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  • Articles  (11)
  • Inorganic Chemistry  (10)
  • Structure  (1)
  • 1985-1989  (3)
  • 1980-1984  (6)
  • 1975-1979  (2)
  • 1960-1964
  • 1955-1959
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  • Articles  (11)
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  • 1985-1989  (3)
  • 1980-1984  (6)
  • 1975-1979  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Phytomass structure of natural plant communities on spodosols in southern Venezuela: the Bana woodland (1985)
    Springer
    Plant ecology 63 (1985), S. 13-34 
    Details
    ISSN: 1573-5052
    Keywords: Bana ; Leaves ; Phytomass ; Root/shoot ratio ; Spodosol ; Structure ; Tropical forest ; Wetland
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Bana, or Low Amazon Caatinga is an evergreen sclerophyllous woodland. It occurs on bleached quartz sands in the lowlands of SW Venezuela, where it occupies relatively small ‘islands’ amidst Tall Amazon Caatinga which is exclusively developed on tropaquods. There is an outer vegetation belt about 20 m in width in which trees over 10 m in height occur (Tall Bana); its structure and floristic composition resemble Tall Amazon Caatinga. Low Bana (maximum tree height usually below 5 m) follows next. The central part is occupied by Open Bana in which even lower trees are very widely spaced. Destructive phytomass sampling was carried out for chemical analyses in seven plots along a 150 m line across the zonation. The total dry matter of living plants including roots of Tall Bana (30–32 kg/m2) compares rather well with 41 kg/m2 in Tall Amazon Caatinga. This is only 9–14 kg/m2 in Low Bana, and 4–6 kg/m2 in Open Bana. The average root % of total phytomass increases from 41% in Tall Bana to 63% in Low Bana, and is 88% in Open Bana. Average total dry dead above-ground phytomass (including standing trees and stumps) declines from 1 kg/m2 in Tall Bana to 0.2 kg/m2 in Open Bana. An accumulation of dead matter in Low and Open Bana, relative to the above-ground phytomass of living plants, is noted and this contrasts with the general absence of raw humus in the soil. Eighty-two species of woody plants (dbh≥1 cm) were recorded on the total plot area (640 m2); 90% of the species are also known to occur in Tall Amazon Caatinga. The species number declines from 59 in Tall Bana to 18 in Open Bana. Mesophylls sensu strictu dominate in Tall Bana, while notophylls are dominant in Low and Open Bana. Herbaceous species are less numerous: most of them belong to the Araceae, Bromeliaceae, Orchidaceae, Droseraceae, Eriocaulaceae and Xyridaceae.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00032183
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  • 2
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    Darstellung und Kristallstruktur von 3-(Lithiomethyl)-1,1,2,2-tetramethylcyclopropan, einer stabilen Cyclopropylmethyllithium-Verbindung (1984)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 117 (1984), S. 2547-2554 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis and Crystal Structure of 3-(Lithiomethyl)-1,1,2,2-tetramethylcyclopropane, a Stable Cyclopropylmethyllithium CompoundThe cyclic chlorine and mercury compounds 6 and 9 as well as the open-chain chloro compound 7 react with lithium power in diethyl ether to afford the pure cyclopropylmethyllithium compound 10 completely free of diethyl ether. Only at - 60°C starting with 7 besides 10.8% of the corresponding open-chain organolithium compound 11 was detected. X-ray analysis of 10 showed solvent-free hexameric clusters with the lithium atoms forming a trigonal antiprism with unoccupied trianglular faces on the top and at the bottom while each of the six laterally triangular faces is coordinated to a 2,2,3,3-tetramethylcyclopropylmethyl ligand.
    Notes: Sowohl die cyclischen Chlor- und Quecksilberverbindungen 6 und 9 als auch die offenkettige Chlorverbindung 7 liefern bei der Umsetzung mit Lithiumpulver in Diethylether die reine etherfreie Cyclopropylmethyllithium-Verbindung 10. Nur bei - 60°C lassen sich ausgehend von 7 noch 8% der entsprechenden offenkettigen Lithiumverbindung 11 neben 10 nachweisen. Die Röntgenstrukturanalyse von 10 ergab hexamere Cluster, in denen die Lithiumatome ein trigonales Antiprisma bilden, dessen obere und untere Dreiecksfläche unbesetzt ist, während über jeder der sechs seitlichen Dreiecksflächen ein 2,2,3,3-Tetramethylcyclopropylmethyl-Rest koordiniert ist.
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    URL: http://dx.doi.org/10.1002/cber.19841170802
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  • 3
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    Protonenresonanz-Spekroskopie ungesättigter Ringsysteme, XXIX1). Einfache Synthese von Benzocycloocten durch Protonierung von Biphenylen-Dianion (1984)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 117 (1984), S. 1069-1076 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Proton Resonance Spectroscopy of Unsaturated Ringsystems, XXIX. Simple Synthesis of Benzocyclooctene by Protonation of Biphenylene DianionBiphenylene dianion (1) reacts with H2O to give 4a,8b-dihydrobiphenylene (3) that opens thermally to give benzocyclooctene (4) (yield 〉 80%). At 0°C 3 has a half life of 1 min. The activation parameters of the rearrangement 3 → 4 are δH* = 78.8 ± 5.0 kJ/mol and δS* = - 7.3 ± 8.7 j/mol K. 3 reacts with maleic anhydride to give a Diels-Alder adduct, whose structure has been determined by X-ray analysis.
    Notes: Biphenylen-Dianion (1) reagiert mit H2O zu 4a,8b-Dihydrobiphenylen (3). das thermisch zu Benzocylcoocten (4) öffnet (Ausb. 〉 80%). Bei 0°C besitzt 3 eine Halbwertszeit von 1 min. Die Aktivierungsparameter der Umlagerung 3 → 4 betragen δH* = 78.8 ± 5.0 kJ/mol und δS* = - 7.3 ± 8.7 J/mol K. 3 liefert mit Maleinsäureanhydrid ein Diels-Alder-Addukt, dessen Struktur röntgenographisch bestimmt wurde.
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    URL: http://dx.doi.org/10.1002/cber.19841170321
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  • 4
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    Kristallstruktur sowie FIR- und Ramanspektren von GaCrSe3 (1988)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 566 (1988), S. 55-61 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Crystal Structure, F.I.R., and Raman Spectra of GaCrSe3The crystal structure of GaCrSe3 oP20 was determined by single crystal X-ray methods (final R = 1.6% for 949 observed reflections, I 〉 2σI). GaCrSe3 crystallizes in the orthorhombic space group Pnma with Z = 4 (CuTaS3 type) and a = 1011.82(7), b = 373.45(3), and c = 1239.2(1) pm. The structure is built up on rectangular columns in [010] of edge shared GaSe4 tetrahedra and CrSe6 octahedra of the sequence (GaSe4)(CrSe6)2(GaSe4) in [101] and [101], respectively, which are connected via the corners in such a manner that channels in [010] of trigonal prismatic cavities are formed. The single crystals were grown by vapour phase transport method using I2 as transporting agent. The f.i.r. and Raman spectra of GaCrSe3 as well as a group theoretical treatment of the phonon modes are reported. In the ternary system Ga2Se3-Cr2Se3, monoclinic Ga1,3Cr0,7Se3 and hexagonal CrGa1,66Se4 (FeGaS4-type) have been established additionally to the orthorhombic GaCrSe3.
    Notes: Die Kristallstruktur der bisher nicht beschriebenen Verbindung GaCrSe3oP20 wurde anhand von Einkristalldaten bestimmt (R = 1,6% für 949 beobachtete (I 〉 2σI) Reflexe). GaCrSe3 kristallisiert in der orthorhombischen Raumgruppe Pnma mit Z = 4 (CuTaS3-Typ) sowie a = 1011,82(7), b = 373,45(3) und c = 1239,2(1) pm. Der Struktur liegen rechteckige Säulen in [010] aus kantenverknüpften CrSe6-Oktaedern und GaSe4-Tetraedern der Folge (GaSe4)(CrSe6)2(GaSe4) in [101] bzw. [101] zugrunde, die über die Ecken der Oktaeder- und Tetraederbaueinheiten so verknüpft sind, daß in [010] angeordnete Kanäle mit trigonal-prismatischen Lücken gebildet werden. Die Darstellung von Einkristallen des GaCrSe3 erfolgte durch Gasphasen-transport mit Iod. Das FIR- und Ramanspektrum des GaCrSe3 sowie die Schwingungsabzählung der Gitterschwingungen dieses Strukturtyps werden mitgeteilt. Neben dem orthorhombischen GaCrSe3 existieren im System Ga2Se3-Cr2Se3 monoklines Ga1,3Cr0,7Se3 und hexagonales CrGa1,66Se4 (FeGa2S4-Typ).
    Additional Material: 2 Ill.
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    URL: http://dx.doi.org/10.1002/zaac.19885660108
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  • 5
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    Neutronenbeugungsmessungen an SrBr2 · H2O und Srl2 · H2O, symmetrisch und asymmetrisch gebundene Kristallwasser-moleküle (1988)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 566 (1988), S. 49-54 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Neutron Diffraction Studies of SrBr2 · H2O and SrI2 · H2O, Symmetrically and Asymmetrically Bonded Water MoleculesSingle crystal neutron diffraction studies were performed on the isostructural (space group Pnma) SrBr2 · H2O and SrI2 · H2O. Lengths and structure of the hydrogen bonds are correlated with Raman and IR spectroscopic data. The bifurcated and trifurcated H-bonds present are altogether significantly stronger than linear ones with similar H…Br and H…I distances, respectively. In the case of SrI2 · H2O, the H-bonds of the two hydrogen atoms of the water molecules exhibit equal strength (symmetric water molecule) as shown by the respective OH vibrational energies despite the different H…I distances. The water molecule of SrBr2 · H2O is asymmetrically bonded (different strength of the H-bonds).
    Notes: An den isotypen Hydraten SrBr2 · H2O und SrI2 · H2O (Raumgruppe Pnma) wurden Einkristallneutronenbeugungsmessungen vorgenommen. Die Bindungslängen sowie die Anordnung der verzweigten Wasserstoffbrücken werden mit Raman- und IR-spektroskopischen Daten korreliert. Die zwei- bzw. dreifach verzweigten Wasserstoffbrücken sind insgesamt signifikant stärker als gleich lange lineare Brücken zu Br--und I--Ionen. Die von den beiden Wasserstoffatomen des SrI2 · H2O gebildeten H-Brücken sind, wie die entsprechenden OH-Schwingungsfrequenzen zeigen, trotz der unterschiedlichen H…I-Abstände gleich stark (H2O symmetrisch). Das Kristallwassermolekül des SrBr2 · H2O ist asymmetrisch gebunden (unterschiedlich starke H-Brücken).
    Additional Material: 1 Ill.
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    URL: http://dx.doi.org/10.1002/zaac.19885660107
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  • 6
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    Beiträge zur Chemie des Schwefels. 115. Kristall- und MolekülStruktur von BenzopentathiepinProfessor Günther Rienäcker gewidmet (1979)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 452 (1979), S. 37-42 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Contributions to the Chemistry of Sulfur. 115. Crystal and Molecular Structure of BenzopentathiepineThe structure of benzopentathiepine has been determined from three-dimensional single-crystal X-ray data. The crystal are monoclinic, space group P21/c, with 4 molecules in the unit cell of dimensions a = 6.942(4) Å, b = 10.223(10) Å, c = 13.015(8) Å, β = 102,15(10)°. The conformation of the seven-membered ring is the chair form. Details of the conformation are discussed. Bond distances, bond angles, and dihedral angles are compared with those in other molecules, which have similar structure.
    Notes: Die Struktur von Benzopentathiepin wurde aus Einkristalldaten röntgenographisch bestimmt. Die Kristalle sind monoklin, Raumgruppe P21/c, mit 4 Molekeln in der Elementarzelle. Die Gitterkonstanten sind: a = 6,942(4) Å, b = 10,223(10) Å, c = 13,015(8) Å, β = 102,15(10)°. Der siebengliedrige Ring liegt in der Sesselkonformation vor. Einzelheiten der Konformation werden diskutiert. Bindungslängen und -winkel sowie die Diederwinkel werden mit denen anderer Molekeln ähnlicher Struktur verglichen.
    Additional Material: 3 Ill.
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    URL: http://dx.doi.org/10.1002/zaac.19794520106
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  • 7
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    Zur Kenntnis der Hydrate des Bariumchlorids. Röntgenographische, thermoanalytische, Raman- und IR-spektroskopische Untersuchungen (1979)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 457 (1979), S. 84-90 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Hydrates of Barium Chloride. X-ray, Thermoanalytical, Raman, and I.R. DataIn the system BaCl2—H2O the hydrates BaCl2 · 2 H2O, BaCl2 · 1 H2O, BaCl2 · 1/2 H2O, and BaCl2 · uH2O were obtained. X-ray powder data, i.r. and Raman spectra, as well as thermoanalytical measurements (TG, DTA) are reported. BaCl2 · 1 H2O and BaCl2 · 1/2 H2O, which are both isotype with the corresponding hydrates of SrCl2, were prepared by dehydration of BaCl2 · 2 H2O or by back hydration of anhydrous BaCl2 with the calculated amounts of water. BaCl2 · uH2O (u ≍ 1) is formed as the primary product by the reaction of anhydrous BaCl2 with water vapour at room temperature. Preparation methods of salt hydrates by controlled back hydration of the anhydrous salts are reported.
    Notes: Im System BaCl2—H2O wurden folgende Hydrate erhalten: BaCl2 · 2 H2O, BaCl2 · 1 H2O, BaCl2 · 1/2 H2O und BaCl2 · uH2O. Röntgenpulverdaten, IR- und Raman-Spektren sowie das Ergebnis thermoanalytischer Messungen (TG, DTA) werden mitgeteilt. BaCl2 · 1 H2O und BaCl2 · 1/2 H2O, die mit den entsprechenden Hydraten des SrCl2 isotyp sind, werden beim Entwässern von BaCl2 · 2 H2O oder durch Umsetzen von wasserfreiem BaCl2 mit der berechneten Menge Wasser erhalten. BaCl2 · uH2O (u ≍ 1) bildet sich als primäres Reaktionsprodukt bei der Umsetzung von wasserfreiem BaCl2 mit Wasserdampf bei Raumtemperatur. Die Darstellung phasenreiner niederer Salzhydrate durch kontrollierte Rückbewässerung der wasserfreien Salze wird beschrieben.
    Additional Material: 3 Ill.
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    URL: http://dx.doi.org/10.1002/zaac.19794570109
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  • 8
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    Zur Kenntnis der Sulfite und Sulfithydrate des Eisens und Nickels Röntgenographische, thermoanalytische, IR- und Raman-spektroskopische UntersuchungenProfessor Marianne Baudler zum 60. Geburtstage am 27. April 1981 gewidmet (1981)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 475 (1981), S. 165-174 
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    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: In den Systemen FeSO3—H2O und NiSO3—H2O konnten folgende Hydrate erhalten werden: α-FeSO3 · 3H2O, γ-FeSO3 · 3H2O, FeSO3 · 2,5 H2O, FeSO3 · 2 H2O, NiSO3 · 6 H2O, NiSO3 · 3 H2O, NiSO3 · 2,5 H2O und NiSO3 · 2 H2O. Die Gitterdaten der folgenden Hydrate wurden anhand von Einkristallmessungen bestimmt: γ-FeSO3 · 3 H2O: a = 965,9(1), b = 557,1(1), c = 944,7(1) pm, Z = 4, FeSO3 · 2 H2O (P21/n): a = 645,6(1), b = 863,1(1), c = 761,2(1) pm, β = 99,84(1)°, Z = 4, NiSO3 · 3 H2O: a = 945,0(1), b = 547,2(1), c = 932,5(1) pm, Z = 4, NiSO3 · 2,5 H2O (P41212): a = b = 935,3(1), c = 1016,6(1) pm, Z = 8, NiSO3 · 2 H2O (P21/n): a = 631,4(1), b = 851,0(1), c = 744,7(1) pm, β = 98,91(1)°, Z = 4. Die IR- und Raman-Spektren sowie das Ergebnis thermoanalytischer Messungen (DTA, DTG, Röntgenheizaufnahmen) werden mitgeteilt. Die bei Sulfiten und Sulfithydraten zweiwertiger Metalle bisher beobachteten Strukturtypen werden diskutiert.Sulfites and Sulfite Hydrates of Iron and Nickel. X-ray, Thermoanalytical, I.R., and Raman DataIn the systems FeSO3—H2O and NiSO3—H2O the following hydrates have been found: α-FeSO3 · 3H2O, γ-FeSO3 · 3H2O, FeSO3 · 2,5 H2O, FeSO3 · 2 H2O, NiSO3 · 6 H2O, NiSO3 · 3 H2O, NiSO3 · 2,5 H2O and NiSO3 · 2 H2O. The following crystal data have been determined by single crystal measurements: γ-FeSO3 · 3 H2O: a = 965,9(1), b = 557,1(1), c = 944,7(1) pm, Z = 4, FeSO3 · 2 H2O (P21/n): a = 645,6(1), b = 863,1(1), c = 761,2(1) pm, β = 99,84(1)°, Z = 4, NiSO3 · 3 H2O: a = 945,0(1), b = 547,2(1), c = 932,5(1) pm, Z = 4, NiSO3 · 2,5 H2O (P41212): a = b = 935,3(1), c = 1016,6(1) pm, Z = 8, NiSO3 · 2 H2O (P21/n): a = 631,4(1), b = 851,0(1), c = 744,7(1) pm, β = 98,91(1)°, Z = 4. IR, Raman, and thermoanalytical (DTA, DTG, high temperature X-ray) data are presented. The structure types found for sulfites and sulfite hydrates of bivalent metals are discussed.
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    URL: http://dx.doi.org/10.1002/zaac.19814750419
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  • 9
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    Zur Kenntnis der Sulfite des Strontiums, Bariums, Bleis, Cadmiums und Mangans. Darstellung von Einkristallen durch GelkristallisationProfessor Franz Fehér zum 80. Geburtstage am 22. Januar 1983 gewidmet (1983)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 496 (1983), S. 21-28 
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    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Anhydrous Sulfites of Strontium, Barium, Lead, Cadmium, and Manganese. Preparation of Single Crystals by Gel Crystallisation. X-ray, Thermoanalytical, I. R., and Raman DataSingle crystals of the anhydrous sulfites BaSO3, CdSO3-I, PbSO3, and Na2Cd3(SO3)4, and the hitherto unknown sulfites CdSO3-II and CdSO3-III have firstly been obtained by gel crystallization technique. Crystal data determined by single crystal measurements see „Inhaltsübersicht“.I. R., Raman, and thermoanalytical (DTA, TG, DTG, high temperature X-ray) data are presented and discussed. CdSO3-I is the thermodynamically stable form of the three polymorphic cadmium sulfites at ambient temperature.
    Notes: Durch Gelkristallisation in einem Kieselsäuregel konnten erstmals Einkristalle der wasserfreien Sulfite BaSO3, CdSO3-I, PbSO3 und Na2Cd3(SO3)4 sowie der bisher nicht bekannten Sulfite CdSO3-II und CdSO3-III erhalten werden. Die Gitterdaten folgender Sulfite wurden anhand von Einkristallmessungen bestimmt: SrSO3 und BaSO3 (P21/m): a = 634,4(1), b = 526,7(1), c = 443,3(1) pm, β = 106,51(1)° und a = 664,9(1), b = 549,0(1), c = 464,7(1) pm, β = 106,25(1)°, Z = 2, PbSO3 (Pnma): a = 790,3(1), b = 548,8(1), c = 680,2(1) pm, Z = 4, CdSO3-I (P21/c): a = 443,9(1), b = 860,8(1), c = 718,3(1) pm, β = 94,53(1)°, Z = 4, CdSO3-II (P21/c): a = 554,7(1), b = 1254,2(1), c = 849,9(1) pm, β = 100,00(1)°, Z = 8, CdSO3-III (R3): a = 814,5(1) pm, α = 109,04(1)°, Z = 6, Na2Cd3(SO3)4 (C2/c, Cc): a = 1612,8(2), b = 537,2(1), c = 1293,6(1) pm, β = 90,17(1)°, Z = 4. Die IR- und Ramanspektren sowie das Ergebnis thermoanalytischer Messungen (DTA, TG, DTG, Röntgenheizaufnahmen) werden diskutiert. Von den drei polymorphen Cadmiumsulfiten ist CdSO3-I die bei Raumtemperatur thermodynamisch stabile Form.
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    URL: http://dx.doi.org/10.1002/zaac.19834960103
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  • 10
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    Zur Kenntnis der Hydrate des Typs MX2 · 1 H2O mit M = Sr, Ba und X = Cl, Br, I. Kristallstrukturen des Strontiumchlorid-Monohydrats, SrCl2 · 1 H2O, und des Strontiumbromid-Monohydrats, SrBr2 · 1 H2OProfessor Rudolf Hoppe zum 60. Geburtstage am 29. 10. 1982 gewidmet (1983)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 497 (1983), S. 151-156 
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    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On Hydrates of the Type MX2 · 1 H2O with M = Sr, Ba and X = Cl, Br, I. Crystal Structures of Strontium Chloride Monohydrate, SrCl2 · 1 H2O, and Strontium Bromide Monohydrate, SrBr2 · 1 H2OThe structures of SrCl2 · 1 H2O, orthorhombic, Pnma, a = 1088.1(1), b = 416.2(1), c = 886.4(1) pm, Z = 4, dc = 2.92 Mg m-3, R = 0.052 for 755 reflections, and of SrBr2 · 1 H2O, orthorhombic, Pnma, a = 1146.4(1), b = 429,5(1), c = 922.9(1) pm, Z = 4, dc = 3.88 Mg m-3, R = 0.056 for 762 reflections have been determined from a Patterson synthesis and refined by Fourier and Least Squares methods. The structure consists of [SrX2 = H2O]n-layers normal to [100] and Sr—H2O—Sr—H2O-chains parallel [010]. The Sr—O distances are 265.1(3) pm, SrCl2 · 1 H2O, and 265.9(4) pm, SrBr2 · 1 H2O. The shortest Sr—Cl and Sr—Br distances (298.9(1) and 315.3(1) pm) are within the layers. The environment of oxygen and strontium is a distorted tricapped trigonal prism. The orientation of the water molecules has been determined from vibrational spectroscopic measurements. The hydrogen atoms H1 and H2 form bifurcated hydrogen bonds of different strength to neighbouring halide ions. The corresponding O···X distances are 331.9(4) and 320.2(4) pm, SrCl2 · 1 H2O, and 340.8(4) and 333.8(4) pm, SrBr2 · 1 H2O. The other O—X distances are between 310.3(5) and 323.7(5) pm, SrCl2 · 1 H2O, and 323.5(5) and 333.2(6) pm, SrBr2 · 1 H2O.
    Notes: Die Strukturen des SrCl2 · 1 H2O, orthorhombisch, Pnma, a = 1088,1(1), b = 416,2(1), c = 886,4(1) pm, Z = 4, drö = 2,92 Mg m-3, R = 0,052 für 755 Reflexe und des SrBr2 · 1 H2O, orthorhombisch, Pnma, a = 1146,4(1), b = 429,5(1), c = 922,9(1) pm, Z = 4, drö = 3,88 Mg m-3, R = 0,056 für 762 Reflexe wurden nach der Schweratommethode bestimmt und mit Fourier- und Least-squares-Verfahren verfeinert. Die Struktur besteht aus [SrX2 · H2O]n-Schichten senkrecht [100] mit Sr—H2O—Sr—H2O-Zick-Zack-Ketten parallel [010]. Die Sr—O-Abstände betragen 265,1(3) pm beim SrCl2 · 1 H2O und 265,9(4) pm beim SrBr2 · 1 H2O. Die kürzesten Sr—Cl- und Sr—Br-Abstände (298,9(1) bzw. 315,3(1) pm) liegen innerhalb der Schichten. Die Umgebung des Sauerstoffs und des Strontiums ist verzerrt tricapped-trigonal-prismatisch. Die Orientierung der Kristallwassermoleküle konnte mit Hilfe schwingungsspektroskopischer Messungen bestimmt werden. Die Wasserstoffatome H1 und H2 bilden verzweigte, unterschiedlich starke Wasserstoffbrücken zu benachbarten Halogenidionen aus. Die entsprechenden O···X-Abstände sind 331,9(4) und 320,2(4) pm beim SrCl2 · 1 H2O bzw. 340,8(4) und 333,8(4) pm beim SrBr2 · 1 H2O. Die übrigen O—X-Abstände liegen zwischen 310,3(5) und 323,7(5) pm beim SrCl2 · 1 H2O bzw. 323,5(5) und 333,2(6) pm beim SrBr2 · 1H2O.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19834970213
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