Ebook: Os Organoosmium Compounds: Part B6
- Tags: Gmelin
- Series: Gmelin Handbook of Inorganic and Organometallic Chemistry - 8th Edition O-s / a- / B / 6 : Os. Osmium (System-Nr. 66)
- Year: 1993
- Publisher: Springer-Verlag Berlin Heidelberg
- Edition: 8
- Language: English
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The present volume, "Organoosmium Compounds" 8 6, systematically covers the litera ture through 1992, including many later references. This volume is the first published of Series 8. This series is devoted to compounds containing two or more osmium atoms. The volume forms a unit with" Organoosmium Compounds" 8 5 (in preparation). 80th volumes deal with trinuclear compounds with ligands other than CO which are bonded to Os by one carbon atom ("1L ligands "), regardless of whether the ligand is additionally coordinated to Os by heteroatoms. Generally CO groups are additional ligands. As is usual in the organometallic Gmelin series, the term "trinuclear" means three osmium atoms in the molecule without regard to any additional metals that may be present. The content and the subdivision of both volumes are described on p. 1. Volume 85 will deal with homometallic compounds in which the bonding C atom of the leading 1L ligand is bonded to Os by one non-bridging Os-C bond. The first part of the present volume, 86, is devoted to homometallic compounds in which the bonding C atom of the 1L ligand bridges two or three Os atoms. A second part deals with all heterometallic compounds with 1L ligands other than CO. An Empirical Formula Index and a Ligand Formula Index for both volumes 8 5 and 86 will be included in volume 8 5. For abbreviations and dimensions used throughout this volume, see p. X.
Two thirds of the volume are devoted to triosmium carbonyl compounds, generally containing a triangular Os3 core, in which additional ligands are bonded to osmium by one µ2- or µ3- bridging carbon atoms. Prominent examples of ligands with µ2- bridging carbon atoms are bridging carbenes, but in addition bridging aryl groups or heterocycles. In many cases the ligand is additionally coordinated to osmium by heteroatoms. Almost all ligands with µ3- bridging carbon atoms are of the carbyne type, leading to pseudotetrahedral Os3C molecular cores. The final section deals with heterometallic carbonyl compounds containing additional ligands bonded by one carbon atom, mostly in a bridging manner. Most of the compounds in this volume are structurally well characterized. Their reactions often are accompanied by unexpected rearrangement either of the cluster core or of the ligands.