Dicarbonyl(η⁵‐cyclopentadienyl)(di‐tert‐butyl‐λ⁴‐arsanediyl)molybdenum and ‐tungsten— The First Complexes with a Metal‐Arsenic Double Bond

Abstract

4] Rhombic (from pentane), space group PhcZl (C?"), 2 = 8 ; a=1652.4(4), b= 1654.3(3), c= 1559.9(5) pm; AED; 3 " 6 2 6 6 0 " ; 2264 independent reflections with I > 3.00(0; R,,,=0.045, Ran,,,= 0.042. Further details of the crystal structure investigation can be obtained on request from the Fachinformationszentrum Energie Physik Mathematik, D-7514 Eggenstein-Leopoldshafen by quoting the number CSD 50344, the names of the authors, and full citation of the journal.

Synthesis and reactivity of mononuclear molybdenum phosphido complexes, [Mo(CO)2{P(Cl)R}(η-C5H5)][R = CH(SiMe3)2or NCMe2CH2CH2CH2CMe2]. X-Ray crystal structures of [Mo(CO)2{P(X)(NCMe2CH2CH2CH2CMe2)}(η-C5H5)](X = Cl or NMe2) and [Mo2(CO)4{µ-P2[CH(SiMe3)2

“…CH(SiMe,), in (8) and Ph in (9). All aspects of the molecular geometry of (9) are similar to those found in(8)…”

Hydrogen Bonding and Proton Transfer to the Trihydride Complex [Cp*MoH3(dppe)]: IR, NMR, and Theoretical Investigations

“…These values are identical to those established from the lowtemperature UV/Vis data within experimental error. [28] [Cp*Mo(PMe 3 )(PHPh 2 )(PPh 2 )], [29] [Cp*Mo(dppe)Cl], [30] and [CpMo(PMe 3 ) 2 (OH)]. [30,31] [29] It is also possible, however, that one additional TFE molecule adds to the system to afford an 18-electron adduct, which could even be further stabilized by intramolecular hydrogen bonding (see Scheme 4).…”

Molybdenum Open-Shell Organometallics. Spin State Changes and Pairing Energy Effects

“…43 However, CpMoX(CO) 2 compounds where X is a good π-donating and sterically encumbering phosphido or arsenido ligand have been isolated and structurally characterized. 44,45 Another similar example is Cp*Mo(PR 2 )-(PMe 3 ) 2 . 46 The stability of these diamagnetic compounds can be related to the formal electronic saturation through participation of the X ligand lone pair.…”