Cluster compounds containing a linear carbon chain derived from polyynediyl and polyynyl complexes, Fp(CC) nX [X=Fp, H; Fp=Fe(η 5-C 5Me 5)(CO) 2]

• Published in: Journal of Organometallic Chemistry Vol. 670; no. 1; pp. 2 - 10
• Main Authors: Akita, Munetaka, Sakurai, Aizoh, Chung, Min-Chul, Moro-oka, Yoshihiko
• Format: Book Review Journal Article
• Language: English
• Published: Elsevier B.V 01.03.2003
• Subjects: Cluster compounds; Linear carbon chain; Polyynediyl complexes; Linear carbon chain; Polyynediyl complexes; Cluster compounds
• ISSN: 0022-328X; 1872-8561
• DOI: 10.1016/S0022-328X(02)02067-3

Our studies on polynuclear complexes containing a one-dimensional carbon chain derived from polyynyl [Fp*(CC) n H 1 n ] and polyynediyl complexes [Fp*(CC) n Fp* 2 n ; Fp*=FeCp*(CO) 2] are reviewed. Reaction of 1 n and 2 n with di- and trinuclear metal carbonyl species produces polycarbon–polymetal systems with a variety of coordination structures including η 2-alkyne, μ-acetylide, μ-cumulenylidene, μ 3-alkylidyne and μ 3-propargylidene structures. In addition to the cluster formation reactions as usually observed for acetylide and alkyne cluster compounds, the unique cluster transformations such as valence isomerization of the conjugated carbon chain, metal migration along the carbon rod and CC cleavage reaction are observed. These transformations are realized by the flexible electronic structure of the π-conjugated carbon chain (polyynyl↔cumulenic), which fits the electronic structure of the attached metal fragments. Reaction of polyynyl [Fp*(CC) n H] and polyynediyl complexes [Fp*(CC) n Fp*; Fp*=FeCp*(CO) 2] with di- and trimetallic carbonyls results in not only formation of cluster compounds with alkynyl and cumulenic carbon chains but also unique cluster transformations such as valence isomerization of the conjugated carbon chain, metal migration along the carbon rod and CC cleavage reaction.