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  • 1
    Electronic Resource
    Electronic Resource
    The progression of idiopathic Parkinson's disease is not explained by age-related changes. Clinical and pathological comparisons with post-encephalitic parkinsonian syndrome (1987)
    Springer
    Acta neuropathologica 73 (1987), S. 195-201 
    Details
    ISSN: 1432-0533
    Keywords: Post-encephalitic parkinsonian syndrome (PEPS) ; Idiopathic Parkinson's disease (PD) ; Substantia nigra ; Age ; I-Methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary In 12 cases of post-encephalitic parkinsonian syndrome (PEPS) starting at a mean age of 25.1 years, the mean disease duration of 35.8 years was twice as long as in 12 young patients with Lewy body-Parkinson's disease (LB-PD), whose disease started at a mean age of 39.9 years (mean duration 16.5 years). In PEPS the rate of progression of disease was extremely slow. The groups were of a similar age at death, but the post-encephalitic cases had 70% fewer cells in the substantia nigra than in idiopathic Parkinson's disease (PD) and 92% fewer than in controls. Nigra cell destruction was not found in PEPS, but active cell breakdown and abundant extraneuronal melanin were present in PD. A second group of 12 LB-PD cases with mean onset at 58.9 years survived for a mean of 10.1 years, but the number of remaining substantia nigra cells was the same as in the young onset cases of PD. This clinical and pathological evidence does not support the notion that progression of disease in PD can be attributed to the superadded effects of normal ageing on top of a primary acute noxious insult sustained in earlier life.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00693789
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  • 2
    Electronic Resource
    Electronic Resource
    Thermal decomposition of palladium-imidazole complexes (1989)
    Springer
    Journal of thermal analysis and calorimetry 35 (1989), S. 147-152 
    Details
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung In einer Reaktion von PdCl2 mit Imidazol wurde bei einem metall-Ligandenverhältnis von 1∶2 bzw. 1∶4 zwei Pd-Imidazolkomplexe dargestellt. Auf Grund der Ergebnisse von Elementaranalyse und Thermogravimetrieuntersuchungen besitzen die Verbindungen die Formeln Pd(IMDAH)2Cl2·4H2O bzw. Pd(IMDAH)3Cl2 (IMDAH=Imidazol). Der Mechanismus der thermischen Zersetzung dieser Komplexe in Luft umschliesst eine anfängliche Dissoziation (Abgabe von Wasser und IMDAH-Liganden) im Temperaturbereich 120–340 °C, gefolgt von der Bildung von PdO unter Abspaltung der Chloratome bei 530–570 °C sowie die letztendliche Bildung von metallischem Pd bei 820–840 °C.
    Abstract: Резюме Взаимодействием хло ристого палладия и имидазола, взятых в со отношениях 1∶2 и 1∶4, получены имидазоль ные комплексы паллад ия. Элементный анализ и термогравиметричес кие аналитические да нные для этих соединений показали, что они имеют состав Рd(имидазол)2Сl2· 4Н2О и Рd(имидазол)3Сl2. Термическое разложе ние этих комплексов на воздухе сопровожд ается сначала выделе нием воды и имидазола в интервал е температур 120–340°, а затем атомов хло ра и образованием оки си палладия при темпера туре 530–570°. Конечным продуктом р еакции является обра зование металлического палл адия при 820–840°.
    Notes: Abstract Two Pd-imidazole complexes have been synthesized following the reaction of PdCl2 and imidazole at 1∶2 and 1∶4 metal∶ ligand ratios. Elemental and thermogravimetric analytical data obtained from these compounds illustrate that they have the formulae Pd(IMDAH)2Cl2 · 4H2O and Pd(IMDAH)3Cl2 (IMDAH = imidazole), respectively. The mechanism of thermal decomposition for these complexes in air involves initial dissociation of H2O and IMDAH ligands in the 120–340 °C range, subsequent dissociation of the chloride atoms to form PdO in the 530–570 °C range, and finally formation of Pd metal at 820–840 °C.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01914274
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  • 3
    Electronic Resource
    Electronic Resource
    Thermal decomposition of copper-azole complexes (1989)
    Springer
    Journal of thermal analysis and calorimetry 35 (1989), S. 2125-2133 
    Details
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Mittels thermogravimetrischer (TG) Analyse in oxydierender Umgebung wurde die thermische Zersetzung von Komplexen der Formel Cu(IMDAH)xCl2, Cu(BIMDAH)xCl2, mitx=2 oder 4 sowie Cu(BTAH)2Cl2, Cu(5MBTAH)2Cl2, Cu(BIMDA)2, Cu(PDZ)Cl2 und Cu(PYM)Cl2 (IMDAH=Imidazol, BIMDAH=Benzimidazol, BTAH=Benzotriazol, 5MBTAH=5-Methyl-benzotriazol, PDZ=Pyridazin, PYM=Pyrimidin), untersucht. Die TG-Profile aller Komplexe zeigen einen Abbau der Azolliganden und eine Umformung zu Kupferoxiden. Bei den Cu-Azol-Komplexen bleibt während der thermischen Zersetzung ein weitaus größerer Teil des Kupfers im Rückstand enthalten, wohingegen bei den Cu(PDZ)Cl2 und Cu(PYM)Cl2 Komplexen das meiste Cu verdampft. Diese Unterschiede werden auf der Basis der Metall-Ligand-Bindung und mit der Beteiligung von Redoxreaktionen am thermischen Zersetzungsmechanismus erklärt.
    Abstract: Резюме Методом ТГ в окислите льной атмосфере изуч ено термическое разложе ние комплексов общей фор мулы Cu(IMDAH) x Cl2, Сu(BIМDАН) x Сl2 (х=2 или 4), Cu(BTAH)2Cl2, Cu(5MBTAH)2Cl2, Cu(BIMDA)2, Cu(PDZ)Cl2 и Cu(PYM)Cl2, где IMDAH=имидазол, BIMDAH=бензимида зол, ВТАН=бензтриазол, 5МВТАН=5метилбензтриа зол, PDZ=пиридазин, PYM=пиримиди н. Профиль кривых ТГ дл я всех комплексов показал р аспад азоловых лиган дов и образование оксидов меди. Остатки термического разлож ения комплексов медь — азрлы содержат намного бол ьше меди, чем таковые для комплекс ов Cu(PDZ)Cl2 и Cu(PYM)Cl2, при термичес ком разложении которых большинство меди уле тучивается. Эти разли чия интерпретированы на основе связей металл лиганд и участия в процессе т ермического разложе ния окислительно-восста новительных реакций.
    Notes: Abstract The thermal decomposition of complexes of the formulae Cu(IMDAH) x Cl2, Cu(BIMDAH)xCl2 (x=2 or 4), Cu(BTAH)2Cl2, Cu(5MBTAH)2Cl2, Cu(BIMDA)2, Cu(PDZ)Cl2, and Cu(PYM)Cl2 (IMDAH=imidazole, BIMDAH=benzimidazole; BTAH=benzotriazole; 5MBTAH=5-methyl-benzotriazole; PDZ=pyridazine; PYM=pyrimidine) has been studied in an oxidizing environment using thermogravimetric (TG) analysis. The TG profiles of all the complexes indicate degradation of the azole ligands and conversion to copper oxides. The Cu-azole complexes retain much higher fractions of the Cu in the degradation residue than the Cu(PDZ)Cl2 and Cu(PYM)Cl2 complexes which volatilize most of the Cu on thermal decomposition. These differences are interpreted on the basis of metal-ligand bonding and the participation of redox reactions in the thermal decomposition mechanism.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01911877
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  • 4
    Electronic Resource
    Electronic Resource
    2-Heteroatom-1,3-diazole und Chinoxalin als π-Acceptor-Brückenliganden für M(CO)5-Fragmente (M = Cr, Mo, W) Synthese, Elektrochemie, Absorptions- und Emissions-Spektroskopie (1989)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 575 (1989), S. 97-114 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: 2-Heteroatom-1,3-diazoles and Quinoxaline as Bridging π Acceptor Ligands for Metal Fragments M(CO)5 (M = Cr, Mo, W). Synthesis, Electrochemistry, Absorption and Emission SpectroscopyMono- and binuclear complexes of M(CO)5 fragments (M = Cr, Mo, W) with the 2,1,3-benzochalcogenadiazoles (chalcogens: O, S, Se) were synthesized and studied by cyclic voltammetry and by UV/Vis absorption and emission spectroscopy. The complexes exhibit low-lying metal-to-ligand charge transfer (MLCT, d → π*) transitions as evident from long wavelength absorptions and are easily reduced to yield persistent anion radicals. The bis(pentacarbonyltungsten) complexes of the sulfur and selenium ligands show weak near infrared (〉750 nm) emission from rather short lived MLCT excited states. While quinoxaline and monocyclic 2,1,3-thiadiazole also form binuclear W(CO)5 complexes, the related 2-methyl-1,2,3-benzotriazole does not bind W(CO)5 fragments in the neutral state but only as the more basic anion radical as evident from ESR spectroscopy.
    Notes: Ein- und zweikernige Komplexe von M(CO)5-Fragmenten (M = Cr, Mo, W) mit den 2,1,3-Benzochalkogenadiazolen (Chalkogene: O, S, Se) wurden dargestellt und durch Cyclovoltammetrie sowie durch UV/Vis-Absorptions- und Emissions-Spektroskopie untersucht. Die Komplexe weisen aufgrund niedrig liegender Metall-Ligand-Charge-Transfer (MLCT, d → π*)-Übergänge langwellige Absorptionen auf und werden leicht zu beständigen Radikalanionen reduziert. Die Bis(pentacarbonylwolfram)-Komplexe der Schwefel- und Selen-Systeme zeigen schwache Emission im nahen Infrarot (〉750 nm) aus sehr kurzlebigen MLCT-angeregten Zuständen. Während Chinoxalin und monocyclisches 2,1,3-Thiadiazol ebenfalls noch Bis(pentacarbonylwolfram)-Komplexe liefern, koordiniert 2-Methyl-1,2,3-benzotriazol W(CO)5-Fragmente nicht im Neutral-Zustand sondern - wie ESR-Untersuchungen zeigen - erst als basisches Radikalanion.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19895750113
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