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Ambient Temperature Alkali Metal Transfer in Hydrocarbons - A New Route to Intercalation Compounds and Alloys

Published online by Cambridge University Press:  15 February 2011

J.O. Besenhard
Affiliation:
Inorganic Chemistry Institute, Technical University of Munich, Lichtenbergstr. 4, D-8046 Garching, West Germany
I. Kain
Affiliation:
Inorganic Chemistry Institute, Technical University of Munich, Lichtenbergstr. 4, D-8046 Garching, West Germany
H.-F. Klein
Affiliation:
Inorganic Chemistry Institute, Technical University of Munich, Lichtenbergstr. 4, D-8046 Garching, West Germany
H. MöHwald
Affiliation:
Inorganic Chemistry Institute, Technical University of Munich, Lichtenbergstr. 4, D-8046 Garching, West Germany
H. Witty
Affiliation:
Inorganic Chemistry Institute, Technical University of Munich, Lichtenbergstr. 4, D-8046 Garching, West Germany
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Abstract

Dissolved cobalt(0) complexes of the type [L3L'Co] (L = phosphanes, e.g. PMe3, L' = olefins, e.g. C2H4) are reversibly reduced by alkali metals A (A = Li, K, Rb, Cs)

n[L3L'Co] + A ⇋ A[L3L'Co]

and hence can be used as A-carriers. These carrier complexes A[L3L'Co]n are even soluble in apolar solvents like pentane.

Action of [L3L'Co] plus A in pentane solution on graphite yields binary intercalation compounds ACn. By contrast, conventional ambient temperature A-transfer reagents (e.g. solutions of A in naphthalene-ether or in NH3) require strongly polar solvents and yield ternary intercalation compounds A(solv)yCn.

The “reducing power” of the alkali cobaltates is close to that of free A: alkali-rich phases like 1st stage KC8 or LiC6 or highly doped polyacetylenes (e.g. K(CH)5) are readily prepared. If intercalation of solvated species is unlikely, the A-transfer reactions may also be performed in polar solvents like ethers.

Type
Research Article
Copyright
Copyright © Materials Research Society 1983

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