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  • 1
    Electronic Resource
    Electronic Resource
    Variable-Temperature EPR and Transport Studies on Poly(4,4'-methylenedianiline): Evidence for Bipolarons (1995)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 99 (1995), S. 10324-10328 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100025a039
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  • 2
    Electronic Resource
    Electronic Resource
    Theoretical study of the ground-state vibrations of nonionized glycine (1992)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 96 (1992), S. 10735-10739 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100205a029
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  • 3
    Electronic Resource
    Electronic Resource
    Dynamic Behavior of Poly(2-vinylpyridine) in Solution Studied by 13C Nuclear Magnetic Relaxation (1995)
    s.l. : American Chemical Society
    Macromolecules 28 (1995), S. 2396-2405 
    Details
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ma00111a038
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  • 4
    Electronic Resource
    Electronic Resource
    Conformational analysis and electronic structure of monothiodiacetamide: Normal coordinate analysis and molecular orbital study (1980)
    Springer
    Monatshefte für Chemie 111 (1980), S. 1335-1341 
    Details
    ISSN: 1434-4475
    Keywords: CNDO/2 ; Conformation ; Electronic structure ; Normal vibrations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Das Infrarotspektrum von Monothiodiacetamid (MTDA, CH3CONHCSCH3) und der entsprechenden N-deuterierten Derivate wurde in Lösung, im Festzustand und bei tiefer Temperatur gemessen. Die Normalkoordinatenanalyse der möglichen planaren Konformeren wurde mittels einer einfachenUrey-Bradley-Funktion durchgeführt. Die dabei abgeleitete Konformation vonMTDA steht im Einklang mit einer semiempirischen quantenchemischen Rechnung (CNDO/2). Die Zuordnung der Schwingungen und die Elektronendichteverteilung inMTDA werden angegeben.
    Notes: Abstract The infrared spectra of monothiodiacetamide (MTDA, CH3CONHCSCH3) and its N-deuterated compound in solution, solid state and at low temperature are measured. Normal coordinate analysis for the planar vibrations ofMTDA-d 0 and −d 1 have been performed for the two most probablecis-trans-CONHCS-or-CSNHCO-conformers using a simpleUrey-Bradley force function. The conformation ofMTDA derived from the vibrational spectra is supported by the all valence CNDO/2 molecular orbital method. The vibrational assignments and the electronic structure ofMTDA are also given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00903660
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  • 5
    Electronic Resource
    Electronic Resource
    Spectral, thermal, and electrical properties of poly(o- and m-toluidine)-polystyrene blends prepared by emulsion pathway (1998)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 36 (1998), S. 2291-2299 
    Details
    ISSN: 0887-624X
    Keywords: poly(o-toluidine) ; (POT) ; poly(m-toluidine) ; (PMT) ; polystyrene (PSt) ; blends ; emulsion pathway ; spectroscopy ; thermal stability ; conductivity ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Conducting poly(o-toluidine) (POT) and poly(m-toluidine) (PMT) blends containing 10, 30, 50, 70, and 90 % wt/wt of polystyrene (PSt) were prepared by employing a two-step emulsion pathway. The bands characteristic of both polystyrene and POT/PMT are present in the IR spectra of POT-PSt and PMT-PSt blends. The UV-visible spectra of POT-PSt and PMT-PSt blends exhibit two bands around 313 and 610 nm, confirming that some amount of POT/PMT base is present in the blends. The EPR parameters such as line width and spin concentration reveal the presence of POT/PMT salt in the respective blends. The TGA, DTA, and DSC results suggest a higher thermal stability for the POT and PMT blends than that for the respective salts. The conductivity values of POT(70)-PSt(30) and POT(90)-PSt(10) blends are almost the same (1.1 × 10-2 and 1.3 × 10-2 S cm-1, respectively) and these values are very close to that of pure POT salt, suggesting that POT can be blended with up to 30% wt/wt of PSt to improve its mechanical properties without a significant drop in its conductivity. The conductivity values of PMT-PSt blends are lower than those of the corresponding POT-PSt blends by two to three orders of magnitude, indicating that POT is a better system than PMT to prepare blends by this method. The dielectric constant and tan δ values of the blends increase with the amount POT/PMT and are greater than that of polystyrene. © 1998 John Wiley & Sons, Inc. J. Polym. Sci. A Polym. Chem. 36: 2291-2299, 1998
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    1H and 13C nuclear magnetic resonance study of 1,3-dipyridylthioureas for chemical shift assignments and conformational analysis (1987)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 25 (1987), S. 474-479 
    Details
    ISSN: 0749-1581
    Keywords: 1H NMR ; 13C NMR ; 1,3-Dipyridylthioureas ; Conformation ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A study of molecular conformation by 1H and 13C NMR methods of three 1,3-dipyridyl thioureas namely, 1,3-di(2-pyridyl)thiourea (1), 1,3-di(3-pyridyl)thiourea (2), 1-(2-pyridyl)-3-(3-pyridyl)thiourea (3), and also of 1-phenyl-3-(2-pyridyl)thiourea (4) and 1,3-diphenylthiourea (5), included for the sake of comparison, was carried out. Evidence was obtained that 3 and 4 exist in solution solely in one form, in an internally hydrogen bonded E,Z conformation, whereas 1, 2 and 5 exist in two (or more) rotamer forms. The data reveal an interesting dynamic exchange phenomenon occurring in 1 between two intramolecularly hydrogen bonded conformers. The 1H and 13C chemical shifts, 1H,1H and 13C,1H coupling constants are reported. The 13C and 1H chemical shifts are correlated with the electron densities calculated by the CNDO method.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1260250603
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  • 7
    Electronic Resource
    Electronic Resource
    13C and 1H NMR study of N-5′-methylsalicylideneanilines (1987)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 25 (1987), S. 471-473 
    Details
    ISSN: 0749-1581
    Keywords: 13C and 1H NMR ; N-5′-methylsalicylideneanilines ; σ F and R ; σ and R0 ; Conformation ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The 13C and 1H NMR spectra of six N-5′ -methylsalicylideneanilines have been studied. Correlations of the chemical shifts of C-α (azomethine carbon) and C-4′ with the σ, F, R, σ1 and σR0 parameters have been examined for N-5′-methylsalicylideneanilines, and also for N-benzylideneanilines and N-salicylideneanilines. The results suggest that the first compounds have a nearly planar conformation whereas the second and third type of derivatives have a twisted conformation.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1260250602
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  • 8
    Electronic Resource
    Electronic Resource
    Infrared and electronic Spectral Studies of Metal Maleato Complexes (1971)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 385 (1971), S. 329-336 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Es wurden die IR-Spektren von Maleinsäure, Na- und K-Maleat sowie der Maleatokomplexe M(mal) · xH2O und H2[M(mal)2] · 4H2O mit den zweiwertigen Metallen M = Co, Ni, Cu, Zn untersucht und vollständig gedeutet. Aus den Carbonyl-frequenzen folgt ein geringerer Kovalenzanteil der M-O-Bindung als bei analogen Oxalatound Malonatokomplexen. Um über die Struktur der Maleatokomplexe Auskunft zu erhalten, wurden auch die Elektronenspektren aufgenommen.
    Notes: Infrared spectra of maleic acid, its sodium and potassium salts, and its metal complexes of the formula M(mal) · xH2O and H2[M(mal)2] · 4 H2O, where M = divalent Co, Ni, Cu or Zn, have been studied. An assignment of all the infrared frequencies have been made by a comparison with related molecules. The carbonyl frequencies indicate less “covalent character” in metal-oxygen bond than in the related oxalate and malonate complexes. The electronic spectra have been recorded and used to obtain the structure of the complexes.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19713850316
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  • 9
    Electronic Resource
    Electronic Resource
    Studies on the Hydroxide and Peroxide of Niobium (1967)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 353 (1967), S. 103-108 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Das bei Zimmertemperatur unbeständige Niobperoxidhydrat Nb2O7 · 4 H2O mit Nb:O22- = 1:1 wird dargestellt. Aus DTA-Versuchen und dem IR-Spektrum wird durch Vergleich mit Nioboxidhydrat auf einen polymeren Aufbau mit koordinierten Peroxid-(NbO2-Dreiring), H2O- und OH-Gruppen geschlossen.
    Notes: Hydrated niobium peroxide, Nb2O7 · 4 H2O having niobium: peroxy oxygen as 1:1, is prepared. The peroxy oxygen is lost at room temperature slowly and continuously. The differential thermal analysis gives an exothermic peak at 190°C due to the disruption of the peroxy group. The infrared spectrum of the peroxide indicates polymeric nature of niobium peroxide and coordinated peroxide, water and hydroxyl groups. A triangular ring structure is suggested for the peroxy niobium group. Niobium hydroxide has also been studied under similar conditions to serve as a reference.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19673530114
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  • 10
    Electronic Resource
    Electronic Resource
    Mixed Ligand Complexes of Oxovanadium (IV) Oxalate (1972)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 387 (1972), S. 373-376 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Es wurden die Oxovanadin(IV)-Komplexe VOC2O4 · 2 L (L = DMF, Formamid, Äthylenharnstoff, Harnstoff, Äthylendiamin) hergestellt und charakterisiert. In ihnen ist die Oxalatgruppe zweizähnig, ebenso das Äthylendiamin (über seinen Stickstoff), während die anderen Liganden L über den Carbonylsauerstoff einzähnig koordinieren. Das Vanadin befindet sich in all diesen Komplexen in einer verzerrten tetragonal-pyramidalen Fünferkoordinaten.Geschlossen wird dies aus magnetischen Messungen sowie Elektronen und IR-Spektren.
    Notes: The oxovanadium(IV) complexes VOC2O4 · 2DMF, VOC2O4 · 2 formamide, VOC2O4 · 2 ethylene urea, VOC2O4 · 2 urea and VOC2O4 · en have been prepared and characterized. The oxalato group functions as a bidentate ligand in all these complexes. Except ethylene diamine the remaining ligands - DMF. formamide, ethylene urea and urea - act as monodentate ligand coordinating through their carbonyl oxygen. Ethylene diamine is bound to the metal through nitrogen. In all the complexes vanadium is five coordinated in distorted tetragonal-pyramidal structures.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19723870311
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