135 research outputs found
Tin(II) and Lead(II) 4-Acyl-5-pyrazolonates: Synthesis, Spectroscopic and X-ray Structural Characterization
No full textStructures with interesting and instructional features from a discovery-based molecular structure determination lab module for undergraduates since 2010
No full textFactors Influencing Coordination versus Oxidative Addition of C−H Bonds to Molybdenum and Tungsten: Structural and Spectroscopic Evidence That the Calixarene Framework Promotes C−H Bond Activation
No full textMo(PMe3)6 and W(PMe3)4(η2-CH2PMe2)H react with
the diphenol CH2(ArMe2OH)2 (ArMe2 = C6H2Me2) to yield [κ2,η2-CH2(ArMe2O)2]M(PMe3)3H2 (M = Mo, W), which possess agostic
M−H−C interactions. NMR spectroscopic studies provide
evidence that the tungsten compound is in facile equilibrium
with the metalated trihydride [κ3-CH(ArMe2O)2]W(PMe3)3H3
Factors Influencing Coordination versus Oxidative Addition of C−H Bonds to Molybdenum and Tungsten: Structural and Spectroscopic Evidence That the Calixarene Framework Promotes C−H Bond Activation
No full textMo(PMe3)6 and W(PMe3)4(η2-CH2PMe2)H react with
the diphenol CH2(ArMe2OH)2 (ArMe2 = C6H2Me2) to yield [κ2,η2-CH2(ArMe2O)2]M(PMe3)3H2 (M = Mo, W), which possess agostic
M−H−C interactions. NMR spectroscopic studies provide
evidence that the tungsten compound is in facile equilibrium
with the metalated trihydride [κ3-CH(ArMe2O)2]W(PMe3)3H3
Factors Influencing Coordination versus Oxidative Addition of C−H Bonds to Molybdenum and Tungsten: Structural and Spectroscopic Evidence That the Calixarene Framework Promotes C−H Bond Activation
No full textMo(PMe3)6 and W(PMe3)4(η2-CH2PMe2)H react with
the diphenol CH2(ArMe2OH)2 (ArMe2 = C6H2Me2) to yield [κ2,η2-CH2(ArMe2O)2]M(PMe3)3H2 (M = Mo, W), which possess agostic
M−H−C interactions. NMR spectroscopic studies provide
evidence that the tungsten compound is in facile equilibrium
with the metalated trihydride [κ3-CH(ArMe2O)2]W(PMe3)3H3
Factors Influencing Coordination versus Oxidative Addition of C−H Bonds to Molybdenum and Tungsten: Structural and Spectroscopic Evidence That the Calixarene Framework Promotes C−H Bond Activation
No full textMo(PMe3)6 and W(PMe3)4(η2-CH2PMe2)H react with
the diphenol CH2(ArMe2OH)2 (ArMe2 = C6H2Me2) to yield [κ2,η2-CH2(ArMe2O)2]M(PMe3)3H2 (M = Mo, W), which possess agostic
M−H−C interactions. NMR spectroscopic studies provide
evidence that the tungsten compound is in facile equilibrium
with the metalated trihydride [κ3-CH(ArMe2O)2]W(PMe3)3H3
Factors Influencing Coordination versus Oxidative Addition of C−H Bonds to Molybdenum and Tungsten: Structural and Spectroscopic Evidence That the Calixarene Framework Promotes C−H Bond Activation
No full textMo(PMe3)6 and W(PMe3)4(η2-CH2PMe2)H react with
the diphenol CH2(ArMe2OH)2 (ArMe2 = C6H2Me2) to yield [κ2,η2-CH2(ArMe2O)2]M(PMe3)3H2 (M = Mo, W), which possess agostic
M−H−C interactions. NMR spectroscopic studies provide
evidence that the tungsten compound is in facile equilibrium
with the metalated trihydride [κ3-CH(ArMe2O)2]W(PMe3)3H3
Dimethyl(2,2′:6′,2′′-terpyridine-κ3N,N′,N′′)zinc(II)
No full textThe title compound, [Zn(CH3)2(C15H11N3)], was synthesized by the addition of dimethylzinc to 2,2′:6′,2′′-terpyridine and was crystallized by the slow evaporation of THF. The pentacoordinate ZnII atom, lying on a twofold rotation axis, displays a distorted trigonal-bipyramidal geometry, with two terminal N atoms at the axial positions and the central N atom and two methyl C atoms at the equatorial positions
Covalent Metal−Organic Networks: Pyridines Induce 2-Dimensional Oligomerization of (μ-OC<sub>6</sub>H<sub>4</sub>O)<sub>2</sub>Mpy<sub>2</sub> (M = Ti, V, Zr)
No full textTreatment of M(OiPr)4 (M = Ti, V) and [Zr(OEt)4]4 with excess 1,4-HOC6H4OH in THF afforded
[M(OC6H4O)a(OC6H4OH)3.34-1.83a(OiPr)0.66-0.17a(THF)0.2]n (M = Ti, 1-Ti; V, 1-V, 0.91 ≤ a ≤ 1.82) and [Zr(1,4-OC6H4O)2-x(OEt)2x]n (1-Zr, x = 0.9). The combination of of 1-M (M = Ti, V, Zr) or M(OiPr)4 (M = Ti, V),
excess 1,4- or 1,3-HOC6H4OH, and pyridine or 4-phenylpyridine at 100 °C for 1 d to 2 weeks afforded various
2-dimensional covalent metal−organic networks: [cis-M(μ1,4-OC6H4O)2py2]∞ (2-M, M = Ti, Zr), [trans-M(μ1,4-OC6H4O)2py2·py]∞ (3-M, M = Ti, V), solid solutions [trans-TixV1-x(μ1,4-OC6H4O)2py2·py]∞ (3-TixV1-x, x ≈ 0.4,
0.6, 0.9), [trans-M(μ1,4-OC6H4O)2(4-Ph-py)2]∞ (4-M, M = Ti, V), [trans-Ti(μ1,3-OC6H4O)2py2]∞ (5-Ti), and [trans-Ti(μ1,3-OC6H4O)2(4-Ph-py)2]∞ (6-Ti). Single-crystal X-ray diffraction experiments confirmed the pleated sheet
structure of 2-Ti, the flat sheet structure of 3-Ti, and the rippled sheet structures of 4-Ti, 5-Ti, and 6-Ti. Through
protolytic quenching studies and by correspondence of powder XRD patterns with known titanium species, the
remaining complexes were structurally assigned. With py or 4-Ph-py present, aggregation of titanium centers is
disrupted, relegating the building block to the cis- or trans-(ArO)4Tipy2 core. The sheet structure types are
determined by the size of the metal and the interpenetration of the layers, which occurs primarily through the
pyridine residues and inhibits intercalation chemistry
[(4R,5R)-(2,2-Dimethyl-1,3-dioxolane-4,5-diyl)bis(diphenylmethanolato)-&#954;2O:O&#8242;]bis(N-methylmethanaminato)titanium(IV)
No full textIn the title four-coordinate complex, [Ti(C2H6N)2(C31H28O4)], two symmetry-independent molecules are present in the asymmetric unit. The TiIV atom displays a distorted tetrahedral geometry, with Ti&#8212;O bond lengths ranging from 1.805&#8197;(3) to 1.830&#8197;(3)&#8197;&#197; and O&#8212;Ti&#8212;O ligand bite angles of 100.16&#8197;(12) and 101.36&#8197;(12)&#176;. The short Ti&#8212;N bond distances, ranging from 1.877&#8197;(4) to 1.905&#8197;(4)&#8197;&#197;, indicate strong bonding between the TiIV atom and the dimethylamide ligands
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