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  • crystal structure  (5)
  • LUNAR AND PLANETARY EXPLORATION  (4)
  • 1
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    Laser Ar-39-Ar-40 study of Apollo 17 basalts (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Three Apollo 17 basalts were studied by the laser Ar-39-Ar-40 method. The 70215 basalt has a normal well-behaved Ar-39-Ar-40 release pattern; the 70017 basalt has a disturbed release pattern which indicates a limited intermediate maximum age followed by a broad low-age region; and the 75035 basalt has a pattern initially similar to 70017 that is followed by a high-temperature maximum age. The laser study shows that all mineral systems in 70215 have small and uniform temperature losses, while the laser-determined ages for 70017 and 75035 are, apparently, primarily controlled by the minerals containing mesostasis inclusions. It is possible that the drop in ages observed by the conventional Ar-39-Ar-40 method was due not only to recoil of Ar-39 during neutron irradiation but also to gas loss from some minerals. It is suggested that the plagioclases are the best minerals to use for a reliable age.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar Science Conference; Mar 14, 1977 - Mar 18, 1977; Houston, TX
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    NASA TECHNICAL REPORTS
  • 2
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    Laser /39/Ar-/40/Ar dating of two clasts from consortium breccia 73215 (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A laser Ar-39-Ar-40 study of the components of an ANT-suite anorthositic gabbro and a black aphanite from a consortium breccia is reported. A wide range of K-Ar ages is found for the plagioclase in the anorthositic gabbro; at the centers of the largest grains is material showing the greatest age (older than 4.11 billion years) while the youngest material (3.81-3.88 billion years) is found near the grain margins. Partial outgassing of the clasts upon incorporation into the breccia could account for the age patterns. The black aphanite clast appears to be cogenetic with the aphanite that forms the breccia matrix. The time of crystallization of a lunar granite has also been measured by the laser technique.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar and Planetary Science Conference; Mar 13, 1978 - Mar 17, 1978; Houston, TX
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Laser probe /Ar-39/-/Ar-40/ dating of materials from consortium breccia 73215 (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The unique capacity of the laser-probe (Ar-39)-(Ar-40) method to determine ages of constituents in a rock sample which are only of the order of 100 microns apart has been applied to measure ages of the different constituents of consortium breccia 73215. Evidence is given that the age of the melt-derived ground mass, 4.01 + or - 0.05 billion years, has no chronological significance. Instead, the best estimate for the age of the breccia-forming event, about 3.90 billion years, comes from the study of two clasts only a few hundred micrometers in size. The interpretation of this age as the age of the breccia-forming event is also supported by the studies of other consortium members and suggests a reinterpretation of the ages of most of the other Apollo 17 highland breccias.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar Science Conference; Mar 14, 1977 - Mar 18, 1977; Houston, TX
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    NASA TECHNICAL REPORTS
  • 4
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    Helium, neon, and argon on sunlit and shaded surfaces of lunar rock 12054 (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar Science Conference; Mar 14, 1977 - Mar 18, 1977; Houston, TX
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    NASA TECHNICAL REPORTS
  • 5
    Electronic Resource
    Electronic Resource
    Zur Chemie des Dimesityleisens. VIII. Lösungsverhalten von Tetramesityldieisen und die Kristallstruktur eines Dimethoxyethan-Addukts (1996)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 622 (1996), S. 756-758 
    Details
    ISSN: 0044-2313
    Keywords: Dimesityliron ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Chemistry of Dimesityl Iron. VIII Solution Behaviour of Tetramesityldiiron and Crystal Structure of Dimesityl(dimethoxyethane)ironThe dimer dimesityliron yields in polar solvents solvated monomers. The adduct with dimethoxyethane was isolated and characterized by X-ray structure determination.
    Notes: Während Dimesityleisen in unpolaren Lösungsmitteln dimer vorliegt, spaltet es in stärker polaren Lösungsmitteln in solvatisierte Monomere auf. Mit Dimethoxyethan wurde ein Addukt isoliert und strukturell charakterisiert.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19966220433
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  • 6
    Electronic Resource
    Electronic Resource
    Zur Chemie des Dimesityleisens. X. Mesityleisenkomplexe [FeMes(X)]2 mit zentraler {Fe2(μ-Mes)2}-Einheit (Mes = C6H2-2,4,6-(CH3)3)Professor Rudolf Taube zum 65. Geburtstag gewidmet (1996)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 622 (1996), S. 1968-1974 
    Details
    ISSN: 0044-2313
    Keywords: Dimesityl iron ; aryloxide complexes ; diketonate complexes ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Chemistry of Dimesityl Iron. X. Mesityl Iron Complexes [FeMes(X)]2 with a Central {Fe2(μ-Mes)2} Unit (Mes = C6H2-2,4,6-(CH3)3)Dimeric complexes [{MesFe(OAryl)}2] with coordination number (CN) of 3 are obtained from Fe2Mes4 1 by partial acidolyses with 2,6-di-tert-butyl-substituted phenols (HOAryl). 1 reacts with 1,3-diketones in a molar ratio of 1:2 to [{MesFe(diketonate)}2] with CN 4. A central {Fe2(μ-Mes)2}-unit with short Fe - Fe distances of 2.56 to 2.63 Å (1: 2.615 Å) is found in both types of complexes. The mixed ligand complexes react with an excess of phenol or diketone to {Fe(OAryl)2} or {Fe(diketonate)2}, respectively. 1 reacts with HOAryl in the molar ratio of 1:1 to [Fe2(μ-Mes)2Mes(OAryl)]. The structures of [Fe2(μ-Mes)2(OC6H2-2,6-tBu2-4-CH3)2] (3), [Fe2(μ-Mes)2Mes(OC6H2-2,4,6-tBu3)] (5) and [Fe2(μ-Mes)2{(tBuCO)2CH}2] (9) are presented.
    Notes: Durch partielle Acidolyse von Fe2Mes4 1, mit 2,6-di-tert-butyl-substituierten Phenolen gelangt man zu dimeren Komplexen [{MesFe(OAryl)}2] der Koordinationszahl drei am Fe-Atom. Setzt man 1 mit 1,3-Diketonen ebenfalls im Verhältnis 1:2 um, entstehen die Verbindungen [{MesFe(diketonat)}2] mit Koordinationszahl vier. In beiden Komplextypen liegt eine zentrale {Fe2(μ-Mes)2}-Einheit mit kurzen Fe - Fe-Abständen von 2,56 bis 2,63 Å vor (1: 2,615 Å). Bricht man die Reaktion von 1 mit HO-Aryl bei einem Molverhältnis 1:1 ab, lassen sich die Primärprodukte [Fe2(μ-Mes)2Mes(OAryl)] isolieren. Die Gemischtligandenkomplexe können zu {Fe(OAryl)2} bzw. {Fe(diketonat)2} weiterreagieren. Die Strukturen von [Fe2(μ-Mes)2(OC6H2-2,6-tBu2-4-CH3)2] (3), [Fe2(μ-Mes)2Mes(OC6H2-2,4,6-tBu3)] (5) und [Fe2(μ-Mes)2{(tBuCO)2CH}2] (9) werden mitgeteilt.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19966221126
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  • 7
    Electronic Resource
    Electronic Resource
    Zur Polymorphie und Pseudosymmetrie der Hydrate MSeO3 · H2O (M = Mn, Co, Ni, Zn, Cd)Professor Roger Blachnik zum 60. Geburtstag gewidmet (1996)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 622 (1996), S. 1886-1892 
    Details
    ISSN: 0044-2313
    Keywords: Selenites ; hydrates ; X-ray ; IR ; crystal structure ; pseudosymmetry ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Polymorphic and Pseudosymmetrical Hydrates MSeO3 · H2O (M = Mn, Co, Ni, Zn, Cd)By crystallization from aqueous solutions of MSeO3 and M(HSeO3)2, the selenites MSeO3 · H2O (M = Mn, Co, Ni, Zn, Cd) were obtained and characterized by means of X-ray diffraction and IR-spectroscopy. The crystal structure of ZnSeO3 · H2O was determined. The IR spectra indicate that the hydrates are isotypic and contain H2O molecules of symmetry mm2. However, the X-ray data show different structure types with H2O molecules of site symmetry m or 1. CdSeO3 · H2O and MnSeO3 · H2O are isotypic (o.rh., MnSeO3 · D2O type). CoSeO3 · H2O (mon.) as well as the isotypic NiSeO3 · H2O and ZnSeO3 · H2O (mon.) form new structure types. These findings are discussed on the basis of the crystal structure of ZnSeO3 · H2O (P21/n, a = 477.9(1), b = 1319.4(5), c = 570.1(1) pm, β = 90.84(2)°, Z = 4, Dx = 3.886 g · cm-3, R = 0.035 for 722 reflections with I 〉 2σ1) and the local pseudosymmetry of its components, i.e., layers ∞2[ZnSeO3 · H2O] of ZnO6 octahedra sharing four equatorial vertices, SeO32- anions and H2O molecules.
    Notes: Durch Kristallisation aus MSeO3- und M(HSeO3)2-Lösungen wurden die Selenite MSeO3 · H2O (M = Mn, Co, Ni, Zn, Cd) erhalten und röntgenographisch sowie IR-spektroskopisch charakterisiert. Von ZnSeO3 · H2O wurde die Kristallstruktur bestimmt. Die IR-Spektren deuten auf Isotypie der Hydrate und H2O-Moleküle der Symmetrie mm2. Die Röntgenbeugungsdaten zeigen dagegen das Vorliegen verschiedener Strukturtypen mit H2O-Molekülen der Lagesymmetrie m oder 1. CdSeO3 · H2O und MnSeO3 · H2O sind isotyp (o.rh., MnSeO3 · D2O-Typ). CoSeO3 · H2O (mon.) sowie die isotypen NiSeO3 · H2O und ZnSeO3 · H2O (mon.) kristallisieren in neuen Strukturtypen. Diese Befunde werden auf der Basis der Kristallstruktur von ZnSeO3 · H2O (P21/n, a = 477,9(1), b = 1319,4(5), c = 570,1(1) pm, β = 90,84(2)°, Z = 4, Dx = 3,886 g · cm-3, R = 0,035 für 722 Reflexe mit I 〉 2σ1) und der lokalen Pseudosymmetrie ihrer Bausteine (Schichten ∞2[ZnSeO3 · H2O] aus vierfach eckenverknüpften ZnO6-Oktaedern, SeO32--Anionen und H2O-Moleküle) diskutiert.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19966221113
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  • 8
    Electronic Resource
    Electronic Resource
    Zur Kristallstruktur von KGaO2 und NaGaO2(II) [1]Herrn Professor Wolfgang Beck zum 60. Geburtstage am 5. Mai 1992 gewidmet (1992)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 611 (1992), S. 73-80 
    Details
    ISSN: 0044-2313
    Keywords: Potassium, sodium gallate ; preparation ; crystal structure ; MAPLE calculation ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The Crystal Structure of KGaO2 and NaGaO2(II)By annealing intimate mixtures of K2O, Na2O and β-Ga2O3 (K : Na : Ga = 2.2 : 1.1 : 1) we obtained single crystals of K2Na4[(GaO3)2] and KGaO2 (Ag-cylinder; 600°C, 26 d). Structure refinement for KGaO2 (four-circle diffractometer data, Mo-Kα, 1 390 or 1 390 Io(hkl); R = 5.55%, Rw = 3.05%) confirms the space group Pbca; a = 552.1 pm, b = 1 107.5 pm, c = 1 580.7 pm, Z = 16.According to K[GaO4/2] we have a stuffed cristobalite-related structure.Single crystals of NaGaO2(II) were grown by annealing intimate mixtures of Na2O2 and GaAs (Na2O2 : GaAs 4.1 : 1) in Ag-cylinders that were not completely closed (570°C, 6 weeks). Structure refinement for NaGaO2(II) (four-circle diffractometer data, Mo-Kα, 588 of 616 Io(hkl); R = 4.54%, Rw = 4.06%) confirms the spacegroup Pna21; a = 549.8(1) pm, b = 720.6(1) pm, c = 529.8(1) pm, Z = 4. In NaGaO2(II) we have a wurtzite-related structure.
    Notes: Beim Tempern inniger Gemenge von K2O, Na2O und β-Ga2O3 (vor Verreiben: K : Na : Ga = 2,2 : 1,1 : 1) erhielten wir neben Einkristallen von K2Na4[(GaO3)2] auch solche von KGaO2 (Ag-Zylinder, 600°C, 26 d). Die Strukturverfeinerung (Vierkreisdiffraktometerdaten, Mo-Kα, 1 390 von 1 390 Io(hkl); R = 5,55%, Rw = 3,05%) belegt die Raumgruppe Pbca; a = 552,1 pm, b = 1 107,5 pm, c = 1 580,7 pm, Z = 16.Es liegt eine aufgefüllte Cristobalit-Variante gemäß K[GaO4/2] vor.Einkristalle von NaGaO2(II) erhielten wir durch Tempern inniger Gemenge von Na2O2 und GaAs (vor Verreiben: Na2O2: GaAs 4,1 : 1) in nicht ganz verschlossenen Ag-Zylindern (570°C, 6 Wochen). Die Strukturverfeinerung (Vierkreisdiffraktometerdaten, Mo-Kα, 588 von 616 Io(hkl); R = 4,54%, Rw = 4,06%) belegt die Raumgruppe Pna21; a = 549,8(1) pm, b = 720,6(1) pm, c = 529,8(1) pm, Z = 4 (Guinier-de Wolff-Daten). NaGaO2(II) ist eine Ordnungsvariante des Wurtzit-Typs.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19926110512
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  • 9
    Electronic Resource
    Electronic Resource
    Zur Chemie des Dimesityleisens. XI. Reaktion von Dimesityleisen mit β-Diketonen - Strukturen von Bis(diethylether)-bis(1,3-diphenylpropan-1,3-dionato)eisen(II) und Poly[bis(2,2,6,6-tetramethylheptan-3,5-dionato)eisen(II)-μ-(1,4-dioxan)] (1997)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 623 (1997), S. 155-158 
    Details
    ISSN: 0044-2313
    Keywords: Dimesityliron ; diketonate complexes ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Chemistry of Dimesityl Iron. XI. Reaction of Dimesityl Iron with β-Diketones - Structures of Bis(diethylether)-bis(1,3-diphenylpropane-1,3-dionato)iron(II) and Poly[bis(2,2,6,6-tetramethylheptane-3,5-dionato)iron(II)-μ-(1,4-dioxan)]Reactions of tetramesityl diiron, Fe2Mes4 1, with β-diketones in the molar ratio of 1:4 form the diketonate complexes [Fe(diketonate)2]. Acidolysis of 1 with 1,3-diphenylpropane-1,3-dione (Hdbm) forms [Fe(dbm)2(OEt2)2] and with 2,2,6,6-tetramethylheptane-3,5-dione the coordination polymer [{Fe(dpm)2(μ-dioxane)}n] is obtained. The crystal structures of both complexes are presented.
    Notes: Die Umsetzung von Tetramesityldieisen, Fe2Mes4 1, mit β-Diketonen im Verhältnis 1 : 4 ergibt die Diketonatoeisenkomplexe [Fe(diketonat)2]. Aus 1 und Dibenzoylmethan (Hdbm) sowie Dipivaloylmethan (Hdpm) wurden [Fe(dbm)2(OEt2)2] und [{Fe(dpm)2(μ-dioxan)}n] hergestellt und ihre Strukturen bestimmt.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19976230126
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