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  • Springer Nature  (68)
  • Wiley-Blackwell  (42)
  • 1
    Electronic Resource
    Electronic Resource
    An Inorganic Helix [Mn(IPG)(MeOH)]n[PF6]n[ (1999)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 1999 (1999), S. 2201-2207 
    Details
    ISSN: 1434-1948
    Keywords: Carboxylate syn-anti ; N-centered tripodal ligand ; Manganese ; Imidazole ; Helicoïdal inorganic chiral chain ; Magnetism ; π-π interaction ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The crystal structure of an infinite inorganic chain consisting of MnII and an N-centered tripodal ligand N,N-(2-pyridylmethyl)[(1-methylimidazol-2-yl)-methyl]glycinate is presented. It exhibits a chiral helical structure with a pitch of two monomeric units (each monomeric unit containing one Mn atom). Each manganese is connected to its neighbor through a carboxylate bridge in a syn-anti geometry. Around each manganese center, two carboxylates bind in a cis geometry. This peculiar bridging geometry (syn-anticis) provides a broken-line chain, running in a zig-zag manner along the b axis of the P21 space group. The magnetic properties have been investigated. They show a pseudo-2D magnetic structure, with one major pathway along the chain and an inter-chain minor one. The intrachain coupling is a weak antiferromagnetic interaction (J/k = -0.25). This low value is entirely consistent with the geometry of the bridge. The interchain coupling is a weaker antiferromagnetic coupling (J′/k = -0.11) and could be mediated through π-π interactions between pyridine and imidazole from two adjacent helixes.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Theoretical study of recycling in preparative chromatography (1993)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 39 (1993), S. 809-819 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Using the equilibrium-dispersive model of chromatography, we have investigated recycling as a means to improve the recovery yields and possibly the production rates of chromatographic separations. When compared with the optimal values obtained for the conventional single-cycle regime, our results prove the potential for recycling in preparative chromatography. The analysis performed for the separation of two binary mixtures demonstrates that recycling not only improves the recovery yield but can increase the production rate under certain conditions. Different possibilities of collecting sufficiently separated fractions during recycling are compared. The mathematical model developed can be used effectively for designing optimal recycling strategies in preparative liquid chromatography.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690390509
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  • 3
    Electronic Resource
    Electronic Resource
    Determination of intraparticle transport parameters for multicomponent adsorptionPaper presented by P.S. Carl at the “Jahrestreffen der Verfahrens-Ingenieure”, Stuttgart, October 3 to 5, 1990. (1992)
    Weinheim : Wiley-Blackwell
    Chemical Engineering & Technology - CET 15 (1992), S. 131-137 
    Details
    ISSN: 0930-7516
    Keywords: Chemistry ; Industrial Chemistry and Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: This paper is devoted to the problem of determining intraparticle transport coefficients for multicomponent adsorption from experimental kinetic curves. Due to thermodynamic and kinetic interactions between the mixture's components, this task is more difficult than for single component systems. As an example, the kinetics of adsorption on activated carbon of binary mixtures of phenol and indole from aqueous solutions was studied in a continuous stirred tank adsorber (CSTA). To describe the intraparticle transport of this system, the surface diffusion model using a linear driving force (LDF) was applied. For determining the matrix of the unknown kinetic parameters of the LDF-model, the application of three independent mathematical methods is discussed. Firstly, a semi-analytical calculation (SA) of the intraparticle transport parameters by solving a system of linear equations on the basis of an empirical description of experimental kinetic curves is put forward. Secondly, a non-linear regression (NR) method for parameter estimation was applied. The third method is a non-linear regression which, in contrast to the SA and NR methods, guarantees the stability of the system of differential equations in the steady state of the process (NRS).
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ceat.270150210
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  • 4
    Electronic Resource
    Electronic Resource
    Über aktives Eisen X. Mitteilung. Über die magnetische Charakterisierung des Ferrimonodipyridylkomplexes und den Magnetismus einiger komplexer Ferropentacyanide (1937)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 230 (1937), S. 225-238 
    Details
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19372300306
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  • 5
    Electronic Resource
    Electronic Resource
    Beiträge zur Kenntnis der Konstitutionen der Säuren der Elemente der 5. Gruppe des periodischen Systems und ihrer Salze. II. Mitteilung. Über die Säuren des Arsens (1937)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 232 (1937), S. 169-178 
    Details
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19372320207
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  • 6
    Electronic Resource
    Electronic Resource
    Cellulose-based polymer blend filaments spun from N-methylmorpholine-N-oxide (1996)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 243 (1996), S. 129-142 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Es wurden Cellulosefilamente, die bis zu 15 Gew.-% eines aromatischen Polyamides [Poly(2,6-dichlor-1,4-phenylenterephthalamid) (P26C1PTA)] als Additiv enthalten, aus gemeinsamen Lösungen der Cellulose und des P26C1PTA in N-Methylmorpholin-N-oxid ersponnen und deren textil-physikalischen Eigenschaften bestimmt. Bei einem P26C1PTA-Gehalt von 〈10 Gew.-% weisen die meisten der untersuchten Eigenschaften keine signifikanten Änderungen im Vergleich zu reinen Cellulosefilamenten auf. Die Naßscheuerbeständigkeit der Filamente, die ca. 10 Gew.-% P26C1PTA enthalten, ist jedoch deutlich erhöht. Bei einem P26C1PTA-Gehalt von mehr als 10 Gew.-% sinken die, Festigkeiten und die Naßscheuerbeständigkeit der Filamente merklich, was auf eine erhöhte Fìbrillierung zurückzuführen ist.
    Notes: The influence of a small addition (〈15 wt.-%) of an aromatic polyamide [poly(2,6-dichloro-1,4-phenylene terephthalamide) (P26C1PTA)] as additive on the textile-physical properties of cellulose filaments was investigated. The blend filaments were spun from homogeneous blend solutions prepared in the common solvent N-methylmorpholine-N-oxide. Most of the estimated properties of blend filaments containing not more than 10 wt.-% of P26C1PTA do not differ significantly from those of pure cellulose filaments. However, the wet abrasion resistance attains a maximum at a P26C1PTA content of 10 wt.-%. At higher P26C1PTA content the fibrillation tendency of the blend filaments is increased. Coincidentally, a decrease of tenacity and wet abrasion resistance was obtained.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1996.052430111
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  • 7
    Electronic Resource
    Electronic Resource
    Darstellung cyclischer Nitrone aus heterocyclischen N-(Benzyloxy)aminen (1982)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 115 (1982), S. 2679-2681 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Preparation of Cyclic Nitrones from Heterocyclic N-(Benzyloxy)aminesTreatment of heterocyclic N-(benzyloxy)amines 1 with concentrated hydrogen peroxide solution in acetic acid enables the preparation of 7-membered cyclic nitrones in respectable yields. This one-pot procedure offers some advantages compared with conventional routes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19821150732
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  • 8
    Electronic Resource
    Electronic Resource
    Konduktometrische und UV-spektroskopische Charakterisierung von Polystyryllithium mit Methacrylnitril- und 2-Vinylpyridin-Endgruppen (1987)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 38 (1987), S. 229-233 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Polystyryl lithium chains PStMnLi have been synthesized, where Mn is a small number of 2-vinyl pyridine or metharylonitrile end groups. These agents were investigated by UV spectroscopy and conductometry. The constants of electrolytic dissociation have been estimated. The same parameters have been determined with the alkoxy forms of the chains, which were formed by action of dimethyl formamide.
    Notes: Es wurden Lithiumpolystrylketten PStMnLi synthetisiert, wo Mn eine kleine Anzahl von 2-Vinylpyridin- oder Methacrylinitrilendgruppen ist. Diese Agenzien wurden UV-spektroskopisch und konduktometrisch untersucht. Die Konstanten der elektrolytischen Dissoziation wurden abgeschätzt. Dieselben Parameter wurden an den Alkoxiformen dieser Ketten untersucht, die sich unter der Einwirkung von Dimethylformamid bilden.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1987.010380406
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  • 9
    Electronic Resource
    Electronic Resource
    Untersuchungen zur anionischen Copolymerisation von Acrylnitril mit Acrylaten und Methylmethacrylat in DimethylformamidHerrn Professor Dr. Dr. h. c. Hermann Klare zum 75. Geburtstag gewidmet (1984)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 35 (1984), S. 364-368 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: The anionic copolymerization of acrylonitrile with acrylates and methylmethacrylate initiated by lithium-tert-butoxide in dimethylformamide was investigated in the temperature range of -30 to +10°C. Based on the way of incorporation of the esters, the chemical inhomogeneity and the structure of the copolymers, the copolymerization parameters calculated by the model of Mayo and Lewis were examined with respect to their validity for this anionic process.
    Notes: Die anionische copolymerisation von Acrylnitril mit Acrylaten und Methylmethacrylat, initiiert durch Lithium-tertbutoxid in Dimethylformamid, wurde im Temperaturbereich -30°C und +10°C untersucht. Aus dem Einbauverhalten der Ester, der chemischen Uneinheitlichkeit und der Struktur der Copolymerisate werden die nach dem Modell von Mayo und Lewis berechneten Copolymerisationsparameter hinsichtlich ihrer Gültigkeit für diesen anionischen Prozeß überprüft.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1984.010350505
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  • 10
    Electronic Resource
    Electronic Resource
    Synthese und charakterisierung der in anionischen systemen hergestellten polaren hybridmakromoleküle (1992)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 43 (1992), S. 38-46 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Synthesis and characterization of graft and block copolymers prepared of polar monomers are described. Activation of P2VP-, P4VP-, PVAC-, and PMMA-chains is necessary for subsequent addition of monomers. The reactions taking place are discussed in more detail. Well defined synthesis of block copolymers is achieved, if the short living time of AN chains is used for the addition of the monomers. The investigation of chemical heterogeneity of these copolymers is difficult.
    Notes: Pfropf- und Copolymere aus polaren Monomeren werden hinsichtlich ihrer Synthese und Charakterisierung näher beschrieben. Im Falle der Pfropfcopolymere sind aktivierte P2VP-, P4VP, PVAC- und PMMA-Ketten die Voraussetzung für die Monomeraddition. Dabei ablaufende mögliche Reaktionen werden diskutiert. Gut definierte Blockcopolymere sind zugänglich, wenn die kurze Lebensdauer der AN-Ketten für die weitere Monomeranlagerung ausgenutzt wird. Die Untersuchung der chemischen Uneinheitlichkeit derartiger Systeme ist kompliziert.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1992.010430109
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