Carbonyl Cluster (carbonyl + cluster)

Distribution by Scientific Domains
Chemistry100%

Kinds of Carbonyl Cluster

  • metal carbonyl cluster
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  • transition metal carbonyl cluster
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    Selected Abstracts

    Reactivity of InCp* Towards Transition Metal Carbonyl Clusters: Synthesis and Structural Characterization of the Rh6(CO)16,x(InCp*)x Mixed-Metal Cluster Compounds, x = 1,2

    EUROPEAN JOURNAL OF INORGANIC CHEMISTRY, Issue 22 2007
    Elena V. Grachova
    Abstract With [Rh6(CO)15(InCp*)], the first example of a transition metal carbonyl cluster with a coordinated InCp* (Cp* = C5Me5) fragment in the ligand environment is reported. This cluster with direct Rh,In bonds forms in the reaction of the hexanuclear carbonyl rhodium cluster Rh6(CO)15(NCMe) with InCp* under mild conditions. This is characterized by means of IR and NMR spectroscopy and crystal structure analysis. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007) [source]

    Aromaticity of Tri- and Tetranuclear Metal,Carbonyl Clusters Based on Magnetic Criteria

    CHEMISTRY - A EUROPEAN JOURNAL, Issue 3 2007
    Clémence Corminboeuf Dr.
    Abstract Recently, the ,-aromaticity model proposed for cyclopropane by Dewar was employed to account for the stability of Group,8 trinuclear metal,carbonyl compounds [M3(CO)12] (M=Fe, Ru, Os). This paper further examines this hypothesis and provides the first quantitative evidence for the ,-aromatic/antiaromatic nature of the [M3(CO)12]/[M4(CO)16] species based on structural and nucleus-independent chemical-shift analysis. In addition, the extent of electron delocalization in tetrahedral [M4(CO)14] and butterfly [M4(CO)15] is analyzed and compared to prototype cycloalkanes. While remarkable analogies exist between metal,carbonyls and cycloalkanes, transition metals provide additional overlap possibilities that affect both the ring strain and the magnetic properties of metal,carbonyl rings and cages. [source]

    Reactivity of InCp* Towards Transition Metal Carbonyl Clusters: Synthesis and Structural Characterization of the Rh6(CO)16,x(InCp*)x Mixed-Metal Cluster Compounds, x = 1,2

    EUROPEAN JOURNAL OF INORGANIC CHEMISTRY, Issue 22 2007
    Elena V. Grachova
    Abstract With [Rh6(CO)15(InCp*)], the first example of a transition metal carbonyl cluster with a coordinated InCp* (Cp* = C5Me5) fragment in the ligand environment is reported. This cluster with direct Rh,In bonds forms in the reaction of the hexanuclear carbonyl rhodium cluster Rh6(CO)15(NCMe) with InCp* under mild conditions. This is characterized by means of IR and NMR spectroscopy and crystal structure analysis. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007) [source]

    On the use of breakdown graphs combined with energy-dependent mass spectrometry to provide a complete picture of fragmentation processes

    RAPID COMMUNICATIONS IN MASS SPECTROMETRY, Issue 16 2002
    Colin P. G. Butcher
    Both breakdown graphs and energy-dependent (ED) maps provide a means of visually representing the fragmentation processes resulting from collision-induced dissociation at different energies. The two presentation methods may be combined for a complete picture of the appearance, disappearance and maximum abundance collision potentials of each of the ions involved in the fragmentation process. A demonstration of this approach is presented using two very different classes of compound, an amino acid and a transition metal carbonyl cluster. Copyright © 2002 John Wiley & Sons, Ltd. [source]

    Synthesis, crystal structure and properties of a new lanthanide-transition metal carbonyl cluster

    APPLIED ORGANOMETALLIC CHEMISTRY, Issue 2 2009
    Jiehui Ye
    Abstract A new type heterobimetallic complex containing lanthanide and transition metal carbonyl cluster (LnM carbonyl cluster), Sm2{OOCCCo3(CO)9}2{OOCCF3}4{(CO)9Co3CCOOH}4, has been synthesized by reaction of (CO)9Co3CCOOH with Sm(OOCCF3)3(H2O)2, and structurally characterized by single-crystal X-ray diffraction. Application of the complex as a catalyst precursor for hydrogenation of carbon monoxide (Fischer,Tropsch reaction) was explored, and the thermogravimetric behavior and magnetic properties of the compound were examined as well. Copyright © 2008 John Wiley & Sons, Ltd. [source]

    187Os subspectra in 1H and 31P{1H} spectra of triosmium carbonyl clusters

    MAGNETIC RESONANCE IN CHEMISTRY, Issue 2 2002
    Marc J. Stchedroff
    Abstract A survey of the use of 187Os satellite subspectra in 1H and 31P{1H} spectra of triosmium carbonyl clusters is reported. By varying evolution delays in HMQC spectra of [Os3(µ-H)2(CO)10] we have selectively extracted the values for 1J(Os,H) and 2J(Os,H), respectively. An analysis of the principal modes of phosphine coordination in triosmium clusters demonstrates that 31P{1H}187Os satellite subspectra are diagnostic for equatorial coordination [1J(Os,P) = 211,223 Hz] or for axial coordination (perpendicular to the plane of the cluster) [1J(Os,P) , 147 Hz]. Chelating and bridging diphosphines yield 187Os satellite subspectra which are the sum of A2X and AA,X spin systems. If significant P,P coupling is present, the AA,X component requires simulation. All observed 2J(Os,P) trans -equatorial couplings fall in the range 38,65 Hz. Copyright © 2001 John Wiley & Sons, Ltd. [source]

    Synthesis and Characterisation of ,3 -Octahedral [Ni36Pd8(CO)48]6, and [Ni35Pt9(CO)48]6, Clusters Displaying Unexpected Surface Segregation of Pt Atoms and Molecular and/or Crystal Substitutional Ni/Pd and Ni/Pt Disorder

    CHEMISTRY - A EUROPEAN JOURNAL, Issue 9 2004
    Cristina Femoni Dr.
    Abstract The synthesis and structure, as well as the chemical and electrochemical characterisation of two new ,3 -octahedral bimetallic clusters with the general [Ni44,xMx(CO)48]6, (M = Pd, x = 8; M = Pt, x = 9) formula is reported. The [Ni35Pt9(CO)48]6, cluster was obtained in reasonable yields (56,% based on Pt) by reaction of [Ni6(CO)12]2, with 1.1 equivalents of PtII complexes, in ethyl acetate or THF as the solvent. The [Ni36Pd8(CO)48]6, cluster was obtained from the related reaction with PdII salts in THF, and was isolated only in low yields (5,10,% based on Pd), mainly because of insufficient differential solubility of its salts. The unit cell of the [NBu4]6[Ni35Pt9(CO)48] salt contains a substitutionally Ni,Pt disordered [Ni24(Ni14,xPtx)Pt6(CO)48]6, (x = 3) hexaanion. A combination of crystal and molecular disorder is necessary to explain the disordering observed for the Ni/Pt sites. The unit cell of the corresponding [Ni36Pd8(CO)48]6, salt contains two independent [Ni30(Ni8,xPdx)Pd6(CO)48]6, (x = 2) hexaanions. The two display similar substitutional Ni,Pd disorder, which probably arises only from crystal disorder. The structure of [Ni36Pd8(CO)48]6, establishes the first similarity between the chemistry of Ni-Pd and Ni-Pt carbonyl clusters. A comparison of the chemical and electrochemical properties of [Ni35Pt9(CO)48]6, with those of the related [Ni38Pt6(CO)48]6, cluster shows that surface colouring of the latter with Pt atoms decreases redox as well as protonation propensity of the cluster. In contrast, substitution of all internal Pt and two surface Ni with Pd atoms preserves the protonation behaviour and is only detrimental with respect to its redox aptitude. A qualitative rationalisation of the different surface-site selectivity of Pt and Pd, based on distinctive interplays of MM and MCO bond energies, is suggested. [source]