ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Preparation and optical properties of single crystal thin films of bismuth substituted iron garnets for magneto-optic applications (1973)
    Springer
    Applied physics 2 (1973), S. 219-228 
    Details
    ISSN: 1432-0630
    Keywords: Magneto-optics ; Bi garnets ; Liquid phase epitaxy ; Crystal growth
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Single crystal thin films of Bi substituted iron garnets have been grown by the liquid phase epitaxy technique. The growth conditions and compositions are presented together with the segregation coefficients of Bi and Pb as a function of growth temperature. The Faraday rotation and optical absorption have been measured for wavelengths between 0.7 and 0.46 μm. The superior magneto-optic properties (Faraday rotations of up to ten times larger than that observed for Y3Fe5O12) make these epitaxial layers attractive for magneto-optic devices. The influence of Pb incorporation on the optical properties of the films is discussed. Compositions of Bi and Ga(Al) substituted Gd3Fe5O12, which exhibit a magnetic compensation temperature near room temperature and high Faraday rotation, have also been prepared. The magnetic switching behaviour as a function of temperature has been determined. It shows that these films are especially suited for thermomagnetic recording using an argon ion laser at a wavelength of 5145 Å.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00889503
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Notiz über ein einfaches Verfahren zur Darstellung von 3,4-Bismethylencyclobuten (1973)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 106 (1973), S. 3461-3462 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19731061031
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    A calorimetric study of a polymer-monomer complex formed by polyuridylic acid 3′,5′-cyclic AMP (1973)
    New York : Wiley-Blackwell
    Biopolymers 12 (1973), S. 373-385 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The existence of a soluble complex formed by polyuridylic acid (poly (U)) and 3′,5′-cyclic AMP (cAMP) is demonstrated by u.v. extinction vs. temperature curves, optical rotation, equilibrium dialysis, and reaction calorimetry. The complex hasthe stoichiometry of 2 poly (U)-cAMP and its formation is accompanied by an enthalpy change of -13.0 kcal/mole of base triplet. The introuction of an empirical factor α in the equations given by Damle2 and Crothers2 leads to the evolution of a ΔH value of -13.4 keal/mole. The parameter α is considered as a correction factor for the concentration dependence of the binding process. There is no relation between α and the reduction of monomer activity due to self-association of monomers. The study of the binding process at several temperatures showed that the cooperativity parameter, σ, is independent of temperature and its value of 6.5 × 10-3 is in good agreement with σ = 5 × 10-3 for the poly (U)·poly(A) system.3
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1973.360120214
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Synthese von Haschisch-Inhaltsstoffen. 6. Mitteilung5. Mitt. s. [1]. (1973)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 56 (1973), S. 519-524 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The synthesis of a new (-)-Δ8-6a,10a-trans-tetrahydrocannabinol analogue, containing a N-methyl-3-propyl-pyrrolidin-3-yl side-chain, is reported.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19730560149
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Neuartige Cycloadditionsreaktionen von 2- und 4-Vinylpyridin mit N-Alkyl-maleinimiden (1973)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 56 (1973), S. 440-449 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 4-Vinylpyridine (1a) combines with 3 moles of dienophilic N-alkyl-maleinimides (2) in the presence of polymerization inhibitors. The first step of the reaction probably consists of 1:1-addition with participation of an aromatic double bond, comparable to the analogous behavior of styrene and its derivatives under similar conditions. The unstable intermediates 3, like other Schiff bases (imines), add 2 further moles of the N-alkyl-maleinimides forming the spiro compounds 4. These are split in an acidic medium into the N-alkyl-5,6,7,8-tetrahydroisoquinoline-7,8-dicarboximides (5), and N,N′-dialkyl-2-butene-1,2,3,4-tetracarboxylic 1,2,:3,4-diimides (6). LiAlH4 reduction of these two types of compounds leads to N-alkyl-1 H-(3,4-d)-pyrrolo-2,3,3a,4,5,9b-hexahydroisoquinolines (7) and to N,N′dialkyl-3,3′-bipyrrolidyls (8A) and their dehydro-products 8B, respectively.From the reaction of 2-vinylpyridine (1b) with N-alkyl-maleinimides (2) the 1:2-addition products 9 can be isolated in the presence of polymerization inhibitors, which are derivatives of N-alkyl-5,6,7,8-tetrahydroquinoline-5,6-dicarboximides (9). This again corresponds to the reaction type of cycloadditions with styrene. Furthermore 1:3 adducts are formed which according to 1H- and 13C-NMR.-data most likely have the structure 10, representing a new type of cycloaddition involving the pyridine nitrogen.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19730560134
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Imidazole als Induktoren der Cyclo-Oligomerisation von N-Alkyl-maleinimiden und der cis-trans, Umlagerung von Maleinsäure-dimethylester (1973)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 56 (1973), S. 1406-1413 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: N-Methylimidazole (N-M), in boiling acetonitrile, catalyzes the oligomerization of N-alkyl maleimides (2) to tri-, tetra-, penta- and hexamers. In the presence of small amounts of hydroquinone the trimers of 2 are formed, which have the structure of N,N′,N″-trialkyl-cyclohexane-1,2,3,4,5,6-hexacarboxy-1,2:3,4:5,6-tri-midies (6). A possible mechanism of this catalytic cyclo-oligometization is discussed. Dependant from the chemical nature of the N-alkyl substituent of the maleimides, imidazole or benzimidazole and some of its C-substituted products also can function as oligomerization catalysts. However in this case the normal 1:1 addition is the main reaction, as observed also with pyrazoles plus 2. Maleic dimethylester was isomerized to fumaric dimethylester in the presence of N-methylimidazol. These observations reveal additional catalytic functions to the well known hydrolysis catalyzing properties of imidazoles.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19730560424
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    On the positional interchange of the phenyl- and hydroxyl groups in the [C9H11O]+-ion, generated from 2-methyl-2-phenylpropane-1,3-diol (C10H14O2) upon electron-impact (1973)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 7 (1973), S. 37-43 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: It is shown by deuterium-labelling experiments, that a substantial part of the [M - CH2OH]+-ions from 2-methyl-2-phenyl-propane-1,3-diol must have rearranged to carbonyl-oxygen protonated phenylacetone by a positional interchange of the phenyl- and hydroxyl groups prior to decomposition.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210070107
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Relationship between V4+ and Mo6+ Contents in V2O5 doped with MoO3 (1973)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 399 (1973), S. 170-174 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenhang zwischen der V4+ und Mo6+-Konzentration in mit MoO3 dotiertem V2O5Der V4+-Gehalt von mit MoO3 dotiertem V2O5 wird durch spektrophotometrische Messung bestimmt. Der Einfluß des Sauerstoffdruckes wird untersucht. Bis zu ungefähr 3,5 At.-% Mo/(Mo+V) ist der V4+-Gehalt gleich dem Mo6+-Gehalt für an der Luft gesinterte Proben. Bei Zunahme des Sauerstoffdrucks erfolgt eine Abnahme des V4+-Gehalts für die mit 5, 10 und 33 At.-% Mo dotierten Proben.
    Notes: The V4+ content in V2O5 doped with MoO3 is measured by a spectroscopic method. The influence of the oxygen pressure is also considered. Up to roughly 3.5 at.-% Mo/(Mo+V) the V4+ fraction is equal to the Mo6+ fraction for samples sintered in air. Increase of PO2 gives a decrease in the measured values of the V4+ fraction for the 5, 10 and 33 at.-% Mo-doped samples.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19733990205
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Fluoraustauschreaktionen an Metalltrifluorphosphin-Komplexen. IV. Zur Kenntnis der Reaktionen von Nitrosyl-trifluorphosphin-Komplexen von Eisen und Kobalt mit Alkoholat- und Hydroxid-Ionen (1973)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 402 (1973), S. 16-28 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Fluorine Exchange in Trifltiorophosphinemetal Complexes. IVThe Reaction of Nitrosyltrifluorophosphirie Complexes of Iron and Cobalt with Alkoxid- and Hydroxid-IonsFe(NO)2(PF3)2, 1, and Co(NO)(PF3)3, 2, react with alcoxids and phenoxid by a complete F/OR-exchange to the corresponding phosphite complexes Fe(NO)2P(OR)3)2 and Co(NO)(P(OR)3)3, (R = CH3, C2H5, n-C3H7, i-C3H7, n-C4H9, C6H5), 3-13. The nitrosyltrifluorophosphine complexes 1 and 2 change only one or two fluorine atoms against OH--ions to give difluorophosphito complexes: The reaction of 1 with a diisopropylamine/water mixture yields the bis(difluorophosphito) complex [Fe(NO)2(PF2O)2]2-, 15, with 2 under identical conditions [Co(NO)(PF3)2 PF2O]-, 14, is obtained; 1 and 2 react with Ba(OH)2 in THF to give [Fe(NO)2(PF3)PF2O]- resp. 14, the latter reacts under harder conditions partially to [Co(NO)(PF3)(PF2O)2]2-. These difluorophosphito complexes, which are isolated as salts with the cations [(i-C3H7)2NH2]+ and Ba2+, can be alkylated to the corresponding difluorethoxyphosphine derivates of 1 and 2, Fe(NO)2 (PF3)2-n(PF2OC2H5)n (n = 1,2) and Co(NO)(PF3)2PF2OC2H5. All compounds are characterised by IR and mass spectra.
    Notes: Fe(NO)2(PF3)2, 1, und Co(NO)(PF3)3, 2, tauschen bei der Umsetzung mit Alkoholaten und Phenolat sämtliche Fluoratome gegen RO-Gruppen aus unter Bildung der entsprechenden Phosphitkomplexe Fe(NO)2(P(OR)3)2 bzw. Co(NO)(P(OR)3)3 (R = CH3, C2H5, n-C3H7, i-C3H7, n-C4H9, C6H5), 3-13. Beide Nitrosyl-trifluorphosphin-Komplexe gehen maximal nur einen zweifachen F/OH-Austausch zu Difluorphosphito-Komplexen ein: In einem Diisopropylamin/Wasser-Gemisch liefert 1 den Bis(difluorphosphito)-Komplex[Fe(NO)2(PF2O)2] 2-, 15, 2 unter gleichen Bedingungen [Co(NO)(PF3)2PF2O- 14; die Umsetzung von 1 und 2 mit Ba(OH)2 in Tetrahydrofuran führt zu [Fe(NO)2(PF3) PF2O]- bzw. 14, welches sich unter drastischen Bedingungen teilweise zu [Co(NO)(PF3) (PF2O)2]2- umsetzt. Diese Difluorphosphito-Komplexe, die als Salze mit den Kationen [(i-C3H7)2NH2]+ bzw. Ba2+ anfallen, können zu den entsprechenden Difluoräthoxy-Derivaten von 1 und 2, Fe(NO)2 (PF3)2-n(PF2OC2H5)n (n = 1, 2) bzw. Co(NO)(PF3)2PF2OC2H5, alkyliert werden. Sämtliche Verbindungen werden anhand der IR- und Massenspektren charakterisiert.
    Additional Material: 8 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19734020103
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Spinelle mit substituierten Nichtmetallteilgittern. IVMitteilung III: J. Solid State Chem. 3, 67 (1971).. Rötgenographische Untersuchung der Systeme CuCr2(S1-xSex)4 und CuCr2(Se1-xTex)4 (1973)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 399 (1973), S. 219-224 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Spinels with substituted Nonmetal Sublattices. IV. CuCr2(S1-xSex)4 and CuCr2(Se1-xTex)4Polycrystalline samples of the spinel system CuCr2(S1-xSex)4 have been prepared with 0 ≤ x ≤ 1. We found that in the spinel system CuCr2(Se1-xTex)4 no solid solution is existent in the range 0.01 ≤ x ≤ 0.70. When S is substituted by Se and Se by Te the lattice constants increase linearely by 0.52 Å and 0.81 Å respectively. The anion-sublattice shows random distribution of the chalcogen atoms, the chalcogen parameters u are constant in the system CuCr2(S1-xSex)4 with a mean value of u = 0.3829. The calculated anion-cation-distances lead to a covalent tetrahedral radius rCu = 1.23 Å. This radius is in agreement with the radius rCu = 1.22 Å of Cu spinels with Cu in the valence +1.
    Notes: Im Spinellsystem CuCr2(S1-xSex)4 erfolgt im Bereich 0 ≤ x ≤ 1 lückenlose Mischkristallbildung, während beim Spinellsystem CuCr2(Se1-xTex)4 in diesem Bereich zwischen 0,01 ≤ x ≤ 0,70 eine Mischungslücke auftritt. Beim Ersatz von S durch Se wächst die Gitterkonstante a linear um 0,52 Å, beim Ersatz von Se durch Te linear um 0,81 Å. Das Anionenteilgitter ist statistisch mit Chalkogenatomen besetzt. Die Chalkogenparameter im System CuCr2(S1-xSex)4 sind konstant, der Mittelwert beträgt u = 0,3829. Aus den berechneten Anionen-Kationen-Abständen erhält man einen kovalenten Tetraederradius rCu = 1,23 Å. Dieser Radius stimmt mit dem Radius rCu = 1,22 Å überein, den man aus Cu-Spinellen mit Cu in der Oxydationsstufe +1 erhält.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19733990212
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...