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Richard D. Adams - One of the best experts on this subject based on the ideXlab platform.
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Open PentaRuthenium Cluster Complexes Formed from the Addition of Benzoic Acid to Ru_5(C)(CO)_15
Journal of Cluster Science, 2017Co-Authors: Richard D. Adams, Mitchell Smith, Jonathan TedderAbstract:Two isomers of Ru_5(C)(CO)_14(O_2CC_6H_5)(μ-H): Ru_5(C)(CO)_14(η^2-O_2CC_6H_5)(μ-H), 2 and Ru_5(C)(CO)_14(μ-O_2CC_6H_5)(μ-H), 3 were obtained from the reaction of Ru_5(C)(CO)_15 with benzoic acid (PhCO_2H). Both compounds were characterized structurally by X-ray diffraction analysis. Compound 2 contains an opened pentaRuthenium cluster with a chelating benzoate ligand on the Ruthenium Atom that was opened. Compound 3 contains an opened pentaRuthenium cluster with a benzoate ligand on that bridges a pair of Ruthenium Atoms which are not mutually bonded. Compound 2 can be converted partially to 3 and 3 partially back to 2 and they form a 1.54/1.0 ratio ( 3 / 2 ) at equilibrium in solution at 95 °C.
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Intramolecular Alkyne Coupling in the Reaction of 1,8-bis(phenylethynyl)naphthalene with Pt2Ru4(CO)18
Journal of Cluster Science, 2000Co-Authors: Richard D. AdamsAbstract:The reaction of Pt_2Ru_4(CO)_18, 1 with 1,8-bis(phenylethynyl)naphthalene, 2 has yielded two metal carbonyl cluster complexes: Ru_2(CO)_6[ μ - η ^2-C_10H_6C_4Ph_2], 3 (60% yield) and Ru_2Pt(CO)_6[ μ - η ^2-C_10H_6C_4Ph_2]_2, 4 (8% yield). Both compounds were characterized by a single crystal X-ray diffraction analysis. Both products were formed as a result of fragmentation of the Pt_2Ru_4 cluster of 1 . Compound 3 contains two Ruthenium Atoms. They are bridged by a tricyclic C_10H_6C_4Ph_2 ligand formed by the coupling of the two α -carbon Atoms of the alkyne groups. The β -carbon Atoms of the alkynes are σ -bonded to one of the Ruthenium Atoms to form a metallacycle and this entire group is π -bonded to the second Ruthenium Atom. Compound 4 contains two Ruthenium Atoms with a platinum Atom between them. This molecule contains two tricyclic C_10H_6C_4Ph_2 ligands similar to that in 3 , and two metallacycles formed by coordination of the β -carbon Atoms of both ligands to the platinum Atom. One ligand is π -bonded to each of the Ruthenium Atoms.
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Oxidative Addition of Silanes to Ru5(CO)15(μ5-C) under Photolytic Conditions. The Synthesis and Structural Characterizations of Ru5(CO)14(SiEt3)(μ5-C)(μ-H) and Ru5(CO)15(SiEt3)(μ5-C)(μ-H)
Organometallics, 2000Co-Authors: Richard D. Adams, Burjor CaptainAbstract:The reaction of Ru5(CO)15(μ5-C), 1, with triethylsilane in the presence of UV−vis irradiation has yielded two new cluster complexes: Ru5(CO)14(SiEt3)(μ5-C)(μ-H), 2, in 11% yield and Ru5(CO)15(SiEt3)(μ5-C)(μ-H), 3, in 4% yield. Compound 2 can be converted to 3 in 89% yield under an atmosphere of CO at 25 °C. Compound 3 is converted back to 2 when heated to 97 °C. Compounds 2 and 3 were both characterized by single-crystal X-ray diffraction analyses. Compound 2 contains a square pyramidal cluster of five Ruthenium Atoms with a μ5-carbido ligand. The SiEt3 ligand is coordinated to one of the basal Ruthenium Atoms. The Ru−Ru bond from this Ruthenium Atom to the apical Ruthenium Atom is unusually long at 3.1353(8) A. Compound 3 contains an open Ru5(μ5-C) cluster where one Ruthenium Atom bridges a butterfly arrangement of four Ruthenium Atoms. The silyl group is bonded to the bridging Ruthenium Atom, and the hydride ligand bridges the hinge bond of the butterfly.
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Further studies of the reactions of PtRu_5(μ_6-C)(CO)_16 with alkynes: The preparation and structural characterizations of PtRu_5(CO)_13(μ-EtC_2Et)(μ_3-EtC_2Et)(μ_5-C) and Pt_2Ru_6(CO)_17(μ-η^5-Et_4C_5)(μ_3-EtC_2Et) (μ_6-C)
Journal of Cluster Science, 1993Co-Authors: Richard D. AdamsAbstract:The reaction of PtRu_5(CO)_16(μ_6-C), 1 with 3-hexyne in the presence of UV irradiation produced two new electron-rich platinum-Ruthenium cluster complexes PtRu_5(CO)_13(μ-EtC_2Et)(μ_3-EtC_2Et)(μ_5-C), 2 (20% yield) and Pt_2Ru_6(CO)_17(μ-η^5-Et_4C_5)(μ_3-EtC_2Et) (μ_6-C), 3 (7% yield). Both compounds were characterized by single-crystal X-ray diffraction analyses. Compound 2 contains of a platinum capped square pyramidal cluster of five Ruthenium Atoms with the carbido ligand located in the center of the square pyramid. A EtC_2Et ligand bridges one of the PtRu_2 triangles and the Ru-Pt bond between the apical Ruthenium Atom and the platinum cap. The structure of compound 3 consists of an octahedral PtRu_5 cluster with an interstitial carbido ligand and a platinum Atom capping one of the PtRu_2 triangles. There is an additional Ru(CO)_2 group extending from the platinum Atom in the PtRu_5 cluster that contains a metallated tetraethylcyclopentadienyl ligand that bridges to the platinum capping group. There is also a EtC_2Et ligand bridging one of the PtRu_2 triangular faces to the capping platinum Atom. Compounds 2 and 3 both contain two valence electrons more than the number predicted by conventional electron counting theories, and both also possess unusually long metal-metal bonds that may be related to these anomalous electron configurations. Crystal data for 2 , space group Pna2_1, a =19.951(3) Å, b =9.905(2) Å, c =17.180(2) Å, Z =2, 1844 reflections, R =0.036; for 3 , space group Pna2_1, α =13.339(1) Å, b =14.671(2) Å, c =11.748(2) Å, α=100.18(1)°, β=95.79(1)°, γ=83.671(9)°, Z =2, 3127 reflections, R =0.026.
Chungu Xia - One of the best experts on this subject based on the ideXlab platform.
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Reaction of (Carbonyl)triRuthenium with Acetylferrocene Thiosemicarbazone : Synthesis, X-ray Diffraction, and Insight into the Solution Structures
European Journal of Inorganic Chemistry, 2008Co-Authors: Jing-mu Yang, Chungu XiaAbstract:Reaction of acetylferrocene thiosemicarbazone [L] with Ru3(CO)12 was investigated. Two new complexes, Ru3(CO)9[L-H] (1) and Ru2(CO)4[L]2 (2) were isolated. They were characterized by IR, 1H NMR, and 13C NMR spectroscopic analysis. The crystal structures of 1 and 2 were also determined. In trinuclear cluster 1, the acetylferrocene thiosemicarbazone ligand was deprotonated and acted as an N,S-chelating ligand as well as a sulfur bridge. Dinuclear compound 2 is the first bis(cycloruthenated acetylferrocene thiosemicarbazone) carbonyl derivative. This complex contains two Ruthenium Atoms in a dinuclear structure with a Cferrocene, N, S2, and (CO)2 coordination sphere for each Ruthenium Atom, as both L ligands act as a Cferrocene, N, S2 chelate, and sulfur bridge. The behavior of 1 and 2 under electrospray ionization mass spectrometry (ESI-MS) was studied and the key intermediate Ru(CO)2[L-H] (3) in the formation of 2 was directly detected in the reaction solution.(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)
Burjor Captain - One of the best experts on this subject based on the ideXlab platform.
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Oxidative Addition of Silanes to Ru5(CO)15(μ5-C) under Photolytic Conditions. The Synthesis and Structural Characterizations of Ru5(CO)14(SiEt3)(μ5-C)(μ-H) and Ru5(CO)15(SiEt3)(μ5-C)(μ-H)
Organometallics, 2000Co-Authors: Richard D. Adams, Burjor CaptainAbstract:The reaction of Ru5(CO)15(μ5-C), 1, with triethylsilane in the presence of UV−vis irradiation has yielded two new cluster complexes: Ru5(CO)14(SiEt3)(μ5-C)(μ-H), 2, in 11% yield and Ru5(CO)15(SiEt3)(μ5-C)(μ-H), 3, in 4% yield. Compound 2 can be converted to 3 in 89% yield under an atmosphere of CO at 25 °C. Compound 3 is converted back to 2 when heated to 97 °C. Compounds 2 and 3 were both characterized by single-crystal X-ray diffraction analyses. Compound 2 contains a square pyramidal cluster of five Ruthenium Atoms with a μ5-carbido ligand. The SiEt3 ligand is coordinated to one of the basal Ruthenium Atoms. The Ru−Ru bond from this Ruthenium Atom to the apical Ruthenium Atom is unusually long at 3.1353(8) A. Compound 3 contains an open Ru5(μ5-C) cluster where one Ruthenium Atom bridges a butterfly arrangement of four Ruthenium Atoms. The silyl group is bonded to the bridging Ruthenium Atom, and the hydride ligand bridges the hinge bond of the butterfly.
Anh Ngo - One of the best experts on this subject based on the ideXlab platform.
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A chiral molecular propeller designed for unidirectional rotations on a surface
Nature Communications, 2019Co-Authors: Yuan Zhang, Jan Patrick Calupitan, Tomas Rojas, Ryan Tumbleson, Guillaume Erbland, Claire Kammerer, Tolulope Michael Ajayi, Shaoze Wang, Larry Curtiss, Anh NgoAbstract:Synthetic molecular machines designed to operate on materials surfaces can convert energy into motion and they may be useful to incorporate into solid state devices. Here, we develop and characterize a multi-component molecular propeller that enables unidirectional rotations on a material surface when energized. Our propeller is composed of a rotator with three molecular blades linked via a Ruthenium Atom to a ratchet-shaped molecular gear. Upon adsorption on a gold crystal surface, the two dimensional nature of the surface breaks the symmetry and left or right tilting of the molecular gear-teeth induces chirality. The molecular gear dictates the rotational direction of the propellers and step-wise rotations can be induced by applying an electric field or using inelastic tunneling electrons from a scanning tunneling microscope tip. By means of scanning tunneling microscope manipulation and imaging, the rotation steps of individual molecular propellers are directly visualized, which confirms the unidirectional rotations of both left and right handed molecular propellers into clockwise and anticlockwise directions respectively.
Juan M. Fernández-g - One of the best experts on this subject based on the ideXlab platform.
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[2-(sec-Butyliminomethyl)quinoline]chlorido(η6-1-isopropyl-4-methylbenzene)Ruthenium(II) hexafluoridophosphate
Acta Crystallographica Section E Structure Reports Online, 2010Co-Authors: José Luis Gárate-morales, Simón Hernández-ortega, Juan M. Fernández-gAbstract:In the title compound, [RuCl(C10H14)(C14H16N2)]PF6, the aromatic ring of the isopropylmethylbenzene fragment shows an η6-arene coordination to the Ruthenium Atom. Its coordination sphere is completed by a chloride ligand and 2-(sec-butyliminomethyl)quinoline. The dihedral angle between the η6-arene ring and the quinoline Schiff base is 45.64 (9)°. The sec-butyl substituent and the PF6− anion are disordered over two positions with ratios of 0.595 (11):0.405 (11) and 0.752 (8):0.248 (8), respectively
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[2-(sec-Butyl-imino-meth-yl)quinoline]-chlorido(η-1-isopropyl-4-methyl-benzene)-Ruthenium(II) hexa-fluorido-phosphate.
Acta crystallographica. Section E Structure reports online, 2010Co-Authors: José Luis Gárate-morales, Simón Hernández-ortega, Juan M. Fernández-gAbstract:In the title compound, [RuCl(C(10)H(14))(C(14)H(16)N(2))]PF(6), the aromatic ring of the isopropyl-methyl-benzene fragment shows an η(6)-arene coordination to the Ruthenium Atom. Its coordination sphere is completed by a chloride ligand and 2-(sec-butyl-imino-meth-yl)quinoline. The dihedral angle between the η(6)-arene ring and the quinoline Schiff base is 45.64 (9)°. The sec-butyl substituent and the PF(6) (-) anion are disordered over two positions with ratios of 0.595 (11):0.405 (11) and 0.752 (8):0.248 (8), respectively.