Mohamed F. Meidine

η1- and η2-coordination in phosphaalkeneplatinum(0) complexes. High resolution solid state 31P NMR spectrum of mesityl(diphenylmethylene)phosphinebis(triphenylphosphine)platinum(0)

Abstract The high resolution solid state 31 P NMR spectrum of Pt(PPh 3 ) 2 (P(mesityl)=CPh 2 ) shows the expected features for an η 1 -coordinated phosphaalkene ligand and is completely different from that of the η 2 -complex which exists in solution.

Phosphaalkynes as ligands in organometallic chemistry. Syntheses and 31p NMR spectra of platinum(II), palladium(II) and rhodium(I) complexes of dη5-cyclopentadienyltetracarbonyl-μ-(3,3-dimethyl-1-phosphabutyne)dimolybdenum, [Mo2(CO)4(η-c5H5)2tBuCP)]

Abstract Syntheses of the complexes trans -[PtCl 2 (PR 3 )Mo 2 (CO) 4 (η 5 -C 5 H 5 ) 2 ( t BuCP)], (PR 3 =PEt 3 , PPr 3 , PBu 3 , PPh 2 Me, PPhMe 2 ) trans -[PdCl 2 (PBu 3 )Mo 2 (CO) 4 (η 5 -C 5 H 5 ) 2 ( t BuCP)], and trans [RhCl{(PF 2 NMe) 2 CO}Mo 2 (CO) 4 (η 5 -C 5 H 5 ) 2 ( t BuCP)] are described and their 31 P NMR spectra presented and discussed.

Single crystal X-ray structure of benzene-solvated C60

The crystal structure of benzene-solvated C60 shows ordered molecules of C60 in an approximately hexagonal close-packed arrangement separated by benzene molecules.

The structural characterization of buckminsterfullerene compounds

Abstract The chemistry of buckminsterfullerene (C60) is in its infancy and an understanding of the principles for the preparation of pure C60 derivatives of known addition pattern and C60 materials of known composition is necessary for its development. Single crystal X-ray diffraction is a powerful tool for the determination of the structures of C60 compounds, five examples of which are described here. C60 is brominated by Br2 in a variety of solvents to give either C60Br6 or C60Br8, depending upon the particular solvent used. Crystals of C60Br6.Br2.CCl4 (1), C60Br6.2Br2 (2), and C60Br8.2Br2 (3) were obtained from CCl4, C6H6, and CS2 respectively. Slow evaporation of C6H6 solutions of C60 gives crystals of C60.4C6H6 (4). Mixing of saturated C6H6 solutions of C60 and ferrocene gives a dark red solution from which crystals of C60.2ferrocene (5) are deposited.

Tri- and tetra-metallic complexes containing phospha-alkyne ligands. First examples of μ3(η2-⊊) bonded phospha-alkynes; crystal and molecular structure of [Fe2Pt(Ph2PCH2CH2PPh2)(CO)6(Me3CCP)]

Abstract A new μ3(η2-⊊) coordination mode for a phospha-alkyne has been established in the complexes [Fe2pt(Ph2PCH2CH2PPh2)(CO)6(Me3CCP)] and [Fe3Pt{(Ph2PCH2)3CMe}(CO)10(Me3CCP)].

Synthesis of the first example of a metal complex containing a co-ordinated µ3-(η2-⊥) phospha-alkyne ligand. Addition of an Fe2(CO)6 unit to the η2-phospha-alkyne complex [Pt(dppe)(ButCP)]: crystal and molecular structure of [Fe2Pt(dppe)(CO)6(ButCP)](dppe = Ph2PCH2CH2PPh2)

A new mode of co-ordination for a phospha-alkyne ligand has been established in the complex [Fe2Pt(dppe)(CO)6(ButCP)].

Novel synthesis of a phosphinidene oxide-κP(RPO, R = ButCH2–) complex of rhenium(I) from a phosphaalkyne precursor. Crystal and molecular structure of [ReCl(Ph2PCH2CH2PPh2)2{P(O)CH2But}]

The first example of the transformation of a phosphaalkyne to a phosphinidene oxide-κP ligand is reported.

Insertion reactions of the [RhCl(PPh3)2] fragment into a phosphirene ring, and carbonylation of the resulting rhodium(III) complex. Crystal and molecular structures of [RhCl(PPhCPhCPh)(PPh3)2], [RhCl(PPhCPhCPhCO)(PPh3)2] and the novel dimeric complex [{RhCl(PPhCPhCPhCO)(PPh3)}2]

The first example of insertion of the d8 RhI fragment [RhCl(PPh3)2] into a phosphirene ring system results in a five-coordinate RhIII complex, which undergoes insertion of carbon monoxide to give either monomeric [[graphic omitted]O)(PPh3)2] or dimeric [{[graphic omitted]O)(PPH3)}2], the structures of which have been elucidated by NMR spectroscopy and single-crystal X-ray diffraction studies.

Insertion reactions of [Pt(PPh3)2] fragments into the four-membered ring complex [W(CO)5PPhC(OEt)CPhCHPh]. Crystal and molecular structures of [Pt(dppe)PPh(W(CO)5)C(OEt)CPhCHPh] and [Pt(PPh3)2((W(CO)5)PhPC(OEt)CPhCHPh)(η2-PC))]

Abstract Insertion of platinum bis(phosphane) fragments into a 1,2-dihydrophosphete ring lead to complexes derived from a 1-phosphabuta-1,3-diene species.

First examples of η1-ligated 1,2,4-triphosphacyclopentadienyl ring systems. Synthesis and fluxional behaviour of trans-[MCl(C2R2P3)(PEt3)2], (R=But, adamantyl), (M=Pd, Pt); crystal and molecular structures of trans-[PtX(C2But2P3)(PR3)2], (X=Cl, R=Et; X=I, R=Ph)

First examples of η1-ligated 1,2,4-triphosphacyclopentadienyl ring systems are described and structural features and solution fluxional behaviour are discussed.