Record NMR shift in metal-bound phosphorus
Second record for iron complex as chemical shift beyond –10,000ppm discovered in phosphorus atoms directly bound to the metal
A phosphorus nuclear magnetic resonance shift beyond –10,000ppm has been discovered, setting a record in solution NMR spectroscopy. The extreme resonance frequency comes from two phosphorus atoms directly bound to iron in a metal complex. It is, in fact, the same complex that was found to have a record proton NMR shift a few years back.