Showing papers by "John F. Nixon published in 1993"
TL;DR: In this paper, a single crystal X-ray diffraction study of the chloro complex establishes mer-isomerism, which correlates very well with a rehybridization of tin from sp3 to d2sp3 upon complexation.
33 citations
29 citations
TL;DR: In this paper, the reaction of (E)- and (Z)-[W(CO)5( [graphic omitted]HPh)] complexes with [M(PR3)2(C2H4)][M = Pt, PR3= PPh3] has been studied and the following products have been fully characterised by NMR spectroscopy.
Abstract: The reaction of (E)- and (Z)-[W(CO)5( [graphic omitted]HPh)] complexes with [M(PR3)2(C2H4)][M = Pd, (PR3)2= dppe (Ph2PCH2CH2PPh2); M = Pt, PR3= PPh3] has been studied and the following products [which result from insertion of the M(PR3)2 frogment into the phosphirane ring] have been fully characterised by NMR spectroscopy: (2R*,3S*,4S*)-(±)-, (2R*,3S*,4R*)-(±)- and (2R*,3S*,4R*)-(±)-[(dppe) Pd(CHPhCHPhPPh)W(CO)5]; (2S*,3S*,4S*)-(±)-, (2S*3R*4R*)-(±)- and (2S*,3S*,4R*)-(±)-[(Ph3P)2Pt(CHPhCHPhPPh)W(CO)5]; and trans-(2S*,3S*,4R*)-(±)-[(Ph3P)(OC)Pt-(CHPhCHPhPPh)W(CO)5]. The crystal and molecular structures of (Z)-[W(CO)5([graphic omitted]HPh)], (2R*,3S*,4R*)-(±)- and (R*,3S*,4S*)-(±)-[(dppe)Pd(CHPhCHPhPPh)W(CO)5] have been determined. The configurations of the products are interpreted in terms of a transition state in which a P–C bond is η2-co-ordinated to M(PR3)2 fragment.
25 citations
TL;DR: In this paper, the structures of the di-and triphosphacyclopentadienyl ring systems of the type [Ru(η5-P2C3tBu3)(η 5-C8H11), [Ru[PPh3]PPh2C4H4], and [RhH( η1-P3C2tBu2)(δ5-C5Me5) (Pph3) have been determined by X-ray diffraction studies.
23 citations
TL;DR: In this article, 31 P and 195 Pt NMR studies on complexes of the type trans -MCl(P 3 C 2 t Bu 2 )(PR 3 ) 2 ], trans-P 3C 2 tBu 2 ) 2 (PR 3 ), (M Pd, Pt), and cis -Pt(P3C 2t Bu 2 ), including variable temperature measurements, have given information on the structures of the complexes, the mechanism of the "fluxional" process involving the P 3 C2 t Bu2 ring, and the signs
18 citations
TL;DR: In this article, the 3,3′-diphospha-1,1′-biphospholyl compound P4C5But6, obtained by oxidative coupling of two P2C3But3 anions, has been synthesised and its open structure is contrasted with the cage compounds P5C5but5 and P6C4But4(two isomers).
Abstract: The Novel 3,3′-diphospha-1,1′-biphospholyl compound P4C5But6, obtained by oxidative coupling of two P2C3But3 anions, has been synthesised and its open structure is contrasted with the cage compounds P5C5But5 and P6C4But4(two isomers).
18 citations
TL;DR: The alkyne and phospha-alkyne complexes [Fe 2 (CO) 5 (μ-dppm)(μ-η 2 CHC(CO)Ph)], this article ] were derived from the following:
16 citations
16 citations
TL;DR: The pentaphospha-phosphinidene triruthenium nonacarbonyl cluster [Ru3(CO)9(P5C5But5)], whose structure, elucidated by a single crystal X-ray crystallographic study, is related to that of the P5C 5But5 cage as mentioned in this paper.
Abstract: The pentaphospha-ferrocene [Fe(η5-P3C2But2)(η5-P2C3But3)], 1, reacts with [Ru3(CO)12], with extrusion of iron, to afford the novel phosphino-phosphinidene triruthenium nonacarbonyl cluster, [Ru3(CO)9(P5C5But5)], whose structure, elucidated by a single crystal X-ray crystallographic study, is related to that of the P5C5But5 cage.
12 citations
TL;DR: In this article, a variety of ligating modes are exhibited by RC[dbnd]P towards transition metal centers but, interestingly, the preferred bonding interaction is with the P[DBnd]C triple bond, rather than via the phosphorus lone-pair electrons, and it is shown that n 1-phospha-alkyne complexes of Mo(0) and Fe(II) can be synthesised in certain compounds, in which linear molecules can approach the metal center by virtue of the constraints imposed by the attendant diphosphane ligands.
Abstract: Novel reactions of phospha-alkynes are described. Phospha-alkynes, RC[dbnd]P, are proving to be important building blocks in inorganic and organometallic chemistry. A variety of ligating modes are exhibited by RC[dbnd]P towards transition metal centres but, interestingly, the preferred bonding interaction is with the P[dbnd]C triple bond, rather than via the phosphorus lone-pair electrons. Previously,1,2 we have shown that n1-phospha-alkyne complexes of Mo(0) and Fe(II) can be synthesised in certain compounds, in which linear molecules can approach the metal centre by virtue of the constraints imposed by the attendant diphosphane ligands.
12 citations
TL;DR: Hetero-bimetallic complexes of the type [Pt(dppe) ( t BuCP)M(CO) 5 ] (M Cr, Mo, W), containing an η 1, η 2 -ligated phospha-alkyne, are reported in this paper.
TL;DR: In this paper, a new type of ligating behavior of the phosphirene ring system was described, in which novel dimeric platinum(II) Chlorophosphane complexes result from the ring opening and a Pt-Cl bond insertion reaction.
Abstract: A new type of ligating behaviour of the phosphirene ring system [graphic omitted]Ph is described, in which novel dimeric platinum(II) Chlorophosphane complexes result from phosphirene ring opening and a Pt–Cl bond-insertion reaction.
TL;DR: In this paper, the first μ-parallel ligated phospha-alkyne was reported in the complex [Pt 2 Cl 2 (μ-dppm) 2 [μ-Bu t CP] whose structure has been elucidated by 31 p and 195 pt NMR studies.
TL;DR: The structure of the first nickel halogeniminophosphine complex is described in this article, and reactions of this and related compounds with AlCl3 afford the cationic complexes 7, 10, 11, 12, and 13 are obtained by treatment of the chloroiminphosphine complexes 1a and 4a with Grignard reagent.
Abstract: The structure of the first nickel halogeniminophosphine complex, i.e.(PEt3)2Ni(X–PNAr)2(Ar = 2,4,6-tri-tert-butylphenyl); X = Cl is reported; reactions of this and related compounds with AlCl3 afford the cationic complexes 7–10; the alkyliminophosphine complexes 12 and 13 are obtained by treatment of the chloroiminophosphine complexes 1a and 4a with Grignard reagent.
TL;DR: The transient phosphinidene complex [MePW(CO) 5 ] undergoes a cycloaddition to the Rh-Rh double bond in this paper.
TL;DR: In this paper, the synthesis and characterisation of Pt0, PtII, PdII, RhI, and W0 complexes containing the RP(NR′)PCR′(R Et3C, R′tBu) ring system are reported, and their NMR spectroscopic data are discussed.