Extended Hückel molecular orbital study of the effects of edge-bridging hydrogen atoms on the lengths of boron–boron and metal–metal bonds in cluster compounds, and the crystal structure of benzyltrimethylammonium octahydrotriborate(1–)

1987 ◽  
pp. 1017-1025 ◽  
Author(s):  
Gary F. Mitchell ◽  
Alan J. Welch
Keyword(s):  
Crystal Structure ◽  
Molecular Orbital ◽  
Cluster Compounds ◽  
Hydrogen Atoms ◽  
Molecular Orbital Study ◽  
Extended Hückel ◽  
Orbital Study ◽  
Metal Metal ◽  
Metal Metal Bonds ◽  
Metal Bonds

Öffnung von Dreikernclustern durch Diphosphinomethan-Liganden / Opening of Trinuclear Clusters by Diphosphinomethane Ligands

1989 ◽  
Vol 44 (2) ◽  
pp. 139-144 ◽  
Author(s):  
Roy P. Planalp ◽  
Heinrich Vahrenkamp
Keyword(s):  
Crystal Structure ◽  
Structure Determination ◽  
Addition Product ◽  
Crystal Structure Determination ◽  
Metal Metal ◽  
Trinuclear Clusters ◽  
Metal Metal Bonds ◽  
Metal Bonds

Abstract The phosphinidene bridged clusters FeCo2(CO)9(PMe) and FeCoWCp(CO)8(PM e) add the diphosphinomethane ligands dmpm and dppm with concomitant opening of two metal-metal bonds. The crystal structure determination of the addition product (Me2P-CH2-PMe2)FeCoWCp(CO)8(PMe) has shown that the Fe -W and Fe -Co bonds have been opened and the chelating diphosphine spans the Co -W bond. This is in contrast to the reaction with monodentate phosphines where the Co -W and Co -Fe bonds are broken. Upon heating the addition products eliminate two moles of CO with formation of the diphos­ phinom ethane substituted starting clusters, which in turn add CO under pressure to re-form the addition products.

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