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Multinuclear NMR (multinuclear + nmr)

Distribution by Scientific Domains
Chemistry100%

Terms modified by Multinuclear NMR

  • multinuclear nmr spectroscopy
    		•

    Selected Abstracts

    Insertion Reactions of an Aminogermylene and Formation of a Single-Source Precursor for GeTe Thin Films

    EUROPEAN JOURNAL OF INORGANIC CHEMISTRY, Issue 14 2009
    Tianniu Chen
    Abstract Insertion reactions between a liquid germylene 1, and either a carbodiimide or dialkyl telluride lead to the formation of the group-14-metal(II) guanidinate complex 2 or the stable group-14-metal terminal alkyl tellurolate compound 3, respectively. The complexes 2 and 3 were structurally elucidated by multinuclear NMR and single-crystal X-ray crystallography. The use of 3 as a single-source precursor (SSP) for the MOCVD of GeTe films was demonstrated. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009) [source]

    Palladium(II) Phosphotungstate Derivatives: Synthesis and Characterization of the [Pdx{WO(H2O)}3,x{A,,-PW9O34}2](6+2x), Anions

    EUROPEAN JOURNAL OF INORGANIC CHEMISTRY, Issue 4 2009
    Richard Villanneau
    Abstract A series of PdII derivatives of the [P2W21O71(H2O)3]6, heteropolytungstate with the general formula [Pdx{WO(H2O)}3,x{A,,-PW9O34}2](6+2x), (x = 1,3) is described. These compounds are obtained by the reaction between [PdII(NO3)2]·H2O and the corresponding vacant polyoxometalates in water. They are characterized by IR and multinuclear NMR (31P and 183W) spectroscopy. Compound K10[Pd2{WO(H2O)}{A,,-PW9O34}2]·30H2O was characterized by XRD: it crystallized in the orthorhombic space group Pcmn with parameters a = 18.119(3) Å, b = 19.729(3) Å, c = 24.856(5) Å, V = 8886(3) Å3.(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009) [source]

    Phosphorus heterocycles from 2-(2-hydroxyphenyl)-1H -benzimidazole

    HETEROATOM CHEMISTRY, Issue 4 2004
    Julio Hernández-Díaz
    Sixteen different P(III) and P(V) heterocycles derived from 2-(2-hydroxyphenyl)-1H-benzimidazole (1) are reported. In these heterocycles the phosphorus atom is part of a six-membered unsaturated ring. They were mainly studied by multinuclear NMR. The X-ray diffraction of 3,4- benzimidazole-5,6-benzo-2-dimethylamino-2-seleno- 1,3,2-oxazaphosphorinane is reported. Phosphoranes derived from 1 and 3,5-di-tert-butylcatechol, and bearing Cl, NMe2, or phenyl as substituent at phosphorus are presented. © 2004 Wiley Periodicals, Inc. Heteroatom Chem 15:307,320, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/hc.20021 [source]

    Synthesis, characterization, and structural investigations of 1-amino-3-substituted-1,2,3-triazolium salts, and a new route to 1-substituted-1,2,3-triazoles

    JOURNAL OF HETEROCYCLIC CHEMISTRY, Issue 1 2005
    Greg Kaplan
    Quarternary salts based upon 3-alkyl substituted 1-amino-1,2,3-triazolium cations (alkyl = methyl, ethyl, nypropyl, 2-propenyl, and n -butyl) have been synthesized and characterized by vibrational spectra, multinuclear NMR, elemental analysis, and DSC studies. Subsequent diazotization of these salts results in the exclusive formation of 1-alkyl-1,2,3-triazoles. Single crystal X-ray studies were carried out for 1-amino-3-methyl-1,2,3-triazolium iodide, 1-amino-3-ethyl-1,2,3-triazolium bromide, 1-amino-3- n -propyl-1,2,3-triazolium bromide, and 1-amino-3- n -butyl-1,2,3-triazolium bromide as well as the starting heterocycle, 1-amino-1,2,3-triazole, and all of the structures are discussed. [source]

    Restricted rotation/tautomeric equilibrium and determination of the site and extent of protonation in bi-imidazole nucleosides by multinuclear NMR and GIAO-DFT calculations

    JOURNAL OF PHYSICAL ORGANIC CHEMISTRY, Issue 3 2005
    Jukka Mäki
    Abstract The restricted rotation about the conjoining bond in a series of 4,-substituted bi-imidazole nucleosides {5-amino-4-[4,-R-imidazol-2,-yl]-1-(,- d -ribofuranosyl)-1H -imidazole; where R=H, methyl, hydroxymethyl, oxalo, formyl} due to intramolecular hydrogen bonding between N-3, and the N-6 protons concomitant with prototropic tautomerism has been examined using multinuclear (1H, 13C and 15N) experimental NMR. Substitution at the 4, position causes the interconversion, whilst still an intramolecular process, to yield complex spectra as the dynamic process consists of a two-site exchange between non-degenerate tautomeric forms (asymmetric sites). The preferred tautomers were identified experimentally in each case and compared with theoretically determined structures geometry optimized using density functional theory (DFT) at the B3LYP/6,31G(d,p) level of theory on which gauge-independent atomic orbital-DFT (GIAO-DFT) computations at the B3LYP/cc-pVTZ level of theory were applied to calculate the chemical shifts of the 1H, 13C and 15N nuclei. Both the site and the extent of protonation of the bi-imidazole nucleosides were also similarly ascertained using the same methodology. Protonation at the pyridine-type nitrogen (N-3,) of the outer imidazole ring, the principle site of protonation, effectively eliminated the barrier to rotation about the conjoining bond yielding time-averaged spectra experimentally. Copyright © 2004 John Wiley & Sons, Ltd. [source]

    Two novel diorganotin phosphonic diamides: syntheses, crystal structures, spectral properties and in vitro antibacterial studies

    APPLIED ORGANOMETALLIC CHEMISTRY, Issue 10 2010
    Khodayar Gholivand
    Abstract Two diorganotin complexes with general formulae SnCl2(CH3)2[C6H5P(O)(NHCH(CH3)2)2]2 (1) and SnCl2(CH3)2[C6H5P(O) (NHC(CH3)3)2] (2) were prepared by the addition of one equivalent SnCl2Me2 to two equivalents of PhP(O)(NHiPr)2 and PhP(O)(NHtBu)2, respectively. The compounds were characterized by elemental analysis, IR and multinuclear NMR (1H, 13C, 31P and 119Sn) spectroscopy. The crystal structures of the complexes were determined by X-ray single crystal analysis, which revealed that complex 1 has a distorted octahedral geometry and complex 2 has a distorted trigonal bipyramidal structure with non-equivalent chlorine atoms. Preliminary antibacterial tests of the compounds against Gram-positive and -negative bacteria were carried out using the filter paper disk method and chloroamphenicol was used as standard for comparison. Copyright © 2010 John Wiley & Sons, Ltd. [source]

    Polyhedral oligomeric silsesquioxane-bound iminofullerene

    APPLIED ORGANOMETALLIC CHEMISTRY, Issue 3 2010
    David J. Clarke
    Abstract Polyhedral oligomeric silsesquioxane (POSS) cages containing an iminofullerene species are reported herein. Monosubstituted benzyl chloride POSS was synthesized, and subsequently reacted with sodium azide to form mono benzyl azide POSS. The azide was subsequently reacted with C60 in anhydrous, degassed toluene to yield the desired POSS iminofullerene compound. The prepared compounds were characterized by multinuclear NMR, electrospray mass spectrometry, elemental analysis, UV,vis, fluorescence and optical power limiting measurements. Copyright © 2009 John Wiley & Sons, Ltd. [source]

    Polyhedral oligomeric silsesquioxane bound fulleropyrrolidines

    APPLIED ORGANOMETALLIC CHEMISTRY, Issue 8 2008
    David J. Clarke
    Abstract The first reported examples of polyhedral oligomeric silsesquioxane (POSS) cages containing a fulleropyrrolidine species are reported herein. Monosubstituted POSS-dioxalane species were synthesized through the hydrosilylation of a silyl-dioxalane with mono-vinyl substituted POSS. Subsequent deprotection yielded the desired aldehyde functionality. An alternative synthetic pathway, involving the nucleophilic substitution of mono-benzyl chloride POSS with 4-hydroxybenzaldehyde yielded the desired aldehyde functionality. Each mono-aldehyde POSS was then reacted with N -methylglycine and C60 to yield the desired POSS fulleropyrrolidines. The prepared compounds were characterized by multinuclear NMR, electrospray mass spectrometry, elemental analysis, UV,vis, fluorescence and optical power limiting measurements. Copyright © 2008 John Wiley & Sons, Ltd. [source]

    Synthesis, spectral and antimicrobial studies of diorganotin(IV)3(2,-hydroxyphenyl)-5-(4-substituted phenyl) pyrazolinates

    APPLIED ORGANOMETALLIC CHEMISTRY, Issue 10 2006
    U. N. Tripathi
    Abstract Diorganotin(IV) dipyrazolinates of the type R2Sn(C15H12N2OX)2 [where C15H12N2OX = 3(2,-Hydroxyphenyl)-5(4-X-phenyl)pyrazoline {where X = H (a); CH3 (b); OCH3 (c); Cl (d) and R = Me, Prn and Ph}] have been synthesized by the reaction of R2SnCl2 with sodium salt of pyrazolines in 1:2 molar ratio, in anhydrous benzene. These newly synthesized derivatives have been characterized by elemental analysis (C, H, N, Cl and Sn), molecular weight measurement as well as spectral [IR and multinuclear NMR (1H, 13C and 119Sn)] studies. The bidentate behaviour of the pyrazoline ligands was confirmed by IR, 1H and 13C NMR spectral data. A distorted trans -octahedral structure around tin(IV) atom for R2Sn(C15H12N2OX)2 has been suggested. The free pyrazoline and diorganotin(IV) dipyrazolinates have also been screened for their antibacterial and antifungal activities. Some diorganotin(IV) dipyrazolinates exhibit higher antibacterial and antifungal effect than free ligand and some of the antibiotics. Copyright © 2006 John Wiley & Sons, Ltd. [source]