-coordinate IODINE CENTRE, whose COORDINATION geometry is pentagonal bipyramidal. You will have to consult your text, but I think at ROOM temperature, this structure is conformationally mobile, i.e. there is a SOFT energy of exchange between axial and equatorial positions, and thus say the NMR spectrum would display a SINGLET. Below room temperature (quite possibly well below) the spectrum would resolve into two absorptions…corresponding to axial and equatorial positions…

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