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  • 1
    Electronic Resource
    Electronic Resource
    Crystal structures of the hydrated disodium and paraquat salts of 1,8-disulfonato-3,4,5,6-acridinetetracarboxylic acid (1998)
    Springer
    Journal of chemical crystallography 28 (1998), S. 39-46 
    Details
    ISSN: 1572-8854
    Keywords: Crystal structure ; 1,8-disulfonato-3,4,5,6-acridinetetracarboxylic acid ; 3,4,5,6-tetracarboxyacridine-1,8-disulfonate ; paraquat ; hydrate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Two hydrated salts of 1,8-disulfonato-3,4,5,6-acridinetetracarboxylic acid, H2L, have been characterized by single-crystal X-ray analysis. Compound 1, Na2L·9 $$ - \frac{1}{2}$$ H2O, crystallizes in the monoclinic space group C2/c with a = 42.005(1), b = 6.838(1), c = 23.807 (1) Å, β = 122.71 (1)°, and Z = 8. Compound 2, (paraquat)L·2H2O, belongs to the triclinic space group $${P\bar 1}$$ with a = 9.940(1), b = 11.543(1), c = 14.033(1) Å, α = 105.45(1), β = 95.82(1), γ = 100.14(1)° and and Z = 2. All four carboxyl groups in the 3,4,5,6-tetracarboxyacridine-1,8-disulfonate dianion L2− are un-ionized. In 1 the distorted octahedrally coordinated sodium cations, the anions, and the lattice water molecules are joined together by hydrogen bonds to generate a three-dimensional network. In the crystal structure of 2, a host framework composed of L2− ions and water molecules accommodate the paraquat dications within two channel systems running parallel to the a and b axes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1021726618789
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  • 2
    Electronic Resource
    Electronic Resource
    Synthesis and crystal structure of a polymeric erbium(III)–sodium(I) coordination complex of picolinic acid N-oxide (1998)
    Springer
    Journal of chemical crystallography 28 (1998), S. 413-418 
    Details
    ISSN: 1572-8854
    Keywords: Crystal structure ; coordination polymer ; erbium(III)–sodium(I) carboxylate complex ; picolinic acid N-oxide
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract A new Er(III)–Na(I) coordination polymer of stoichiometry [NaEr2L5(H2O)6(NO3)](NO3)·3.5H2O (HL = picolinic acid N-oxide) has been synthesized and characterized by single-crystal X-ray analysis. Crystals are triclinic, PĪ with a = 9.823(2), b = 12.453(2), c = 20.643(4) Å; α = 98.49(3), (β = 101.40(3), γ = 108.69(3)°; V = 2284(1) Å3; Z = 2. Of the two independent eight-coordinate erbium(III) ions in this complex, one is surrounded by four bidentate chelating L ligands, and the other by one bidentate chelating L ligand, four aqua ligands and two anti-carboxylate oxygen atoms from two neighboring [ErL4] units. The sodium(I) ion is in a distorted octahedral environment, being coordinated by a unidentate nitrate anion, three aqua ligands and two anti-carboxylate oxygen atoms from two adjacent [ErL4] units. The complex is built from zigzag chains of syn-anti carboxylate-bridged erbium(III) moieties directed in the a direction, which are cross-linked pairwise by aqua-bridgeddimericsodium(I) units. The resulting composite polymeric chains are further connected by hydrogen bonds to form a three-dimensional network.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022424511580
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  • 3
    Electronic Resource
    Electronic Resource
    Crystal structure of tetraethylammonium fluoride-water (4/11), 4(C2H5)4N+F− · 11H2O, a clathrate hydrate containing linear chains of edge-sharing (H2O)4F− tetrahedra and bridging water molecules (1985)
    Springer
    Journal of inclusion phenomena and macrocyclic chemistry 3 (1985), S. 347-354 
    Details
    ISSN: 1573-1111
    Keywords: Crystal structure ; clathrate hydrate ; hydrogen bonding ; tetraethylammonium fluoride
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Crystals of 4(C2H5)4N+F− · 11H2O are orthorhombic, space groupPna21, witha=16.130(3),b=16.949(7),c=17.493(7) Å, andZ=4. The structure was shown to be a clathrate hydrate containing infinite chains of edge-sharing (H2O)4F− tetrahedra extending parallel to thea axis. The chains are laterally linked by bridging water molecules to form a three-dimensional hydrogen-bonded anion/water framework. The ordered (C2H5)4N+ cations occupy the voids in two open channel systems running in theb andc directions. FinalR F =0.091 for 2278 observed MoK α data measured at 22°C.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00655735
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  • 4
    Electronic Resource
    Electronic Resource
    Tetraethylammonium acetate tetrahydrate, (C2H5)4N+ CH3COO− · 4H2O, a layer structure with cations sandwiched between nets of puckered polygons formed by hydrogen-bonded anions and water molecules (1986)
    Springer
    Journal of inclusion phenomena and macrocyclic chemistry 4 (1986), S. 273-280 
    Details
    ISSN: 1573-1111
    Keywords: Crystal structure ; layer structure ; hydrate ; hydrogen bonding ; tetraethylammonium acetate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Crystals of (C2H5)4N+ CH3COOO− · 4H2O crystallize in space groupP ī, witha=12.327(2),b=17.196(6),c=8.753(3) Å, α=94.28(2), β=91.09(2), γ=120.30(2)°, andZ=4. The structure was solved by direct methods and refined toR F -0.060 for 4803 MoKα data. In the crystal structure, ordered (C2H5)4N+ cations are sandwiched between puckered layers of hydrogen-bonded water molecules and acetate anions. Each wateranion layer is constructed from an edge-sharing assembly of six independent, irregular, and non-planar polygons (two nonagons, two hexagons and two pentagons). All protons in the scheme of hydrogen bonding are uniquely located.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00658001
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  • 5
    Electronic Resource
    Electronic Resource
    Tetraethylammonium chloride tetrahydrate, a ‘double channel’ host lattice constructed from (H2O)4Cl− tetrahedra linked between vertices (1986)
    Springer
    Journal of inclusion phenomena and macrocyclic chemistry 4 (1986), S. 295-302 
    Details
    ISSN: 1573-1111
    Keywords: Crystal structure ; channel structure ; hydrogen bonding ; tetraethylammonium chloride tetrahydrate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Crystals of (C2H5)4NCl·4H2O are orthorhombic, space groupCcca, witha=19.104(3),b=23.084(4),c=13.330(3) Å, andZ=16. The structure features an anionic host lattice constructed from the linkage of (H2O)4Cl− tetrahedra by hydrogen bonds between vertices, generating two open linear channel systems which accommodate the ordered cations. FinalR F =0.080 for 1516 observed MoKα data measured at 22°C.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00658004
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