Monohydride complexes of W (IV) containing bulky selenolate ligands: X-ray crystal structure determination of [WH(SeC6H3Pri2-2,6)3(PMe2Ph)2]

Single-crystalline WSe2 nanoflakes as efficient electrocatalysts

“…2). The Se–W bond length, ranging from 2.4–2.5 Å, differs from analogous sulfur compound [W{(SC 2 H 4 ) 2 NMe} 2 ] (2.2–2.4 Å) 29,35–37 however they are in accordance with other reported W–Se bond lengths. 31 The W–N bond lengths (2.388(5) and 2.391(6) Å) are within the range of literature-reported values (1.92–2.49 Å) 38,39 and less elongated, when compared to the sulfur containing structure (2.375(6) and 2.377(6) Å) (Table 1).…”

Mononuclear Sulfido-Tungsten(V) Complexes: Completing the Tp*MEXY (M = Mo, W; E = O, S) Series

“…These distances are essentially identical to the W–Se bonds in Tp*WO­(bds), where bds is benzene-1,2-diselenolate . The W–Se–C angles of 111.6(3)° and 105.9(3)° are ∼30° smaller than for the phenolate ligand, and similar to other W-selenolate species . The terminal sulfido is canted 103° away from the WSe 2 plane, smaller than for Tp*WS­(OPh) 2 .…”

Reactivity Studies of (tBu3SiNH)(tBu3SiN═)2WH Including Anionic Derivatives Featuring the Tris-tri-tert-butylsilylimide Tungsten Core

“…As Figure a illustrates, 2 -H-K­(OEt 2 ) 3 is a pseudotetrahedral molecule with the potassium bound to the hydride at 2.71(7) Å and to three ether molecules with d (K–O) av = 2.744(14) Å that are staggered with respect to the tungsten core . The W–H–K bridge angle is 153(2)°, and the tungsten–hydride distance is 1.72(6) Å, slightly longer than the sum of covalent radii (1.62 Å) and about the mean of a rather wide spectrum of d (WH) determined from X-ray studies. ,,− The tungsten–imido bonds average 1.806(4) Å, and the N–W–N angles are somewhat splayed from a tetrahedral value at 116.1(2)°, presumably reflecting the demonstrably greater steric influences among the imides versus the hydride. The N–W–H angles are correspondingly smaller, averaging 101.6(11)°, and the W–N–Si linkages are 166.9(23)°.…”

“…The molecular structure of [( t Bu 3 SiN) 3 WH]­[K­(crypt-2.2.2)] ( 2 -H-Kc) was also determined by X-ray crystallography, and two discrete ionsthe [( t Bu 3 SiN) 3 WH] − anion and the [K­(crypt-2.2.2)] + cationare clearly separated in the structure. Unfortunately, while the hydride pertaining to the anion was determined by a difference Fourier map and successfully refined, its d (WH) of 1.93(9) Å and H–W–N angles (118(2)°, 92(2)°, 90(2)°) likely reflect an inaccuracy in the model. ,,− Refinement and data collection parameters are given in Table and the metrics of the molecule are listed in Table . The core of the [( t Bu 3 SiN) 3 WH] − anion that is illustrated in Figure b is very similar to the previous cases, with d (WN) av = 1.804(4) Å, N–W–N angles that average 116.8(6)°, and W–N–Si linkages that are nearly linear (175.4(4)° av ).…”