Worksheet: NMR Splitting Patterns
In this worksheet, we will practice determining molecular structure from NMR splitting patterns and assigning multiplicities based on peak intensities.
A NMR spectrum at room temperature reveals one well-defined peak. When cooled slightly, the peak becomes broadened. At temperature, two well-defined peaks are apparent. What is responsible for these observations?
- AInteger quantum spin numbers
- BSpin–spin coupling interactions
- CLow natural abundances of the nucleus
- DFractional quantum spin numbers
- EDynamic fluxionality
What is the most likely cause of fluxional behavior in the NMR spectrum of , iron pentacarbonyl?
- ADissociation and recoordination of the carbonyl ligands
- BOpening and closing of bridging carbonyls
- CMonomer-dimer formation with a bridging carbonyl
- DRotation of a hindered carbonyl bond
- EIsomerism between trigonal bipyramidal and square pyramidal configurations