A Novel Coordination Mode of 7-Methyl-7-sila-nido-undecaborate(1−)

Abstract

B-N-M bridges, resulting from the activation of two B,H units, are present in the anion [Nb(MeSiB(10)H(8))(µ-NMe(2))(2)Br(3)](-) (see structure depicted). Thus, this is an example for a hitherto unknown coordination mode in the chemistry of heteroborane clusters.

Reactions of Hydrosilanes with Transition Metal Complexes and Characterization of the Products

“…Structural data reported for silyl−transition metal complexes prepared from hydrosilanes that include both “classical” M−Si, M−H, and/or Si−H bonds and “nonclassical” M···H···Si interactions as well as silylene complexes (formed from hydrosilanes) are summarized in Table and includes entries from Tables , , and as well as additional complexes listed in the footnotes to these tables. Data for Si−TM bond distances reported for silyl−metal complexes prepared by routes that did not involve hydrosilanes and that have been reported in the Cambridge Data Base through Mar 2009 (version 5.30) are recorded in the footnotes to Table . …”

“… 16 Hydrogen atoms were included in calculated idealized positions but not refined 33 17 Nb−Si : 2.5597(5); 143 2.5776(5); 143 2.5782(8); 2.5817(7); 2.586(2); 2.5837(9); 2.585; 2.586(2); 2.5908(10); 2.594(1); 2.595(3); 144 2.5961(5); 2.5969(6); 2.5986(4); 2.5986(4); 2.6038(8); 2.604(2); 142 2.6045(8); 2.6045(8); 2.605(8); 2.6148(9); 2.6167(8); 2.618(1); 142 2.6206(8); 2.622; 142 2.6240(9); 144 2.625(1); 2.6285(9); 144 2.6411(8); 2.6426(2); 2.649; 2.649(2);2.6491(4); 144 2.6522(6); 2.6528(5); 2.6645(6); 2.670(3); 357 2.680(2); 358 2.685(1) 358 . Ta−Si : 2.631; 355 2.645; 355 2.666(3); 359 2.689(1); 360 2.710(4); 2.7167(8); 361 2.722(3); 360 2.726(4); 361 2.754(3); 361 2.809(2) 362 . 18 Table 3, footnote 45 151 …”

Transition metal dicarbollide complexes: synthesis, molecular, crystal and electronic structures of [M(C2B9H11)(NMe2)3] (M = Nb or Ta) and their insertion reactions with CO2 and CS2 †

“…Metal amides have also found use in the synthesis of metal complexes of silaboranes. 14 In common with many other areas of organometallic chemistry, the most extensively used method for co-ordinating C 2 B 9 H 11 to a transition metal has been the elimination of halide salt between a metal halide and either an alkali-metal or thallium salt of [nido-C 2 B 9 H 11 ] 2Ϫ . In recent years the amine elimination reaction 15 has found use as a novel method for co-ordinating ligands, 16 occasionally providing routes to otherwise inaccessible compounds 17 or thermodynamic product ratios.…”

3 Boron

“…The mono and bis-halogen substituted intermediates on this reaction pathway have also been isolated. 120…”