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Showing 1 to 20 of 64 for “"Dinitrogen"”.
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Dinitrogen fixation chemistry of a molybdenum trisanilide system
Dinitrogen cleavage by Mo(N[t-Bu]Ar)3 (Ar = 3,5-C6H3Me2) proceeds through the intermediate ([mu]-N2)[Mo(N[t-Bu]Ar)3]2 before forming N=Mo(N[t-Bu]Ar)3 as the product. Both the intermediate bridging N2 complex and the nitride product have been structurally characterized by single-crystal X-ray …
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Nitrogen-Dioxide and Dinitrogen-Tetroxide Simultaneous Reactions With Water
Made available in DSpace on 2014-12-05T17:15:28Z (GMT). No. of bitstreams: 1 6000158.pdf: 3518721 bytes, checksum: 1e9e4edd9af1da15f0ff00651e053eea (MD5) Previous issue date: 1959
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Dinitrogen complexes of titanium and vanadium stabilized by phosphine ligands
… this thesis is to investigate the preparation of dinitrogen complexes of titanium and vanadium from phosphine-based starting materials. The reactions of TiCl₄, TiCl₃(THF)₃, or VCl₂(TMEDA)₂ with LiN(SiMe₂CH₂PR₂)₂ (R = isopropyl or methyl) yielded the new phosphine complexes TiCl₃[N(SiMe₂CH₂PPri₂)₂] …
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Ligand-Induced Cleavage Of Dinitrogen By A Hafnium Metallocene Complex
Side-on bound dinitrogen complexes of zirconium and hafnium, [([eta]5C5Me3H2)2M]2([eta]2, [eta]2-N2) (M = Zr, Hf), have been prepared by alkali metal reduction of the corresponding diiodide precursors. UV-Visible spectroscopy and X-ray diffraction studies established a higher degree of N2 …
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Dinitrogen and organometallic chemistry of trimethylsilyl-substituted triamidoamine complexes of molybdenum
… reduction of [N3N]MoCl by magnesium powder under dinitrogen, serves as an entry into the dinitrogen chemistry of molybdenum complexes containing the TMS-TREN ligand. ... Five coordinate tungsten oxo alkylidene complexes of the general type (ArO)2W(O)(CHtBu)(PR 3 ) (Ar = 2,6-Ph2C6H3 ) are …
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Synthesis and studies of molybdenum and tungsten complexes for dinitrogen reduction
… of [HIPTtrpn]MoCl by KC8 under an atmosphere of dinitrogen leads to the green species [HIPTtrpn]MoNNK which can be oxidized by ZnCl2(dioxane) to produce [HIPTtrpn]Mo(N2). Other complexes synthesized include {[HIPTtrpn]Mo(NH3)}+ salts and [HIPTtrpn]Mo(CO). Xray studies were carried out on …
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Evolution of Dinitrogen and Nitrous Oxide From Soils Treated With Nitrogen-15-Labeled Fertilizer
… capable of reducing nitrate (NO(,3)('-)) to dinitrogen (N(,2)) and nitrous oxide (N(,2)O), the significance of denitrification under field conditions is still largely unknown because of difficulties associated with its measurement. These difficulties arise from the fact that one of the …
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Electronic structure analyses and activation studies of a dinitrogen-derived terminal nitride of molybdenum
… Complexes obtained by electrophilic attack on a dinitrogen-derived terminal molybdenum nitride: Electronic structure analysis by solid state CP/MAS ¹⁵N NMR in combination ... Chapter 2. Carbene chemistry in the activation of a dinitrogen-derived terminal nitride of molybdenum ... Chapter 3. …
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Heterogeneous Reactions of Nitric Acid and Dinitrogen Pentoxide on Mineral Dust Surfaces: A Knudsen Reactor Study
The heterogeneous reactions of nitric acid and dinitrogen pentoxide with various authentic dust, mineral and clay mineral surfaces has been investigated my means of the Knudsen reactor techique at room temperature. Authentic dust surfaces from the Saharan, the Chinese and the Arizona dust regions …
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Characterization of Denitrification and Leaching Losses of Fertilizer Nitrogen From Soil (Evolution, Isotope, Nitrous Oxide, Dinitrogen)
Quantification of leaching and denitrification losses of fertilizer N from soil requires that appropriate methods be developed for their measurement. The objectives of this work were to: (1) evaluate potential errors in measuring denitrification by use of ('15)N-tracer techniques recently developed …
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Complexation, coupling, and cleavage of organonitriles, alkynes, dinitrogen, hydrostannanes or phosphines by three-coordinate molybdenum(III) complexes
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Chemistry, February 2002.
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Contribution of Nitrate and Dinitrogen to Total Plant Nitrogen and Seed Protein in Soybeans (Glycine Max (L.) Merr.)
Made available in DSpace on 2014-12-14T14:37:27Z (GMT). No. of bitstreams: 1 7913373.pdf: 1959493 bytes, checksum: 435148a63db0d02221ec516520659862 (MD5) Previous issue date: 1978
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Vanadium and chromium complexes supported by sterically demanding ligands : studies relevant to the reduction of dinitrogen to ammonia
Chapter 1. Using the [HIPTN3N]3- ligand ([HIPTN3N]3- = [(HIPTNCH2CH2)3N]3-; HIPT = 3,5-(2,4,6-i-Pr3C6H2)2C6H3 = HexaIsoPropylTerphenyl), green paramagnetic [HIPTN3N]V(THF) (1) can be prepared from VCl3(THF)3. Reduction of 1 with potassium graphite in ethereal solvents yields a highly sensitive red …
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Synthetic and mechanistic study of catalytic dintrogen reduction
The dinitrogen reduction capability of a series of new triamidoamine based molybdenum compounds has been studied. The synthesis of a number of different triamidoamine ligands, and their resulting molybdenum compounds, is described. While symmetric variants containing electron-withdrawing …
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Continued investigations of the catalytic reduction of N₂ to NH₃ by molybdenum triamidoamine complexes
… of dihydrogen during the catalytic reduction of dinitrogen to ammonia with [HIPTN 3N]Mo complexes was completed. During a catalytic reaction, the use of different solvents including fluorobenzene, THF, and toluene did not produce catalytic turnover of ammonia from dinitrogen. The acid source used …
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Physiological and nutritional changes in nitrogen fixing trees associated with autumnal senescence and chilling
… distinct sites in central Illinois, USA. The dinitrogen fixing species, actinorhizal (Frankia-nodulated) autumn olive and leguminous black locust (Rhizobium-nodulated), resorbed proportionally more net phosphorus (P) than nitrogen (N) from leaves prior to autumnal leaf abscission than the …
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Controlling the reactivity of Mo(III) with di- and tri-atomic molecules via sterically demanding ligands
Chapter 1. Molybdenum Dinitrogen Chemistry: Formation and Reactivity of (Ar[tBu]N)3MoN2- A collection of (Ar[tBu]N)3MoN2- compounds, supported with Na+, K+, Mg2+ and Ca2+ have been prepared through a variety of synthetic routes. In several experiments, N2 was replaced with other small molecules to …
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Geometrical Analogues of Purine Substrates (5-Methyladenine, Pyrolysis, Diazabiphenylene)
… was prepared by thermal extrusion of dinitrogen. As expected of biphenylene analogues with increased electron density in the four-membered ring, the benzocyclobutadienoimidazole underwent extensive decomposition.
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The Synthesis and Reactions of 2-Diazo-4,5-Bis(trifluoromethyl)imidazole, a Carbene Precursor to Stable Ylide and Hypervalent Compounds
… of 1.089 A. It may be considered as an ylide of dinitrogen.
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