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Showing 1 to 20 of 69 for “"Nitrogen atoms"”.
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Calculated and measured line intensity ratios of singly and doubly ionized nitrogen atoms in hydrogen plasma
The oscillator strengths of several NII and NIII lines in the optical wavelength region are calculated by means of the Coulomb approximation. Atomic processes in a plasma are discussed, as well as two models (LTE and semi-coronal) which can be used to determine the line intensity ratios of …
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ΑΖΩΤΟΥΧΑ ΠΑΡΑΓΩΓΑ ΤΟΥ ΤΕΤΡΑΘΕΙΑΦΟΥΛΒΑΛΕΝΙΟΥ ΚΑΙ ΤΕΤΡΑΣΕΛΗΝΑΦΟΥΛΒΑΛΕΝΙΟΥ ΚΑΙ ΑΓΩΓΙΜΑ ΑΛΑΤΑ ΑΥΤΩΝ
… AND TETRASELENAFULVALENES (Π- DONORS) CONTAINING NITROGEN ATOMS WERE SYNTHESIZED AND CHARACTERIZED BY ELEMENTAL ANALYSIS AND VARIOUS SPECTROSCOPIC TECHNIQUES. NITROGEN ATOMS HAVE BEEN INTRODUCED IN Π-DONORS MOLECULE IN THE FORM OF PYRAZINE, QUINOXALINE PARIDINOPYRAZINE AND PYRIDINE RINGS. SEVERAL …
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S=N versus S+-N-
… was to characterise structurally four sulfur-nitrogen compounds in terms of their experimental electron density distribution: Sulfurdiimide S(NtBu)2 (I), sulfurtriimide S(NtBu)3 (II), methyl(diimido)sulfinic acid H(NtBu)2SMe (III) and methylene-bis(triimido)sulfonic acid CH2{S(NtBu)2(HNtBu)}2 …
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Spectroscopic studies of some heterocyclic hydrazones and their metal complexes
… involving the lone pair electrons of the ring nitrogen atoms, whereas the Z-isomer association is a dipole-dipole interaction involving the aldehyde ring of different PAPHY molecules. Evidence from long range coupling shows that the uncomplexed E and Z-PAPHY molecules possess a different …
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A study of the displacement of halogen from chlorinated heteroaromatic azines by dialkali salts of benzoylacetone, disodio salts of certain 2-hydroxy-4-methylpyrimidines, and the methylsulfinyl carbanion
… six or ten w-electron system and one or two ring nitrogens, have been shown to undergo nucleophilic displacement of halide ion with a variety of nucleophiles. A detailed review of the relative reactivity of compounds of these classes, as well as halogenated heteroaromatic azines containing as many …
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Configurationally restricted bis-tetraazamacrocyclic complexes: chemokine receptor antagonists
… possessing an ethylene bridge between adjacent nitrogen atoms are fixed in the trans-II configuration and that complexes containing an ethylene bridge between non-adjacent nitrogen atoms adopt the cis-V configuration. In addition, solution EXAFS has been used as a model to probe the binding of …
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Tetraazamacrocyclic ligands and their copper complexes
… contain a dioxo linkage between the anilino nitrogen atoms. An X-ray structure determination of [5,12-diphenyl-18,19-dioxo-9,10,17,18,19,20-hexahydrodibenzo (e,m) (1,4,8,11) tetraazacyclotetradecinato(2-)]-dimethylformamidocopper II dihydrate indicates steric crowding for the phenyl …
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The Reaction of a Water Soluble Platinum Compound with Methionine and Derivatives
… methionine ratios, chelates with the sulfur and nitrogen atoms of the methionine are dominant; at lower Pt: methionine ratios, a bis-methionine product is formed. The en ligand is displaced by methionine but not N-acetylmethionine.
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Design and Synthesis of Novel Cage-Functionalized Crown Ethers: A New Class of Ag Complexants.
… groups may cooperate, and the piperazine nitrogen atoms provide unshared electrons, which may form a complex with Ag+. In addition, relatively soft donor atoms (e.g., Br) are well-suited for complexation with Ag+, which is a softer Lewis acid than alkali metal cations.
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Novel dianionic sulfur ylides and related compounds
Priority task of the thesis was to replace oxygen atoms in sulfur oxoanions SOnm– or imido groups in sulfur polyimido anions S(NR)nm– isoelectronically by R2C-methylene groups. This would open a wide avenue to new target molecules containing a formally double bonded carbon next to formally double …
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Structural variations in metal ion complexes of the ligand EGTA⁴-
… of the EGTA^4- ligand. The ether oxygen atoms are bound at a shorter distance than the amine nitrogen atoms. EGTA^4 - is octadentate toward both the strontium and barium ions, which are nine- and ten-coordinate, respectively. The magnesium complex is dinuclear, utilizing each end of the …
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Synthesis of 1-chloro-1,2,4,6-selenatriazines and some products of reduction
… measured all radicals coupling to three unique nitrogen atoms with 7 broad lines. There is no resolvable hyperfine coupling to 77Se, 37Cl/19F and phenyl protons.
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Synthesis and electrochemistry of 1,2,4,6-thiatriazine radicals
… diagnostic and display coupling to three unique nitrogen atoms, of which a small but very distinct influence on the hyperfine coupling constants from the remote aryl-substituents is seen. Solution electrochemistry assessed the redox tunability of the radicals to these substituents. DFT …
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Copper complexes of dinucleating octa-azamacrocyclic ligands
… complexes (formed by deprotonation of anilino nitrogen atoms) a novel synthetic route had to be used to overcome problems associated with the very low solubility of both ligand and complex.
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The Interaction of Carbon Monoxide With Nitric Oxide and Hydrogen on Platinum
… mechanism, i.e. reaction between adsorbed nitrogen atoms and weakly bound NO molecules. Annealing experiment indicates that a surface reconstruction takes place during heating cycle of an NO adlayer at 120 K. Pt(410) is also found to be unusually reactive in decomposition of CO. This …
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Structure and thermodynamics of Diol inclusion compounds
… (1) with compounds containing neutral nitrogen atoms (Lewis bases). The structures of inclusion compounds with two nitriles (acetonitrile and 3- hydroxypropionitrile), with pyridine and with three substituted pyridines (3- methylpyridine, 2,4-dimethylpyridine and 2,6-dimethylpyridine) …
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Development of electronic structure and kinetics methods for the rational design of electrocatalysts
… (DFT) on a class of GCCs containing cationic nitrogen atoms, which are particularly active for catalyzing the oxygen reduction reaction (ORR). Using a mixture of high-throughput screening, statistical analysis, and computational exploration guided by chemical intuition, we design several novel …
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Synthesis And Characterization Of Metal Complexes Containing Tetrazolate, Poly(tetrazolyl)borate, And Poly(azolyl)aluminate Ligands As High Energy Density Materials
… groups block coordination to the 1- and 4-nitrogen atoms, resulting in monomer formation. The first example of a trihydro(tetrazolyl)borate was prepared, and its bonding is heavily influenced by the basic BH3 moiety. 18-Crown-6 adducts of dihydrobis(tetrazolyl)borate complexes have been …
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Applications of electron energy loss spectroscopies to the study of surface chemistry
… grown on Ni(100) and Ni(110) surface and (2) nitrogen atom overlayer on Cu(100) and Cu(110) surfaces. EXELFS spectra obtained from the K-level of oxygen in NiO film grown on both the Ni(100) and Ni(110) surfaces reveal that the NiO films grown on both surfaces have the same structure as bulk …
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Synthesis and characterization of metal complexes 2-Benzoylpyridene and di-2-pyridyl ketone schiff base ligands derived from s-methyldithiocarbazate fragment and its application to biological activity toward P.Falciparum
… deprotonated form through one of the pyridine nitrogen atoms, the azomethine nitrogen atom and the thiolate sulfur atom, thus HL1 and HL2 behaved as tridentate N, N, S chelate with all coordinated respective metal ions centers. The synthesized ligands and their corresponding metal complexes …
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