Magnetic susceptibility and the spin-only formula
المؤلف:
CATHERINE E. HOUSECROFT AND ALAN G. SHARPE
المصدر:
INORGANIC CHEMISTRY
الجزء والصفحة:
2th ed p 579
28-11-2016
1244
Magnetic susceptibility and the spin-only formula
We begin the discussion of magnetochemistry with the socalled spin-only formula, an approximation that has limited, but useful, applications. Paramagnetism arises from unpaired electrons. Each electron has a magnetic moment with one component associated with the spin angular momentum of the electron and (except when the quantum number l = 0) a second component associated with the orbital angular momentum. For many complexes of first row d-block metal ions we can ignore the second component and the magnetic moment, μ , can be regarded as being determined by the number of unpaired electrons, n (equations 1.1 and 1.2). The two equations are related because the total spin quantum number S = n/2.
(1.1)
(1.2)
The effective magnetic moment, μeff, can be obtained from the experimentally measured molar magnetic susceptibility,
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