64519-62-6Relevant articles and documents
Synthesis of the square-bipyramidal cluster 4-SiMe)2(CO)11> by two routes and its reaction with GeMe2H2. The crystal structures of 4-SiMe)2(CO)11> and 4-SiMe)2(CO)10>
Anema, Skelte G.,Lee, Siew Kim,Mackay, Kenneth M.,Nicholson, Brian K.
, p. 211 - 218 (1993)
4-SiMe)2(CO)11> (1a) is the major product from the reaction of with (synthesised from SiMeH2Cl and Na2).An alternative, quantitative synthesis of 1a is from SiMeH3 and , 1a reacts with an
Synthesis, crystal structure and hydroformylation activity of triphenylphosphite modified cobalt catalysts
Haumann, Marco,Meijboom, Reinout,Moss, John R.,Roodt, Andreas
, p. 1679 - 1686 (2007/10/03)
The dinuclear complex [Co2(CO)6{P(OPh) 3}2] (2) has been synthesised and was fully characterised. The solid state structure revealed a trans diaxial geometry, no bridging carbonyls, and Co-Co and Co-P bond lengths of 2.6722(4) and 2.1224(4) A, respectively. Catalysed hydroformylation of 1-pentene with 2 was attempted at temperatures in the range 120 to 210°C and pressures between 34 and 80 bar. High pressure spectroscopy (HP-IR and HP-NMR) was used to detect hydride intermediates. High pressure infrared (HP-IR) studies revealed the formation of [HCo(CO)3P(OPh)3] (4) at ca. 110°C, but at higher temperatures absorption bands corresponding to [HCo(CO)4] (3) were observed. The hydride intermediate 4 has also been synthesised and characterised. Upon increased ligand concentration, HP-IR studies showed the formation of new carbonyl absorption bands due to a higher substituted cobalt carbonyl complex-[HCo(CO)2{P(OPh)3}2] (5), which is believed to be catalytically less active. Complex 5 has been synthesised independently and was fully characterised. A low temperature crystal structural study of 5 revealed a trigonal bipyramidal structure with a trans H-Co-CO arrangement and two equatorial phosphite ligands, the Co-P bond lengths being 2.1093(8) and 2.1076(8) A, respectively.
Preparation and structures of mixed silicon-cobalt carbonyl clusters with Si-H, Si-O or Si-S bonds
Tiel, Martin Van,Mackay, Kenneth M.,Nicholson, Brian K.
, p. 79 - 88 (2007/10/02)
Reaction of Si2H6 with 3 molar equivalents of Co2(CO)8 in hexane gives the closo-cluster Co4(μ4-SiCo(CO)4)(CO)11, while with 2, together with an unstable species tentatively identified as OCo2(CO)7>2.Reaction of S(SiH3)2 with Co2(CO)8 gives Co4(μ-S)2(CO)11 and the novel cluster SSi2Co2(CO)14; the latter was shown crystallographically to contain a Co2(CO)6 unit doubly-bridged by two silicon atoms that are in turn linked by the sulphur atom.There is also a terminal Co(CO)4 group attached to each silicon atom.The most notable feature of this structure is an acute Si-S-Si bond angle of 70.3o which leads to a very short formally non-bonded Si...Si distance of 2.498 Angstroem.
