(1), which was identified by comparison of experimental and calculated (BLYP-6-31G*) IR spectra for both, unlabeled 1 and its perdeuterated isotopomer. Upon irradiation of matrix-isolated silylsilacyclopropenylidene (1) a second C2H4Si2 isomer, namely (silylethynyl)silylene (4) was formed. However, no evidence could be found for the formation of disilatetrahedrane or 1,2- or 1,3-disilacyclobutadiene
脉冲闪热解在组合具有三个前体分子(的基质隔离10,11,12导致形成silylsilacyclopropenylidene的()1),其被鉴定通过实验的比较和计算的(BLYP-6-31G *)IR光谱两者,未标记的1及其全氘化的同位素。在基质分离的甲硅烷基硅烷基环丙烯基(1)的照射下,形成第二种C 2 H 4 Si 2异构体,即(甲硅烷基乙炔基)亚甲硅烷基(4)。然而,没有发现形成二硅四面体或1,2-或1,3-二硅环丁二烯的证据。
Time-resolved studies of the temperature dependence of the gas-phase reactions of methylsilylene with silane and the methylsilanes
作者:Rosa Becerra、H. Monty Frey、Ben P. Mason、Robin Walsh
DOI:10.1039/ft9938900411
日期:——
initio theory (for the reaction of SiH2 with SiH4) these show that the electrophilic interaction probably precedes the nucleophilic interaction, although the latter is important in the rate-determining (second) step for the insertion reactions of both MeSiH and SiMe2. Combination of MeSiH insertion rate constants with the reverse unimolecular decomposition rate constants of the product disilanes enable the
solution of 3b at 100 °C resulted in a similar dimerization to 4b. In addition, a trinuclear platinum complex [Pt3(dppe)3(μ3-SiPh)2] (5) with a trigonal bipyramidal Pt3Si2 core arose from the reaction of 4c with 1 at 60 °C in toluene. Unsymmetric disilanes therefore accomplished the syntheses of various monomeric and dimeric platinum complexes via 1,2-hydrogen and silylmigration to the platinum center
零价 铂络合物[铂(DPPE)(η 2 -C 2 H ^ 4)](1,dppe = 1,2-双(二苯基膦基)乙烷)经乙硅烷HR 1 R 2 SiSiMe 3(a,R 1 = R 2 = Me; b,R 1 = R 2 = Ph; c,R 1 =H,R 2 = Ph)通过将Si-H键氧化加至铂中心得到相应的二硅烷基氢化铂[Pt(dppe)(H)(SiR 1 R 2 SiMe 3)](2a–c)。这1,2-甲硅烷基2a,b的迁移导致形成双(硅烷基)铂络合物[Pt(dppe)(SiHR 1 R 2)(SiMe 3)](3a,b)在25°C下2a和3.86(的一阶速率常数为7.2(2)×10 -4 s -1 4)×10 -4 s -1在40°C下2b,而2c且R 1 =H然后瞬间生成3c的三聚体迅速生成二(μ-亚甲硅基)二铂络合物[Pt(dppe)(μ-SiHPh)] 2(4c)为顺式/反式异构体
Maier, Guenther; Reisenauer, Hans Peter; Pacl, Harald, Angewandte Chemie, 1994, vol. 106, # 12, p. 1347 - 1349
作者:Maier, Guenther、Reisenauer, Hans Peter、Pacl, Harald
DOI:——
日期:——
Silacyclopropyne: Matrix Spectroscopic Identification and ab Initio Investigations
作者:Guenther Maier、Harald Pacl、Hans Peter Reisenauer、Andreas Meudt、Rudolf Janoschek
DOI:10.1021/ja00156a008
日期:1995.12
Matrix-isolated 1-silacyclopropenylidene (7) has been generated by pulsed flash pyrolysis of 2-ethynyl-1,1,1 -trimethyldisilane (4). By subsequent photolysis 7 can be isomerized into ethynylsilanediyl (5), vinylidenesilanediyl (8), and silacyclopropyne (9). The identification of the C2H2Si isomers and their C-13 and D isotopomers is based on the comparison of their experimental and calculated (MP2/6-31G**) infrared spectra. In case of 9, the first example of a ''formal'' cyclopropyne, the definitive assignment of the structure was only possible by studying C-13 isotopomers. Detailed ab initio calculations have been carried out in order to understand the unique bonding situation in 9. It is found that the Lewis structure 9B, where the dashed line indicates an electron pair which occupies a CC nonbonding orbital, is the best possible compromise to describe the electronic structure of 9 correctly. The value of 6.2 kcal mol(-1) for the barrier of 9 to the planar transition structure 13 represents the lowest inversion barrier of tetra-coordinated silicon described so far.