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  • 1
    Electronic Resource
    Electronic Resource
    Untersuchungen an Tetranatrium-cyclo-tetraphosphat(V) und seinen Hydraten (1983)
    Springer
    Monatshefte für Chemie 114 (1983), S. 699-709 
    Details
    ISSN: 1434-4475
    Keywords: Anhydrous sodium-cyclo-tetraphosphate(V) ; Crystal-structure ; Sodium-cyclo-tetraphosphate(V)-monohydrate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A reinvestigation of the system (NaPo3)4/H2O has been carried out. Besides the already known tetra-hydrate and anhydrous form, a mono-hydrate in the temperature range 100–120°C exists. Single crystals were obtained by crystallization from aqueous solutions containing higher alcohols (e.g. ethyleneglycol) at ∼115°C. The crystal structure was solved by X-ray methods (orthorhombic;P212121;a=1365.4(2),b=1 347.5(3),c=629.1(3)pm;Z=4; 2774 diffractometer data;R=0.053). The cyclic anions exhibit point symmetryD 2d with all terminal oxygens in eclipsed conformation. With respect to the (NaPO3)4-part of structure, mono-hydrate and anhydrous forms are isostructural; lattice parameters of the latter area=1 380.8(2),b=1 363.3(2),c=602.7(2) pm. The transition mono-hydrate to anhydrous form occurs topochemically and is reversible.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01134183
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  • 2
    Electronic Resource
    Electronic Resource
    Zur Kenntnis von Cr2H2(As2O7)(As4O12) (1980)
    Springer
    Monatshefte für Chemie 111 (1980), S. 377-384 
    Details
    ISSN: 1434-4475
    Keywords: Crystal structure of Cr2H2(As2O7)(As4O12) ; Cyclo-tetraarsenate(V)-ion ; Diarsenate(V)-ion ; Magnetic susceptibility
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The crystal structure of Cr2H2(As2O7)(As4O12) has been determined by X-ray methods using single crystal diffractometer data (1,152 reflections,R=0.054, orthorhombic,Pmmn,a=1317.7 (7),b=1124.9 (6),c=494.3 (4) pm,Z=2). The crystal structure contains both diarsenate(V) and the hitherto unknown cyclo-tetraarsenate(V)-anions. The magnetic susceptibility follows theCurie-Weiss law (μ=3.86±0.01 μB/Cr3+, Θ=−31 K).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00903233
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  • 3
    Electronic Resource
    Electronic Resource
    Kristallstruktur und thermisches Verhalten von Tetrakaliumcyclo-tetraphosphat(V)-Dihydrat, (KPO3)4·2H2O (1985)
    Springer
    Monatshefte für Chemie 116 (1985), S. 203-210 
    Details
    ISSN: 1434-4475
    Keywords: Potassium-cyclo-tetraphosphate(V)-dihydrate ; Crystal structure ; Dehydration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The crystal structure of (KPO3)4 · 2H2O was solved by direct methods andFourier-syntheses (triclinic; P $$\bar 1$$ ;a=1 114.9 (2),b=821.9 (2),c=815.7 (3) pm; α=88,88 (2), β=84.51 (2), γ=82.70 (2)°;Z=2; 5910 unique reflections;R=0.052). The cyclic anions exhibit point symmetry S4 with four terminal oxygens in axial and four in equatorial position. Thermal investigations (DTA, TGA, X-Ray-methods) show that the dehydration occurs in two steps. The anhydrous form of (KPO3)4 is stable above 230 °C and undergoes a second order phase transition which is complete at 515±5 °C.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00798455
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  • 4
    Electronic Resource
    Electronic Resource
    Crystal and molecular structure of the cycloaddition product between maleic anhydride, cyclopentadiene, and 1,2-bis(dibromomethyl)benzene as DMF solvate (1∶2) (1993)
    Springer
    Journal of chemical crystallography 23 (1993), S. 55-60 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Crystal structure determination reveals that the unknown cycloaddition product between maleic anhydride, cyclopentadiene, and 1,2-bis(dibromomethyl)benzene has a nona-cyclic centrosymmetric structure. The compound was studied as DMF solvate (1∶2). There is no significant intermolecular interaction between the title molecule and the DMF. Packing is in layers for both molecular species. A possible mechanism of formation of the title compound is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01161288
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  • 5
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    Hydraulic redistribution by hybrid poplars (Populus nigra x Populus maximowiczii) in a greenhouse soil column experiment (2021)
    Springer
    Details
    Publication Date: 2021-03-09
    Description: Aims Hydraulic redistribution (HR) enhances water resources for neighboring crops in silvopastoral agroforestry (AF). Here, we tested whether and to what extent water stressed shallow-rooted neighboring plants benefit from water redistributed by deep-rooted poplar plants. Methods We conducted trace experiments with deuterated water (2H2O) in greenhouse soil column experiments. We measured hydraulic lift (HL) by poplars grown at two levels of soil drying and estimated the amount of hydraulically lifted water. In a parallel experiment we grew poplars and barley (Hordeum vulgare) in two columns connected via a small cross-rooting segment. Results Soil moisture measurements and stable isotope signatures of soil and xylem water proved the occurrence of HL in poplar. Additionally, stable isotopes proved the transport of water from deep roots of poplars to shallow roots of barley. Conclusions In conclusion, the experiments showed that poplars are capable to redistribute water during drought spells and that this water can facilitate plant growth of shallow-rooted crops. This result implies evidence for an enhanced soil water supply of plants in agroforest systems under drought conditions.
    Print ISSN: 0032-079X
    Electronic ISSN: 1573-5036
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Published by Springer
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