cis-Tetracarbonyl-1,4-h ²-1,2-bis(phenylphosphino-1,2-dimethyl)disilanemolybdenum(0)

Abstract

(Fo)

New Group 14 Element Substituted Phosphaalkenes

“…In the literature, a few disilane bridged diphosphanes are known, for example HypP(H)–Si 2 Me 4 –P(H)Hyp and several cyclic or metalated compounds . The P–C NHC bond in 3 [175.1(2) pm] is nearly as long as in 1 and 2 , the P–Si bond length of 224.2(1) pm is in between the ones observed for 1 and 2 and almost identical to the P–Si distance in the sterically stressed compound HypP(H)–Si 2 Me 4 –P(H)Hyp (224.0(5) pm) .…”

[Bis(diphenylphosphanyl)dimethylsilane-κ2P,P′]tetracarbonylchromium(0)

“…SiMe 2 SiMe 2 bridge (Sheldrick & Borkenstein, 1977). In the present publication, we report on the formation and molecular structure of the title compound, which was observed to be the single product of a complex formation of Ph 2 PSiMe 2 PPh 2 with Cr(CO) 6 .…”

“…For the synthesis of Ph 2 PSiMe 2 PPh 2 , see: Hassler & Seidl (1988). The molecular and crystal structures of the tetracarbonyl tungsten complex of [( i Pr 2 N) 2 BP(H)] 2 SiMe 2 and the tetracarbonyl molybdenum complex of (PhPHSiMe 2 ) 2 were presented by Chen et al (1999) and Sheldrick & Borkenstein (1977) Data collection: X-AREA (Stoe & Cie, 2005); cell refinement: X-AREA; data reduction: X-AREA; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: XP in SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXL97.…”

Reactions and Coordination Properties of the First Secondary Carbaboranyldiphosphane: 1,2-Bis(phenylphosphanyl)-1,2-dicarba-closo-dodecaborane(12)

“…Similar coupling patterns were observed in the 1 H-NMR spectra of 7, 9 and 10. The P-P coupling of the PϪCϪCϪP fragment was observed only in the 1 H-NMR [22] spectra of 7 and 9. For 10, the coupling constant of the PϪMoϪP fragment ( 2 J PP ϭ 19 Hz) was observed in the 1 H-NMR spectrum [27] .…”

“…A comparison of 10 with cis-tetracarbonyl{1,4-η 2 -[1,2-dimethyl-1,2-bis(phenylphosphanyl)disilane]}molybdenum(0) (cis-rac-11)[22] , the only other structurally characterized complex of an Mo(CO)4 fragment with a coordinated secondary diphosphane ligand (Figure 2), shows that the MoϪP bond lengths [2.4445(6), 2.4559(6) Å (10); 2.550(1) Å (11)] and PϪMoϪP bond angle [84.31(2) (10); 89.4(1)°(11)] of 10 are smaller. For the MoϪCO groups trans to the coordinated P atoms, the MoϪC distances are larger [2.015(3), 2.017(3)Å (10); 1.994(4) Å (11)] and the CϪO bond lengths shorter [1.139(3), 1.140(3)Å (10); 1.152(5) Å (11)] in 10.…”