A new approach to the synthesis of carbon chains capped by metal clusters

• Published in: Journal of organometallic chemistry Vol. 670; no. 1; pp. 170 - 177
• Main Authors: Bruce, Michael I, Smith, Mark E, Zaitseva, Natasha N, Skelton, Brian W, White, Allan H
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 17-03-2003
• Subjects: C 10 chains; Capped clusters; Carbon chains; Cobalt clusters; Cobalt clusters; Capped clusters; Carbon chains; C 10 chains
• ISSN: 0022-328X; 1872-8561
• DOI: 10.1016/S0022-328X(02)02186-1

Reactions of Co
3(μ
3-CBr)(μ-dppm)(CO)
7 with {Au[P(tol)
3]}
2{μ-(CC)
n
} (
n=2–4) have given {Co
3(μ-dppm)(CO)
7}{μ
3:μ
3-C(CC)
n
C} [
n=2 (
1), 3 (
2), 4 (
3)] containing carbon chains capped by the cobalt clusters. Tetracyanoethene reacts with
2 to give {Co
3(μ-dppm)(CO)
7}
2{μ
3:μ
3-C(CC)
2C[C(CN)
2]C[C(CN)
2]C} (
4). X-ray structural characterisation of
1,
3 and
4 are reported, that for
3 being the first of a cluster-capped C
10 chain.
Elimination of AuBr{P(tol)
3} in the reaction between Co
3(μ
3-CBr)(μ-dppm)(CO)
7 and {Au[P(tol)
3]}
2{μ-(CC)
n
} (
n=2–4) affords novel cluster-capped carbon chains {Co
3(μ-dppm)(CO)
7}
2{μ
3:μ
3-C(CC)
n
C}, of which the X-ray structures of
n=2, 4 are reported. The reaction between C
2(CN)
4 and
n=3 gives {Co
3(μ-dppm)(CO)
7}
2{μ
3:μ
3-C(CC)
2C[C(CN)
2]C[C(CN)
2]C} (illustrated).