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  • 1
    Electronic Resource
    Electronic Resource
    Molecular structure of the dimeric complex of copper (II) chloride with triphenyl-N-[6-methylpyridyl-2]phosphinimine (1993)
    Springer
    Russian chemical bulletin 42 (1993), S. 295-299 
    Details
    ISSN: 1573-9171
    Keywords: triphenyl-N-(6-methylpyridyl-2)phosphinimine ; iminophosphoranes, complexes with copper(II) ; X-ray diffraction ; ESR data
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The complex of copper(II) dichloride with triphenyl-N-(6-methylpyridyl-2)phosphinimine has been studied by X-ray diffraction. This compound has a dimeric structure with two μ2-bridge chlorine atoms. The coordination of copper atoms by three chlorine atoms and the N atom of the heterocycle is of a strongly distorted planar-square type. A peculiar feature of this structure is the presence of intramolecular contacts Cu...N (2.504 Å and 2.492 Å) involving the imine nitrogens of the P,N-containing ligands which are responsible for strong additional coordination of the copper atoms. In methanol the P,N-containing ligand forms a complex with Cu(II) where the metal-to-ligand ratio is equal to 1∶2. The ESR data point to the bidentate nature of the ligand in solution, where all four nitrogen atoms, contributed by both of the ligands, are located in the plane of the metal atom.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00697080
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  • 2
    Electronic Resource
    Electronic Resource
    Molecular structure of the cobalt(ii) chloride complex with triphenyl-N-(2-pyrimidyl)phosphineimine (1993)
    Springer
    Russian chemical bulletin 42 (1993), S. 1144-1148 
    Details
    ISSN: 1573-9171
    Keywords: triphenyl-N-(2-pyrimidyl)phosphineimine ; X-ray structural study ; cobalt(ii) chloride ; iminophosphoranes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract An X-ray structural study of the cobalt(ii) chloride complex with triphenyl-N-(2-pyrimidyl)phosphineimine has been performed (automatic diffractometer, λMo-−K α, 2916 observed reflections, the heavy-atom method, the least squares method in anisotropicisotropic approximation toR=0.043). The crystals are monoclinic,a=15.979(6) Å,b=17.391(6) Å,c=14.976(6) Å, β=104.21(2)°,V=4034(5) Å3,d calc=1.384 g cm−3,Z=4, space groupP21/c. The Co atom has a distorted tetrahedral coordination by two Cl atoms (2.268(2) Å and 2.278(3) Å) and two N atoms (2.030(4) Å and 2.025(5) Å) of the two pyrimidine heterocycles. The Cl-Co-Cl and N-Co-N bond angles are equal to 107.7(1)° and 123.4(2)°, respectively. Additional weak coordination of the Co atom by two N atoms of the imine groups [Co...N 2.982(4) Å and 3.045(4) Å] is also observed in the molecule of the complex, and this coordination changes the nearest environment of the Co atom to distorted octahedral coordination. The lengths of the phosphorus-imine P=N bonds are 1.596(6) Å and 1.585(6) Å. The results obtained are compared with previous structural investigations of similar complexes of transition metals with iminophosphoranes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00701992
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  • 3
    Electronic Resource
    Electronic Resource
    Some properties of 1-phosphorus(IV)-substituted cycloalkanecarboxylic acids and their derivatives (1992)
    Springer
    Russian chemical bulletin 41 (1992), S. 1466-1473 
    Details
    ISSN: 1573-9171
    Keywords: cycloalkylphosphonates ; cycloalkylphosphinates ; cycloalkylphosphine oxides ; cycloalkanecarboxylic acids ; x-ray structural analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract An x-ray structural study of single crystals of 1-diphenylphosphinyl-cyclo-propane- and 1-diphenylphosphinylcyclobutanecarboxylic acids was conducted. 1-Phosphorylated cycloalkanecarboxylic acid amides were obtained from the corresponding acids by the reaction with thionyl chloride with subsequent treatment with primary and secondary amines. It was shown that the reaction of 1-phosphorylated 1-functional substituted cycloalkanes with trimethylbromosilane takes place with preservation of the cyclic structure and yields phosphoric acid silyl esters, and the corresponding cycloalkylphosphonic and cycloalkylphosphinic acids were synthesized by their hydrolysis in soft conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00864348
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  • 4
    Electronic Resource
    Electronic Resource
    Protonation of triethyl (2-pyridylimido)phosphates (1993)
    Springer
    Russian chemical bulletin 42 (1993), S. 77-81 
    Details
    ISSN: 1573-9171
    Keywords: protonation ; pyridylimidophosphates ; X-ray structure analysis ; IR and NMR spectra ; protonated cation structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Protonation of triethyl (2-pyridylimido)phosphates has been studied by potentiometric titration in nitromethane, IR and NMR spectroscopy, and X-ray structure analysis. The substances studied are protonated in one step at the N-atom of the pyridine ring. The protonated cations may be represented, according to the X-ray data, as a resonance of two structures: pyridinium and pyridoniminium; the contribution of the latter probably being considerable. Changes in spectral parameters of POEt groups upon protonation of pyridylimidophosphates (PIP) have been noted.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00699979
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  • 5
    Electronic Resource
    Electronic Resource
    Structural features of the copper(II) chloride-triphenylphosphine-N-(2-pyrimidyl)imine complex in crystal and solution (1992)
    Springer
    Russian chemical bulletin 41 (1992), S. 93-99 
    Details
    ISSN: 1573-9171
    Keywords: Phosphinic complexes ; x-ray analysis ; EPR spectroscopy ; Cu(II) complexes ; crystalline complexes ; dissolved complexes ; triphenylphosphine-N-(2-pyrimidyl)imine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The structure of the copper(II) chloride-triphenylphosphine-N-(2-pyrimidyl)imine complex in crystal and solution was investigated by x-ray analysis and EPR. It was found that despite the difference in the structures of the dissolved and crystalline complexes, the exocyclic nitrogen atom is contained in the coordination sphere of the metal together with the nitrogen atom of the heterocycle in both cases due to the electronic effect of the phosphorus atom. In the crystal, the copper atom is coordinated with two chlorine atoms and two molecules of the ligand, and the distance from the copper cation to the nitrogen atoms of the pyrimidine rings is significantly less than the distance to the nitrogen atoms of the phosphinimine groups (2.0 and 2.8 Å, respectively). The coordination polyhedron formed as a result is a strongly distorted axially asymmetric octahedron. In dissolution, the chlorine anions are substituted by molecules of the solvent, the complex acquires axial symmetry, and four nitrogen atoms from two ligands form a planar square with a copper(II) cation in the center.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00863920
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  • 6
    Electronic Resource
    Electronic Resource
    Crystal and molecular structure of 1:1 molecular complexes of triphenyl-N-(4-methylpyridyl-2)phosphinimine and triphenyl-N-(3-methylpyridyl-2)phosphinimine with perchloric acid (1992)
    Springer
    Russian chemical bulletin 41 (1992), S. 495-499 
    Details
    ISSN: 1573-9171
    Keywords: crystal structure ; molecular complexes ; phosphinimines ; protonation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract X-ray diffraction analysis has been used to determine the crystal structures of the 1:1-composition products of protonation by perchloric acid of isomeric triphenyl-N-(4-methylpyridyl-2)phosphinimine (1) and triphenyl-N-(3-methylpyridyl-2)phosphinimine (2). The structures were refined toR=0.048 andR=0.052, respectively, using 2274 (1) and 2647 (2) reflections. The protonation centers are located at the sites of N atoms of the pyridine ring (1) and the phosphinimino group (2). The distribution of the bond lengths in the cations suggests that a significant contribution is made by a phosphonic structure with positive charges localized on the P atoms. N-H...O hydrogen bonds, with lengths of 2.890(4) and 3.020(3) Å, connect cations and anions in both structures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00863071
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