Pyrolyse von Uebergangsmetallkomplexen: Darstellung von Metallcarbiden (MC, M2C) aus metallorganischen Verbindungen

Article abstract of DOI:10.1016/0022-328X(94)05176-C

The following compounds were prepared and their pyrolysis in a stream of argon was studied: 5-C5H5)(CO)2>2 (1), 5-C5H5)(CO)3>2 (2, M=Mo; 3, M=W), 5-C5H5)(CO)2(C<*>CSiMe3)> (4), 5-C5H5)(CO)3(C<*>CSiMe3)> (5 M = Mo; 6, M=W), 5-C5H5)3(CO)7(μ-η^2:2:1-C<*>CSiMe3)> (7), 5-C5H5)2(CO)4(μ-η^2:2-HC<*>CC6H5)> (8), 5-C5H5)2(CO)4(μ-η^2:2-RC<*>C-SiR'R''-C<*>CR> (9a, R=H, R'=R''=CH3; 9b, R=C6H5, R'=H, R''=CH3; 9c, R=C6H5, R'=CH=CH2, R''=C<*>CC6H5), 5-C5H5)2(CO)4(μ-η^2:2-Me3SiC<*>C-C<*>CSiMe3)> (10), 5-C5H5)4(CO)8(μ4-η^2:2:2:2-Me3SiC<*>C-C<*>CSiMe3)> (11).The products of bulk pyrolysis of selected compounds are formed in 20percent-60percent yield, based on the charged sample weight.The ceramic materials obtained consist of metal carbides (MC, M2C) together with small amounts of metal(0) (M=Mo, W) and amorphous carbon.Keywords: Pyrolysis; Preceramics; Ceramics; Iron; Molybdenum; Tungsten