Showing papers by "Louis J. Farrugia published in 1995"
TL;DR: In this paper, the synthesis of a range of bismuth(III) arenethiolates and a thiolato anion are described together with two X-ray crystal structure determinations of SC6F5 derivatives.
48 citations
TL;DR: In this paper, the reaction between BiI3 and two equivalents of dmpu (dmpu = N, N'-dimethylpropylene urea) in thf (tetrahydrofuran) or toluene affords dark red crystals of the complex [Bi(Dmpu)(6)][Bi3I12] which was characterised by X-ray crystallography.
Abstract: The reaction between BiI3 and two equivalents of dmpu (dmpu = N,N'-dimethylpropylene urea) in thf (tetrahydrofuran) or toluene affords dark red crystals of the complex [Bi(dmpu)(6)][Bi3I12] which was characterised by X-ray crystallography and consists of octahedral [Bi(dmpu)(6)](3+) cations and [Bi3I12](3-) anions both with ($) over bar 3 symmetry. An analogous reaction between SbI3 and dmpu afforded orange crystals of what is probably a hydrolysis product, [C5NH6](2)[H(dmpU)(2)] [Sb2I9], which was also characterised by X-ray crystallography and contains a face-shared biocathedral [Sb2I9](3-) anion with two pyridinium cations and a hydrogen bonded [H(dmpu)(2)](+) cation. [CH2 = C(C6H4-4-NO2)CH(2)NMe(3)]I and one equivalent of SbI3 afforded the orange crystalline complex [CH2=C(C6H4-4-NO2)CH(2)NMe(3)](3)[Sb2I9] an X-ray crystallographic study of which revealed a face-shared bioctahedral [Sb2I9](3-) anion similar to that present in [C5NH6](2)[H(dmpu)(2)][Sb2I9]. Four equivalents of BiI3 and [CH2 = C(C6H4-4-NO2)CH(2)NMe(3)]I afforded the complex [CH2 = C(C6H4-4-NO2)CH(2)NMe(3)](3)[Bi3I12], the [Bi3I12](3-) anion being essentially identical to that encountered in [Bi(dmpu)(6)][Bi3I12]. [CH3(CH2)(2)COS(CH2)(2)NMe(3)]I and four equivalents of SbI3 yielded orange crystals of the complex [CH3(CH2)(2)COS(CH2)(2)NMe(3)](4)[Sb8I28] which was also characterised by X-ray crystallography and shown to contain a new structural type of [E(8)X(28)](4-) anion (E = As, Sb, Bi; X = halide).
44 citations
01 Jan 1995
TL;DR: In this paper, an atomic view of diffusion on metal surfaces is presented, along with an overview of the MO Architectures of metal Clusters using Graphic Tools.Can We Put the Cluster-Surface Analogy on a Sound Structural Basis? A.M. Bradshaw.
Abstract: Can We Put the Cluster-Surface Analogy on a Sound Structural Basis? A.M. Bradshaw. An Atomic View of Diffusion on Metal Surfaces G.L. Kellog. Dynamics of the Desorption of Carbon Monoxide from Size-Selected Supported Platinum Clusters U. Heiz, R. Sherwood, D.M. Cox, A. Kaldor, J.T. Yates Jr. NMR Investigation of Binding of Aromatics at Catalytic Surfaces C. Dybowski, M.A. Hepp. From Molecular Carbonyl Clusters to Supported Metal Particles R. Giordano, E. Sappa, G. Predieri. Cluster Equilibria. Relevance to the Energetics and Reactivity of Surface Bound Fragments T.P. Fehlner. Reactions and Dynamics of Ruthenium Clusters K. Vrieze, C.J. Elsevier. Unusual Ligand Transformations and Rearrangements in Heterometallic Clusters Y. Chi, S.-J. Chang, C.-J. Su. Hydride Mobility and its Relation to Structure and Reactivity in Polymetallic Clusters E. Rosenberg. Structural Variations in Tetranuclear Platinum-Ruthenium Clusters L.J. Farrugia, D. Ellis, A.M. Senior. Intramolecular Exchange in d 9 Metal Carbonyl Clusters R. Roulet. Static and Dynamic Stereochemistry of the Organometallic Cluster Complexes [CpCo)3(mm3-Arene)] H. Wadepohl. NMR Studies on the Dynamic Behaviour in Solution of Rhenium-Platinum Mixed Metal Clusters Containing P-Donor Ligands T. Beringhelli, G.D. Alfonso, A.P. Minoja, R. Mynott. Organometallic Migrations over Clusters and Surfaces M. J. McGlinchey, L. Girard, A. Decken. Structure, Melting and Reactivity of Nickel Clusters from Numerical Simulations J. Jellinek, Z.B. Guvenc. Heterodox Bonding Effects between Transition Metal Atoms S. Alvarez, P. Alemany, G. Aullon, A.A. Palacios, J.J. Novoa. Periodic Hartree-Fock Calculations of the Adsorption of Small Molecules on TiO2 C. Minot, A. Fahmi, J. Ahdjoudj. An Overview of the MO Architectures of Metal Clusters Using Graphic Tools C. Mealli. Molecular Orbital Approach of Skeletal Isomerism and Polyhedral Rearrangements in some Organometallic Clusters J.-Y. Saillard, M.T. Garland, S. Kahlal, J.-F. Halet. Some Old and New Redox Reactions of Polynuclear Organometallic Complexes H. Vahrenkamp. Arene Cluster Compounds B.F.G. Johnson. Silver and Gold Clusters Stabilized by Fe(CO)4 Ligands F. Calderoni, M.C. Iapalucci, G. Longoni, U. Testoni. Reactions of Silylalkanes with Triosmium and Triruthenium Clusters A.A. Koridze.
43 citations
TL;DR: In this article, the reaction between [CH2=C(C6H4-4-NO2)CH2NMe3]I and eight equivalents of BiI3 in thf (tetrahydrofuran) afforded, after work-up, dark red crystals of the compound [CH 2=C 6H 4-4NO2]n[{Bi2I7}n], the structure of which was established by X-ray crystallography and shown to contain a polymeric iodobismuthate anion.
Abstract: The reaction between [CH2=C(C6H4-4-NO2)CH2NMe3]I and eight equivalents of BiI3 in thf (tetrahydrofuran) afforded, after work-up, dark red crystals of the compound [CH2=C(C6H4-4-NO2)CH2NMe3]n[{Bi2I7}n], the structure of which was established by X -ray crystallography and shown to contain a polymeric iodobismuthate anion. An analogous reaction between [CH3(CH2)2COS(CH2)2N(CH3)3]I and eight equivalents of BiI3 afforded orange crystals of the compound [CH3(CH2)2COS(CH2)2N(CH3)3]4[Bi4I16] which was shown by X -ray crystallography to contain the tetranuclear [Bi4I16]4- anion.
26 citations
TL;DR: A range of bismuth and antimony thiolates, Bi(SR)3(R = C6F5, C6H4, 2,6-Me2C6H3 or 3,5-Me 2C 6H3), have been synthesized and the structures of the two antimony complexes have been determined as discussed by the authors.
Abstract: A range of bismuth(III) and antimony(III) thiolates, Bi(SR)3(R = C6F5, 4-MeC6H4, 2,6-Me2C6H3 or 3,5-Me2C6H3) and Sb(SR)3(R = 4-MeC6H4 or 3,5-Me2C6H3) has been synthesised and the structures of the two antimony complexes have been determined. Both structures reveal a trigonal-pyramidal antimony centre bonded to three thiolate groups with, for the 4-MeC6H4 complex, additional intermolecular Sb ⋯ S interactions and, for the 3,5-Me2C6H3 complex, intermolecular arene to antimony interactions. The syntheses and structures of the organotransition-metal complexes [Bi(SC6F5){M(CO)3(η-C5H5)}2](M = Mo or W) are also reported in which the bismuth centre is bonded to one SC6F5 group and two M(CO)3(η-C5H5) fragments with no short intermolecular interactions.
26 citations
TL;DR: In this article, an X-ray crystallographic study revealed a six-coordinate complex with a geometry close to that of a regular octahedron with the three thiolates and three thiourea ligands both having fac configurations, and the reaction between 1 and either OPPh3, hmpa (hexamethylphosphoramide) or dmpu (N,N′-dimethylpropyleneurea) afforded the bis(ligand) complexes [Bi(SC6F5)3(OPPh3)2]·
Abstract: The reaction between Bi(SC6F5)31 and SPPh3 afforded crystals of [Bi(SC6F5)3(SPPh3)]5 which was characterised by X-ray crystallography. Complex 5 contains a bismuth centre bonded to three SC6F5 groups and the sulfur atom of a SPPh3 ligand such that the co-ordination geometry is disphenoidal with the SPPh3 ligand trans to one thiolate group. An additional intermolecular interaction is also present due to a weakly bridging thiolate sulfur which results in a centrosymmetric dimer with each bismuth centre having square-based pyramidal five-co-ordination. A similar structure was observed for the anion in the ionic complex [K(18-crown-6)][Bi(SC6F5)3(NCS)]6(18-crown-6 = 1,4,7,10,13,16-hexaoxacyclooctadecane) derived from the reaction between 1 and [K(18-crown-6)]SCN. The anion [Bi(SC6F5)3(NCS)]– has a disphenoidal geometry with an axial thiolate and N-bonded thiocyanate ligand which also bridges between two centrosymmetrically related bismuth centres giving a structure similar to 5. The reaction between 1 and either OPPh3, hmpa (hexamethylphosphoramide) or dmpu (N,N′-dimethylpropyleneurea) afforded the bis(ligand) complexes [Bi(SC6F5)3(OPPh3)2]·CH2Cl28, [Bi(SC6F5)3(hmpa)2]9 and [Bi(SC6F5)3(dmpu)2]10 respectively all of which were characterised by X-ray crystallography. The structures of 8–10 are all similar in being monomeric and having a five-co-ordinate, square-based pyramidal geometry around the bismuth centre with one thiolate in the apical site and the two ligands in a cis configuration in the basal plane each trans to a basal thiolate. The reaction between 1 and N,N′-dimethylthiourea, SC(NHMe)2′ afforded the tris(ligand) complex [Bi(SC6F5)3{SC(NHMe)2}3]11. An X-ray crystallographic study revealed a six-co-ordinate complex with a geometry close to that of a regular octahedron with the three thiolates and three thiourea ligands both having fac configurations. The structures are discussed in terms of the SC6F5 group having properties analogous to chloride, and hence being a pseudohalide, and also in terms of ligand co-ordination occuring through the thiolate Bi–S σ* orbitals.
22 citations
TL;DR: In this article, the reaction between TeCl 4 and two equivalents of OPPh 3 affords crystals of the coordination complex [TeCl 4 (OPPh 3 ) 2 ], which has been characterized by X-ray crystallography.
22 citations
15 citations
TL;DR: In this paper, the preparation, structure and spectroscopy of [Cr III (L · H 3 L)Cr III ][PF 6 ] 3 (H 3 L = N, N′, N″ -tris[(2 S )-2-hydroxypropyl]-1,4,7-triazacyclonononane) are presented.
11 citations
TL;DR: The reaction between In(NCS) 3 and two equivalents of Na[Mo(CO) 3 (η-C 5 H 5 )] afforded the indium thiocyanate complex as discussed by the authors.
10 citations
TL;DR: The synthesis of the compounds [K(18crown-6)][Bi{Co(CO)4}4] (1c) and [PPN][Bi[Co(Co)4]4](1d] (PPN = Ph3PNPPh3) is described in this article.
TL;DR: In this paper, the authors provided clear-cut crystallographic evidence of dynamic disorder arising from a reorientational jumping motion of the metal triangle, provided by variable-temperature diffraction experiments on the molecular and crystal structure of [Fe2Os(CO)12].
Abstract: Clear-cut crystallographic evidence of dynamic disorder arising from a reorientational jumping motion of the metal triangle is provided by variable-temperature diffraction experiments on the molecular and crystal structure of [Fe2Os(CO)12].
01 Jan 1995
TL;DR: In this article, the structural variability of tetranuclear Pt-Ru clusters is discussed, and some recent unpublished results relating to the structure variability are discussed, as well as the experimental results for the structure of the Pt atoms.
Abstract: While the well known electron counting rules [1,2] are of considerable utility in rationalising the metal core structures of many transition metal cluster compounds, there are problems with their use for those elements at the end of the transition series. This is of course well known for the Group 11 elements, especially gold [3], but this also holds true for Group 10 metals such as platinum [4,5]. The underlying causes for this behaviour are reasonably well understood from a molecular orbital viewpoint, and in the case of Pt-containing clusters, [5] it is possible to consider (at least as a crude approximation) the Pt atoms as being either 16 or 18 electron centres. One result of the electronic “ambivalence” of Pt is that there are often several structures of closely similar energy for cluster species with the same molecular formulae. In this paper we discuss some of our recent unpublished results relating to the structural variability of tetranuclear Pt-Ru clusters.