Monday, April 24, 2006

NMR of metals, molecular clusters, zeolites

"NMR in metals, metal particles and metal cluster compounds" by van der Klink, J.J.; Brom, H.B. Prog. Nucl. Magn. Reson. Spectrosc. 2000, 36, 89.

A review with 243 refs. about the ways to deduce the electronic states of bulk metals, small metal particles, and the metal cores in metal cluster compds. by NMR. First, a theory of the NMR parameters is developed which is governed by the Fermi contact interaction between nuclear and electronic spins using the concept of nonlocal susceptibility. Going from mols. to solids and esp. metallic solids, the simple Korringa relation which connects the relaxation rates to the Knight shift and temp. has to be modified due to ferro- or antiferromagnetic interactions. NMR phenomena of alkali metals, noble metals (Cu, Ag, Au), and some transition metals (Cd, Mn, Pt, Pd) are treated. The consequences for the NMR linewidth and relaxation rates are discussed going from the bulk metal to small particles. Exptl. findings are presented for small particles of Cu, Ag, Pt, Rh, Pt-Pd alloys, zeolites, sodalites, clathrates, and metal cluster compds.

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