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Showing papers by "Louis J. Farrugia published in 1987"


Journal ArticleDOI
TL;DR: In this article, the structure of (5) has been established by X-ray diffraction, where the Fe-W bond is bridged by the C(C6H4Me-4)C(O)O fragment.
Abstract: The compound [W(CC6H4Me-4)(CO)2(η-C5Me5)](1) reacts with [Fe(CO)3(η-C8H14)2] in hexane at ca.–50 °C to give predominantly the electronically unsaturated dimetal complex [FeW(µ-CC6H4Me-4)(CO)5(η-C5Me5)](2). With [Fe2(CO)9] in Et2O at ca. 10 °C, compound (1) yields a chromatographically separable mixture of (2), the saturated dimetal species [FeW(µ-CC6H4Me-4)(CO)6(η-C5Me5)], and the trimetal compound [Fe2W(µ3-CC6H4Me-4)(µ-CO)(CO)8(η-C5Me5)]. The latter is best obtained by treating (1) with excess of [Fe2(CO)9] in Et2O at ambient temperatures. Complex (2) reacts with oxygen and with sulphur to afford [FeW{µ-C(C6H4Me-4)C(O)O}(CO)5(η-C5Me5)](5) and [FeW(µ-SCC6H4Me-4)(CO)5(η-C5Me5)], respectively. The structure of (5) has been established by X-ray diffraction. The Fe–W bond [2.605(1)A] is bridged by the C(C6H4Me-4)C(O)O fragment [Fe–O 2.007(3), W–O 2.128(3), Fe–C(C6H4Me-4) 2.054(4), and W–C(C6H4Me-4) 2.171(4)A], with the CO group interacting weakly if at all with the iron or tungsten centres [Fe ⋯ C(O) 2.380(3) and W ⋯ C(O) 2.609(3)A]. The iron atom carries three CO groups, and the tungsten two CO groups and the η-C5Me5 ligand. Treatment of (2) with an excess of CH2N2 gives [FeW{µ-C(C6H4Me-4)=CH2}(µ-CH2)(CO)5(η-C5Me5)]. However, with one equivalent of CH2N2, the major product is [FeW{µ-trans-CHC(H)C6H4Me-4}(µ-CO)(CO)5(η-C5Me5)], together with spectroscopically identified [FeW{µ-trans-CHC(H)C6H4Me-4}(µ-CH2)(CO)5(η-C5Me5)]. Compound (1) reacts with [Co2(CO)8] to give [Co2W(µ3-CC6H4Me-4)(CO)8(η-C5Me5)], and with [Ni2(µ-CO)2(η-C5H5)2] to give a mixture of [Ni2W(µ3-CC6H4Me-4)(CO)2(η-C5H5)2(η-C5Me5)] and [NiW2(µ-CC6H4Me-4)2(CO)4(η-C5Me5)2].

37 citations


Journal ArticleDOI
TL;DR: In this article, different metal connectivities are found for [Hg{Fe2M(µ3-COMe)(CO)7(η-C5H5)]2] in the solid state, whilst in solution 13C and 199Hg n.m.r.
Abstract: Differing metal connectivities are found for [Hg{Fe2M(µ3-COMe)(CO)7(η-C5H5)}2](M = Co and Rh) in the solid state, whilst in solution 13C and 199Hg n.m.r. data suggest a novel polytopal rearrangement in the Rh compound with the Hg atom migrating around the Fe2Rh triangles.

20 citations


Journal ArticleDOI
TL;DR: Co 3 (μ-COCH 3 )(CO) 9 cristallise dans le systeme triclinique, groupe d'espace P1 et sa structure est affinee jusqu'a R=0,026.

16 citations


Journal ArticleDOI
TL;DR: The title complex of as mentioned in this paper was prepared by reacting lead(II) nitrate with a stoichiometric amount of 1-methylimidazoline-2(3H)-thione (mimt) in water.

14 citations


Journal ArticleDOI
TL;DR: The spiked triangular triosmium-platinum cluster complex Os 3 Pt(μ-H),μ 4 -η 2 -CCPh)(CO) 10 (PCy 3 ) has been synthesized by treatment of the unsaturated Os 3 P(μH) 2 (CO) ) with LiC Ω(CPh) followed by protonation as discussed by the authors.

7 citations


Journal ArticleDOI
TL;DR: The zero-valent ruthenium compounds [RuW2(µ3-C2R2)(CO)7(η-C5H5)2] and as discussed by the authors ] were derived from a single-crystal X-ray diffraction study.
Abstract: The zero-valent ruthenium compounds [Ru(η6-C8H10)(cod)](C8H10= cycle-octa-1,3,5-triene, cod = cyclo-octa-1,5-diene) or [Ru(η6-C10H8)(cod)](C10H8= naphthalene) react at room temperature in light petroleum with the alkylidynetungsten complexes [W(CR)(CO)2(η-C5H5)](R = C6H4Me-4 or Ph) to give a chromatographically separable mixture of the cluster compounds [RuW2(µ3-C2R2)(CO)7(η-C5H5)2] and [RuW3(µ-CO)(µ3-η-CO)(µ-CR)2(µ3-CR)(CO)2(η-C5H5)3]. A single-crystal X-ray diffraction study established the molecular structure of the rutheniumtritungsten species containing phenylmethylidyne ligands. The metal-atom core consists of a RuW2 triangle [W–Ru 2.775(2) and 2.847(2), W–W 2.610(l)A] to which a third tungsten atom is attached via the ruthenium [W–Ru 2.735(2)A]. The ‘exo- ligated’ tungsten atom carries a terminal CO ligand and a C5H5 group, with the Ru–W bond asymmetrically bridged by CPh and CO groups. The latter is also η-co-ordinated to one of the tungsten atoms in the RuW2 triangle [W–C 2.43(1), W–O 2.05( 1)A] so that it occupies a triply-bridging site. The tungsten atoms in the triangle are ligated by C5H5 groups, and the ruthenium atom carries a terminal CO ligand. A phenylmethylidyne group symmetrically caps the triangle, and a similar fragment edge-bridges the W–W bond. A carbonyl group bridges the Ru–W edge of the triangle. The compounds [RuW3(µ-CO)(µ3-η-CO)(µ-CR)2(µ3-CR)(CO)2(η-C5H5)3] react with tertiary phosphines to afford complexes [RuW3(µ-CO)(µ3-η-CO){µ-C(R)C(O)}(µ-CR)(µ3-CR)(CO)(PR′3)(η-C5H5)3](R = C6H4Me-4,PR′3= PMe3; R = Ph, PR′3= PMe3 or PMePh2) containing ketenyl groups. An X-ray diffraction study on the complex with R = Ph and PR′3= PMe2Ph established the structure of this class of compound. The core structure of the molecule is remarkably similar to that of its precursor, with the RuW2 triangle ‘spiked’ by a tungsten atom, and with bridging µ-CR, µ3-CR, µ-CO, and µ3-η-CO groups. The important difference is associated with the exo-ligated tungsten which now carries a PMePh2 ligand instead of a terminal CO group, and the W–Ru vector is edge-bridged by a µ-C(Ph)C(O) fragment [W–Ru 2.771 (1), µ-C–Ru 2.19(1), µ-C–W 2.15(1), µ-C(O)–W 2.14(1), µ-C–C 1.39(2)A]. The i.r. and n.m.r. (1H and 13C-{1H}) spectra of the new compounds are discussed in relation to their structures.

5 citations


Journal ArticleDOI
TL;DR: The tri(alkyne)monocarbonyltungsten complex [W(CO)(C2Et2)3] reacts with [Co2(CO)8] to form [Co 2W(µ-C 2Et 2)(µ -C4Et4)(CO) 8], the structure of which has been established by X-ray diffraction as mentioned in this paper.
Abstract: The tri(alkyne)monocarbonyltungsten complex [W(CO)(C2Et2)3] reacts with [Co2(CO)8] to form [Co2W(µ-C2Et2)(µ-C4Et4)(CO)8], the structure of which has been established by X-ray diffraction

3 citations