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In the experimental portion of this lab, each pair of students will record the 31P NMR spectrum of a novel Pt compound containing two P atoms that are in chemically inequivalent positions and are strongly coupled to each other. An understanding of the spectrum (which also contains additional features due to those molecules in the sample that contain 195Pt atoms in natural abundance, the only Pt isotope with a nuclear spin, and that have 31P/195Pt nuclear spin-nuclear spin interactions) requires a straightforward but thorough quantum mechanical analysis of the energy levels and transition probabilities of such strongly coupled spin systems.
The molecule is a Pt complex in which a dppe (Ph2PCH2CH2PPh2) bidentate ligand coordinates Pt, which in turn binds cyanoethylene, CH2=CHCN, through the double bond, as shown below. Note that the cyanoethylene ligand causes the two phosphorus nuclei, PA and PB, to be inequivalent.
Click here to see a pdf version of the lab handout (about 86k in size), which goes through the theoretical analysis step by step.
Click here to go to the spectral simulation page which is needed to complete the lab.
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