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DOI: 10.3791/64160-v
Line shape analysis of NMR spectra collected over a range of temperatures serves as a guide for the rearrangement of inner coordination-sphere atoms at a chiral, eight-coordinate, rhenium(V) polyhydride complex, ReH5(PPh3)2(sec-butyl amine). Line shape analysis is also used to determine the activation parameters ΔH‡, ΔS‡, and ΔG‡ for those atom rearrangements.
This method examines the dynamic behavior of the eight atoms that are bound to a central metal atom through line shape fitting of dynamic NMR spectrum. The visual nature of the line shape fitting technique allows for ready development of dynamic exchange models in comparisons of the model results with the observed spectra. Line shape fitting of NMR spectra is a method that is used to investigate a variety of dynamic molecular processes with activation energies in the range of 5 to 25 kilocalories per mole.
I would expect novice users to have questions regarding how to complete the inputs for the line shape fitting application. Practicing on the application, especially with an experienced user, is helpful. To begin, combine 0.15 grams of sodium borohydride and 0.41 grams of oxotrichlorobis triphenylphosphine rhenium-V in a two-or three-necked 100-milliliter round-bottom flask fitted with the rubber septum and gas port, or a 100-milliliter Kjeldahl flask fitted with a rubber septum.
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