Divalent Carbon(0) Compounds as Promising Ligands in Coordination Chemistry
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- Kubo Kazuyuki
- Department of Chemistry, Graduate School of Science, Hiroshima University
Bibliographic Information
- Other Title
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- 新しい配位子として期待される０価２配位炭素化合物
- アタラシイ ハイイシ ト シテ キタイ サレル 0カ 2ハイイ タンソ カゴウブツ
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Abstract
This contribution describes a brief overview of the chemistry of divalent carbon(0) compounds, carbodiphosphoranes (CDPs) and carbodicarbenes (CDCs), which have currently emerged as an important new class of ligands in coordination chemistry. CDPs, which are often depicted as R3P=C=PR3, assume an extremely bent structure rather than a linear structure expected for the allene-like representation. Recent computational studies revealed that the CDPs have two lone pairs in σ and π symmetry on the central carbon(0) atom, providing a better description of their electronic structures as R3P→C0←PR3, in which the P-C bonds come from donor-acceptor interactions. Allenes with strong electron-donating substituents (E) on the terminal carbons also adopt a bent structure and would be best formulated as CDCs, namely E2C→C0←CE2. The central carbon(0) atom in CDPs and CDCs is highly basic, which allows them to serve as attractive ligands for transition metals. They are stronger donors than N-heterocyclic carbene and phosphine ligands, and might be easy to tune their donor properties.
Journal
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- Bulletin of Japan Society of Coordination Chemistry
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Bulletin of Japan Society of Coordination Chemistry 54 68-70, 2009
Japan Society of Coordination Chemistry