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Fluorine NMR
9 electrons, rather than a single electron as is the case with hydrogen, the range of fluorine chemical ... used to place the paramagnetic center in the molecule, the "assignment" problem is also minimized. ... the system of interest that produces a resolvable and assignable resonance. When such signals cannot
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Chapter 6 Molecular Fluorescence and Phosphorescence
www.philadelphia.edu.jo1. Molecule is paramagnetic in the T excited state and diamagnetic in the S excited state 2. S T transitions (or reverse) are less probable than S S transitions Thus average lifetime of T excited state (10-4 s) is longer than the S excited state (10-5 - 10 8 …