1,721,260 research outputs found
Parallel and inclined (1D -> 2D) interlacing modes in new polyrotaxane frameworks [M-2(bix)(3)(SO4)(2)] [M = Zn(II), Cd(II); Bix=1,4-bis(imidazol-1-ylmethyl)benzene]
No full textThe reactions of M-II sulfates (M = Zn, Cd) with the flexible ligand 1,4-bis(imidazol-1-ylmethyl)benzene (bix) yield the novel interesting coordination networks [M-2(bix)(3)(SO4)(2)], containing 1D polymeric motifs of alternating rings and rods, which show extended rotaxane-like mechanical links producing 2D sheets via unprecedented parallel (M = Zn) or inclined (M = Cd) interlacing modes of the chains
The crystal and molecular structure of trans-chlorocarbonylbis(triphenylphosphine)rhodium(I) in its monoclinic form
No full textThe structure of the title compound, RhCl(CO)(PPh3)2, has been investigated in its monoclinic modification. It belongs to space group P21/n (No. 14), with cell constants a 12.182(3), b 24.285(5), c 11.894(3) Å, β 113.10(2)°, Z = 4. The structure was solved by conventional Patterson and Fourier methods, on the basis of 4295 significant counter data, by least-squares methods to a final conventional R values of 0.051. The complex exhibits a square planar coordination, with the two bulky phosphine ligands in mutually trans positions. The mean value of the RhP bond lengths is 2.326 Å. The RhCl, RhC and CO bond lengths are 2.371(2), 1.810(7), and 1.144(8) Å, respectively. The structure is compared with those of similar species and the small differences observed between the monoclinic and triclinic modifications of this compound are discussed. © 1973
High nuclearity carbonyl clusters of rhodium. Part 2. Crystal and molecular structure of the tetramethylammonium salt of dodeca-μ-carbonyl-dodecacarbonylhydrido-polyhedro-tridecarhodate(4-)-1- methylpyrrolidin-2-one (1/3)
No full textThe title compound, [N(CH3)4]4[Rh13H(CO) 24]·3C5H9NO, crystallises in the triclinic space group P1 with unit-cell dimensions a = 22.596(11), b = 14.263(7), c = 14.512(8) Å, α = 65.56(3), β = 107.58(4), γ = 100.86(5)°, and Z = 2. The structure has been solved by conventional Patterson and Fourier methods from single-crystal X-ray counter data and refined by least-squares methods to R 0.061 for 3 680 significant reflections. The anion, of idealised Cs symmetry, containing a centred twinned-cuboctahedron of metal atoms, is similar to that of the other members of the family [Rh13H5-n(CO)24]n- already studied. The mean value of the Rh-Rh bond lengths, ranging from 2.718(3) to 2.894(3) Å, is 2.782 Å. The Rh-C and C-O interactions for the 12 terminal and for the 12 edge-bridging CO groups have mean values of 1.80, 1.18, and 1.97, 1.21 Å, respectively. The hydride atom has been located in a semi-octahedral cavity, i.e. on a square face of the cluster, bisected by the ideal mirror plane
Synthesis and X-ray structural characterization of the [Rh22(μ3-CO)7(μ-CO)18(CO) 12]4- anion containing a large close-packed cluster with an ABAC sequence of compact layers [1]
No full textA mixed-metal nitrido carbonyl cluster compound. Synthesis and X-ray structure of the [PtRh10N(μ-CO)10(CO)11]3- anion
No full textCrystal and molecular structure of bis(tetraethylammonium) 1,2;2,3;3,1-tri-μ-hydrido-μ 3,-oxo-1,1,1,2,2,2,3,3,3-enneacarbonyl-triangulo-trirhenate(2-)
No full textThe title compound, [NEt4]2[Re3H3O(CO)9], crystallizes in the orthorhombic space group Pnma with cell constants a = 15.05(2), b = 12.32(1), c = 18.35(2) Å, Z = 4. The structure has been determined by vector methods from single-crystal X-ray counter data and refined by block-diagonal least squares to a conventional R value of 0.032 for 1 147 independent reflections. The anion contains an equilateral triangle of metal atoms (mean Re-Re 2.968 Å) capped by a symmetric triply bridging oxo-ligand (mean Re-O 2.12 Å). The carbonyl groups are all terminally bonded, three for each rhenium atom (mean Re-C and C-O 1.88 and 1.18 Å). The overall idealized anion symmetry is C3v. The carbonyl disposttion implies that the three hydrido-ligands lie in bridging positions on the Re3 triangular edges
A large rhodium carbonyl cluster compound containing four encapsulated nitrogen atoms: Synthesis and X-ray structure of the anion [Rh 23N4(CO)20(μ-CO)18]3
No full textThe novel anion [Rh23N4(CO)20(μ-CO) 18]3-, obtained by controlled pyrolysis of [Rh 6N(CO)15]-, contains a large metallic polyhedron of idealized C2 symmetry, which has 21 surface metals and encloses a couple of bonded rhodium atoms and four interstitial nitrogen atoms, each connected to five rhodium atoms
Synthesis and x-ray crystal structure of the cluster compound [Rh12H2(μ3-CO)3(μ-CO) 9(CO)13] containing a metallic array formed by three superimposed cofacial octahedral units
No full textThe neutral species [Rh12H2(CO)25], obtained by reaction of [Rh14(CO)25]4- with CF3CO2H in the presence of CO and chloride ions, contains a new Rh12 metallic array formed by superimposition of three face-sharing octahedral units, and in donor solvents readily gives the [Rh12H(CO)25]- monoanion
Synthesis and x-ray crystal structure of the cluster dianion, [Rh 10(CO)21]2-, containing a new compact array of metal atoms
No full textThe anion [Rh10(CO)21]2-, obtained by reaction of [Rh9(CO)19]3- with the [Rh(CO) 2(NCMe)2]+ cation, contains a novel decanuclear metallic skeleton which is a fragment of hexagonal close-packed lattice formed by three superimposed layers (3/4/3 metals), with two octahedral and two tetrahedral condensed units as confirmed by X-ray crystallography
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