ISSN:
0018-019X
Schlagwort(e):
Chemistry
;
Organic Chemistry
Quelle:
Wiley InterScience Backfile Collection 1832-2000
Thema:
Chemie und Pharmazie
Notizen:
Assembly of Tetranuclear Ruthenium Complexes with Planar Metal Core by Condensation of Two Diruthenium Units Using Bridging Ligands: Synthesis and Molecular Structure of [Ru4(CO)8{μ2-P(Cy)2}4] and [Ru4(CO)8{μ4-P(Cy)}2{μ2}2](Cy = Cyclohexyl)The dinuclear complexes [Ru2(CO)6{μ-P(Cy)2}2] (1) or [Ru2(CO)4{μ-(HCO2)}2{P(Cy)2H}2] (2) react in THF solution at 160° to give the tetranuclear complexes [Ru4(CO)8{μ2-P(Cy)2}4] (3) and [Ru4(CO)8{μ4-P(Cy)}2{μ2-P(Cy)2}2] (4), as well as the trinuclear complex [Ru3(CO)7(μ2-H){μ2-P(Cy)2}3] (5). If the reaction is performed at 200°, the bicapped tetranuclear species 4 is obtained in a higher yield, whereas 3 and 5 are formed in trace amounts only. The phenyl derivatives [Ru2(CO)6{μ-P(Ph)2}2] (6) or [Ru2(CO)4{μ-(EtCO2)}2{P(Ph)2H}2] (7) react in a similar manner to give only the complex [Ru4(CO)8{μ4-P(Ph)}2{μ2-P(Ph)2}2] (8), analogous to 4. The molecular structure of 3 consists of a planar framework of four Ru-atoms, each Ru - Ru bond being bridged by a μ2-dicyclohexylphosphino ligand. The complex 4 represents a planar rectangular Ru core, both faces being capped by μ4-cyclohexylphosphinidene ligands and two opposite edges being bridged by μ2-dicyclohexylphosphino ligands.
Zusätzliches Material:
3 Ill.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1002/hlca.19940770213
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