Synthesis and crystal structure analysis of bis(.eta.5-cyclopentadienyl)-.mu.-[trifluoromethyl(oxodiphenylphosphino)acetylene]-dinickel(0)

Highly Metallized Polymers: Synthesis, Characterization, and Lithographic Patterning of Polyferrocenylsilanes with Pendant Cobalt, Molybdenum, and Nickel Cluster Substituents

“…The Ni−Ni bond in 5 was orthogonal to the acetylenic bond, as observed in the analogous complex [Cp 2 Ni 2 (PhC 2 Ph)] . The Ni−Ni bond length in 5 is 2.3379(6) Å and is typical for nickel−alkyne complexes. , Upon coordination, the acetylenic bond lengthened significantly from 1.197(4) 21 to 1.342(6) Å, which is slightly longer than that of free ethylene ( d (CC) = 1.34 Å) . Angles around the acetylenic carbons range from 143 to 154°, indicating a bending back of the phenyl group upon clusterization of the alkyne.…”

Alkynyldiphenylphosphine d8(Pt, Rh, Ir) Complexes: Contrasting Behavior towardcis-[Pt(C6F5)2(THF)2]

“…The insolubility of this complex ( 10 ) precludes its characterization by NMR spectroscopy in solution. However, its IR spectrum reveals the presence of only one ν(C⋮C) signal (1981 cm -1 ) and the appearance of a new band in the PO stretching region (1165 cm -1 ) at lower frequencies than those observed in PPh 2 (O)C⋮CPh [ν(C⋮C) 2173, 2156 cm -1 ; ν(PO) 1194 cm -1 ], in accordance with the presence of an acetylenic phosphine oxide coordinated through the oxygen atom and the acetylenic fragment. ,, …”

(p-cymene)Ruthenium(II)(diphenylphosphino)alkyne Complexes: Preparation of (μ-Cl)(μ-PPh2C⋮CR)-Bridged Ru/Pt Heterobimetallic Complexes

“…Recently, Nelson and co-workers have reported (arene)Ru(II) derivatives with vinyl and allyl phosphines and 3,4-dimethyl-1-phenylphosphole, showing interesting reactivity with some of them. , Thus, they found that complexes (η 6 -arene)RuCl 2 (DPVP)] (DPVP = diphenylvinylphosphine) undergo a novel KO t Bu-promoted hydroalkylation to produce tethered phosphinopropylarene-ruthenium(II) compounds . As far as we are aware, no analogous derivatives have been reported with phosphinoalkynes, although these ligands (PPh 2 C⋮CR) have revealed an interesting reactivity in transition metal chemistry, such as P−C bond cleavages, − insertion, − and coupling reactions. , In addition, simple P-complexation of these (Ph 2 PC α ⋮C β −R) ligands usually induces a polarization , in the alkyne function, with the C α being partially negatively charged, making them susceptible to electrophilic and nucleophilic reactions with simple molecules such as water, , ethanol, , XH, PPh 2 H, or amines. , …”

“…2002 although these ligands (PPh 2 CtCR) have revealed an interesting reactivity in transition metal chemistry, such as P-C bond cleavages, 20-26 insertion, [27][28][29][30][31][32] and coupling reactions. 33,34 In addition, simple P-complexation of these (Ph 2 PC R tC β -R) ligands usually induces a polarization 35,36 in the alkyne function, with the C R being partially negatively charged, making them susceptible to electrophilic and nucleophilic reactions with simple molecules such as water, 37,38 ethanol, 39,40 XH, 41 PPh 2 H, 42 or amines. 29,32 In previous papers, when studying the reactivity of [cis-MX 2 (PPh 2 CtCR) 2 ] (M ) Pd, Pt; X ) Cl, 43 C 6 F 5 , 44,45 or CtCR′; 46 R ) Ph, Tol, t Bu; R′ ) Ph, t Bu) toward the "cis-Pt(C 6 F 5 ) 2 " synthon, we have shown an unprecedented and easy chemo-, regio-, and stereoselective insertion of both PPh 2 CtCR ligands (R ) Ph, Tol) into the robust Pt-C 6 F 5 bond 44,45 and also the very low η 2bonding capability of the bulkier PPh 2 CtC t Bu ligand.…”