Magnetic Interactions

Although we shall not treat magnetic interactions, the reader should be aware that small magnetic hyperfine

TABLE XXVII Comparison of eQq (in MHz) for a Chlorine (35Cl) Nucleus in Various Molecules

Molecule

eQq

ClF

-145.9

Cl (atomic)

-109.74

BrCl

-102.4

ICl

-85.8

ClCN

-83.4

HC^CCl

-79.7

CH3Cl

-74.8

SiH3Cl

-40.0

AgCl

-37.3

TICl

-15.8

AlCl

-8.8

KCl

0

splittings are possible in singlet electronic ground states and have been observed. This arises from the interaction (M =- (l ■ H) of the nuclear spin magnetic moment (l and a weak magnetic field H generated by rotation of the molecule. Hence, H is proportional to the angular momentum. High-resolution techniques are required to observe the small magnetic splittings required for evaluation of the nuclear magnetic coupling constants. The theory for combined nuclear quadrupole and magnetic hyperfine interactions has been developed. For CH2O, the observed hyper-fine structure arises solely from the magnetic moments of the two protons, since neither hydrogen nor oxygen has a quadrupole moment. On the other hand, for CHDO there is a quadrupole interaction from D which has a quadrupole moment as well as a magnetic interaction from the nuclear spins of H and D.

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