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  • 1
    Electronic Resource
    Electronic Resource
    THE AGE OF THE GALACTIC GLOBULAR CLUSTER SYSTEM (1996)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Astronomy and Astrophysics 34 (1996), S. 461-510 
    Details
    ISSN: 0066-4146
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Physics
    Notes: Abstract A careful assessment of current uncertainties in stellar physics (opacities, nuclear reaction rates, equation of state effects, diffusion, rotation, and mass loss), in the chemistry of globular cluster (GC) stars, and in the cluster distance scale, suggests that the most metal-poor (presumably the oldest) of the Galaxy's GCs have ages near 15 Gyr. Ages below 12 Gyr or above 20 Gyr appear to be highly unlikely. If these = 2 sigma limits are increased by ~ 1 Gyr to account for the formation time of the globulars, and if standard Friedmann cosmologies with the cosmological constant set to zero are assumed, then the GC constraint on the present age of the Universe (t0〉= 13 Gyr) implies that the Hubble constant H0〈= 51 km s-1 Mpc-1 if the density parameter Omega = 1 or 〈= 62 km s-1 Mpc-1 if Omega = 0.3.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.astro.34.1.461
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  • 2
    Electronic Resource
    Electronic Resource
    trans-Dichlorotetrakis(4-methylpyridine)silicon bis(triiodide) chloroform solvate (2000)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 56 (2000), S. 614-615 
    Details
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: At 173 K, the dication of the title compound, C24H28Cl2N4Si2+·2I3−·CHCl3, is located on a crystallographic fourfold rotation axis. The chloro ligands occupy axial positions and the four 4-methylpyridine ligands lie in the equatorial plane. The almost linear I3− ion is located on a crystallographic mirror plane and displays two significantly different I—I bond lengths. Furthermore, chloroform molecules, which are disordered about a centre of inversion, fill the remaining gaps in the crystal structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108270100002791
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  • 3
    Electronic Resource
    Electronic Resource
    Methyl 3-para-anisyl-4-(2-hydroxybenzoyl)isoxazole-5-carboxylate (2000)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 56 (2000), S. e205-e206 
    Details
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The title compound, C19H15NO6, contains a planar isoxazole ring. An intramolecular hydrogen bond is formed between the OH group attached to a phenyl ring and a carbonyl O atom.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108270100004522
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  • 4
    Electronic Resource
    Electronic Resource
    Diels–Alder adducts of maleic anhydride and dienes: new compounds by crystallization (2000)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 56 (2000), S. 1338-1342 
    Details
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: We have determined the crystal structures of bicyclo[2.2.1]hept-2-ene-endo-cis-5,6-dicarboxylic anhydride, C9H8O3, (I), 1,2,3,4,7,7-hexachlorobicyclo[2.2.1]hept-2-ene-endo-cis-5,6-dicarboxylic anhydride diethyl ether solvate, C9H2Cl6O3·0.16C4H10O, (II), bicyclo[2.2.1]hept-2-ene-endo-cis-5,6-dicarboxylic acid, C9H10O4, (III), 1,2,3,4,7,7-hexachlorobicyclo[2.2.1]hept-2-ene-endo-cis-5,6-dicarboxylic acid, C9H4Cl6O4, (IVa) and (IVb), and ethyl 1,2,3,4,7,7-hexachloro-6-carboxybicyclo[2.2.1]hept-2-ene-endo-cis-5-carboxylate monohydrate, C11H8Cl6O4·H2O, (V). Compounds (I) and (II) were prepared by a standard Diels–Alder reaction from maleic anhydride and cyclopentadiene or hexachlorocyclopentadiene, respectively. The crystal-growing processes of these compounds led to surprising results: rapid recrystallization of (I) from diethyl ether and (II) from petroleum ether gave crystals of these compounds, however, crystallization by slow evaporation techniques using common solvents yielded new compounds in which the five-membered heterocycle has been cleaved.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108270100010131
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  • 5
    Electronic Resource
    Electronic Resource
    Dimorphism of ethyl 1,4-dihydro-2,4,6-triphenylpyridine-3-carboxylate (2001)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 57 (2001), S. 772-774 
    Details
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The title compound, C26H23NO2, (Ia) and (Ib), shows polymorphism with crystals obtained from different solvents displaying different crystal structures. However, it is not the geometry of the single molecules nor the hydrogen-bond pattern that is different in (Ia) and (Ib), but the way in which the hydrogen-bonded chains, running along the a-axis direction, are arranged with respect to each other.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108270101005546
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  • 6
    Electronic Resource
    Electronic Resource
    N-tert-Butyl-N′-(5,7-dimethyl-1,8-naphthyridin-2-yl)urea (2001)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 57 (2001), S. 989-990 
    Details
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The title compound, C15H20N4O, has been synthesized as an AADD recognition unit for quadruple hydrogen bonds. All non-H atoms of the molecule apart from two methyl groups of the tert-butyl group lie in a common plane. An intramolecular hydrogen bond is formed connecting two N atoms. In the solid state, the title compound crystallizes as a centrosymmetric dimer connected by N—H...O=C interactions with an N...O distance of 2.824 (2) Å.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108270101008605
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  • 7
    Electronic Resource
    Electronic Resource
    Tetraaquatrinitratoeuropium(III) dihydrate (2001)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 57 (2001), S. i10-i11 
    Details
    ISSN: 1600-5368
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: In the title compound, [Eu(NO3)3(H2O)4]·2H2O, the Eu atom is ten-coordinated by three bidentate nitrates and four water molecules. Furthermore, two water molecules are included in the crystal structure forming a complicated network of hydrogen bonds. [Eu(NO3)3(H2O)4]·2H2O is isostructural with other lanthanide analogues.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S1600536801001271
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  • 8
    Electronic Resource
    Electronic Resource
    Di-n-butylbis(thiophene-2-carboxylato-O,O′)tin(IV) (2001)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 57 (2001), S. m65-m66 
    Details
    ISSN: 1600-5368
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The title compound, [Sn(C4H9)2(C5H3O2S)2], crystallizes with two molecules in the asymmetric unit, differing just in the orientation of one of the n-butyl groups. The carboxylate groups asymmetrically chelate the Sn atom.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S160053680100126X
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  • 9
    Electronic Resource
    Electronic Resource
    10-[2-(9-Anthryloxy)ethyl]-9-acridone (2001)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 57 (2001), S. o134-o135 
    Details
    ISSN: 1600-5368
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The title compound, C29H21NO2, is an acridone derivative which crystallizes with two almost identical molecules in the asymmetric unit. The angles between the two aromatic planes in the two molecules in the asymmetric unit are 54.22 (3) and 54.04 (3)°.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S1600536801000782
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  • 10
    Electronic Resource
    Electronic Resource
    Dihydridotetrakis(4-picoline-N)silicon dibromide chloroform hexasolvate (2001)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 57 (2001), S. o207-o208 
    Details
    ISSN: 1600-5368
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The title compound, [SiH2(C6H7N)4]Br2·6CHCl3 or C24H30N4Si2+·2Br−·6CHCl3, contains a hexacoordinated Si atom located on a crystallographic centre of inversion. The coordination of the Si atom can be described as a slightly distorted octahedron, with the 4-picoline ligands in the equatorial plane and the two H atoms occupying axial positions. The title compound is isomorphous with its analogue where the Br− ions are substituted by Cl− ions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S1600536801002227
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