Novel synthesis and vibrational analysis of (arene)osmium(II) complexes of the type [(C6H3(CH3)3)OsH2(L)]
摘要:
The dihydridoosmium(II) complexes [(mes)OSH2(L)] (mes = C6H3(CH3)3; L = CO, 4; CNCH3, 5) have been prepared in nearly quantitative yields from [(mes)OsCl2(L)] (L = CO, 1; CNCH 3, 2) and Mg/Hg in THF in the presence of C2H5OH as a proton source. These complexes are suitable for studies of C-H activation by UV irradiation in solution. The FT-IR and Raman spectra of 4 and 5 have been recorded in the range between 400 and 3300 cm-1 and between 100 and 3300 cm-1, respectively; a complete assignment of the observed vibrational modes is presented, supported by polarized Raman spectra. The Os-ligand vibrations of half sandwich complexes of this type have been determined for the first time. A normal coordinate analysis of the osmium-ligand modes has been performed by treating the ring ligand as a point mass. Force constants and potential energy distributions are given.
Reaktionen von [(Mes)Os(CO)C12] mit alkyl-grignardreagenzien: Ein einfacher weg zu carbonyl(olefin)osmium(0)-komplexen
作者:Ulrich Wecker、Helmut Werner
DOI:10.1016/0022-328x(92)83150-g
日期:1992.2
[(MeS)Os(CO)Cl2] (2) and RMgX, both dialkylosmium(II) complexes [(Mes)OsR2(CO)] (7: R = C2H5; 10: R = n-C3H7; 12: R = i-C3H7; 14: R = n-C4H9) and alkyl(halogeno)osmium(II) derivatives [(Mes)OsR(CO)X] (6: R = C2H5, X = I; 9: R = n-C3H7, X = I; 11: R =i-C3H7, X = I; 15: R = n-C4H9, X = I; 16: R = CH2CH2Ph, X = Br) have been prepared. It is shown that the type of Grignardreagent has a significant influence on the course
从[(MeS)Os(CO)Cl 2 ](2)和RMgX,两个二烷基os(II)络合物[(Mes)OsR2(CO)](7:R = C 2 H 5 ; 10:R = nC 3 H 7 ; 12:R = iC 3 H 7 ; 14:R = nC 4 H 9)和烷基(卤代)os(II)衍生物[(Mes)OsR(CO)X](6:R = C 2 H 5, X = I; 9:R = nC 3 H 7,X = I; 11:R = iC 3 H 7,X = I; 15:R = nC 4 H 9,X = I;n = 1。16:已经制备了R = CH 2 CH 2 Ph,X = Br)。结果表明,格氏试剂的类型对反应过程有重大影响:而从2和iC 3 H 7 Mgl出发,除了二碘化合物[(Mes)Os(CO)I 2 ](8)之外,烷基(碘代)络合物11上形成的相应的反应2与IC 3 ħ 7 MGX引线主要(X =溴)或完全(X
Vinlyliden-Übergangsmetallkomplexe
作者:H. Werner、S. Stahl、W. Kohlmann
DOI:10.1016/0022-328x(91)86154-i
日期:1991.5
. The monohydrido compounds (Mes)OsH(L)Cl (L = PMe3. PiPr3, PPh3, DMSO) are obtained from (Mes)Os(L)Cl2 by three different routes. Reaction of (Mes)OsH2(PMe3) weith HBF4 at −78°C in ether gives the BF4 salt of the cation [(Mes)OsH3(PMe3)]+, which according to the T1 value of > 2 s has a “classical” hydride structure. On protonation of (Mes)OsH(PiPr3)Cl with HBF4, the coordinatively unsaturated cation