Chem 202 - 16.11 Magnetic Properties of Complexes

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Created by:

RheaWong  on November 24, 2011

Subjects:

chem 202, chemistry

Description:

9/30/211
Transition metal spectroscopy, backbonding, crystal fields.

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Chem 202 - 16.11 Magnetic Properties of Complexes

Paramagnetic
A property of a substance with unpaired electrons; a paramagnetic object gets pulled into a magnetic field.
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Definitions

Paramagnetic A property of a substance with unpaired electrons; a paramagnetic object gets pulled into a magnetic field.
Diamagnetic A property of a substance with no unpaired electrons; a diamagnetic object gets pushed out of a magnetic field.
The Magnetism of Complexes Most complexes are paramagnetic to some degree, with at least one unpaired electron present.
Weak-field ligands and Magnetism Weak-field ligands will add one electron to each d-orbital before doubling up, and will tend to be strongly paramagnetic as a result.
Strong-field ligands and Magnetism Strong-field ligands will pair electrons in tg obitals before filling eg orbitals, and will tend to be weakly paramagnetic as a result.
16.11 Summary The magnetic properties of a complex depend on the magnitude of the ligand field splitting. Strong-field ligands tend to form low-spin, weakly paramagnetic complexes; weak-field ligands tend to form high-spin, strongly paramagnetic complexes.

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