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  • trimethylaluminum  (3)
  • CDCl3 guest  (1)
  • 1
    Digitale Medien
    Digitale Medien
    Reaction of trimethylaluminum with crown ethers. II. The synthesis and crystal structure of (Dibenzo-18-crown-6)tris(trimethylaluminum) and of (18-crown-6)tetrakis(trimethylaluminum) (1983)
    Springer
    Journal of inclusion phenomena and macrocyclic chemistry 1 (1983), S. 61-69 
    Details
    ISSN: 1573-1111
    Schlagwort(e): Crown ethers ; trimethylaluminum ; crystal structure
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract Both title compounds were prepared by adding AlMe3 to a suspension of the appropriate crown ether in toluene, followed by reaction in a sealed tube. Both products were obtained in the form of extremely air-sensitive, colorless crystals. [AlMe3]3[dibenzo-18-crown-6] crystallizes in space group PĪ, witha=8.898(4),b=11.848(5),c=19.060(6) Å, α=74.86(3), β=80.73(4), and γ=67.02(4)°. Refinement led to a final conventional weightedR value of 0.052 for 1800 reflections. [AlMe3]4[18-crown-6] belongs to space group Pbcn, witha=18.753(3),b=12.570(6), andc=15.095(6) Å. Refinement was taken toR w =0.064 for 1320 reflections.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00658016
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  • 2
    Digitale Medien
    Digitale Medien
    Preparation and structure of (calix[8]arene methyl ether) · 2CDCl3 (1986)
    Springer
    Journal of inclusion phenomena and macrocyclic chemistry 4 (1986), S. 247-253 
    Details
    ISSN: 1573-1111
    Schlagwort(e): calix[8]arene ; crystal structure ; CDCl3 guest
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract The methyl ether of calix[8]arene crystallizes from CDCl3 with two molecules of the solvent per molecule of host. An X-ray structural investigation has shown that the CDCl3 guests exist within the calixarene framework. The complex resides on a crystallographic center of inversion, and the cavity is roughly circular in projection as measured by the distance between centroids of aromatic rings related by the center: 14.5, 13.9, 10.1, and 11.2 Å. Six of the oxygen atoms are found on the inside and two on the outside. Crystals belong to the triclinic space group $$P\bar 1$$ witha=11.741(9),b=11.810(9),c=12.484(8) Å, α=94.74(8), β=104.41(8), γ=111.30(9)°, andD c =1.31 g cm−3 forZ=1. Refinement led to a finalR value of 0.086 for 949 observed reflections.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00657998
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  • 3
    Digitale Medien
    Digitale Medien
    Behavior of M[Al2Me6N3] (M=K, Rb, Cs) with aromatic solvents and the crystal structures of Cs[Al2Me6N3]·2p-xylene and [K·dibenzo-18-crown-6] [Al2Me6N3]· 1.5(1-methylnaphthalene) (1985)
    Springer
    Journal of inclusion phenomena and macrocyclic chemistry 3 (1985), S. 113-123 
    Details
    ISSN: 1573-1111
    Schlagwort(e): Aromatic...cation interactions ; crown ethers ; liquid clathate ; trimethylaluminum ; crystal structure
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract The title compounds were synthesized by the addition of AlMe3 to the corresponding azide suspended in an aromatic solvent. Both products were obtained as air-sensitive colorless crystals. Cs[Al2Me6N3]·2p-xylene crystallizes in the monoclinic space groupC2/m witha=19.143(6),b=16.227(6),c=10.392(5) Å, β=114.06(2)o, and ρcalc = 1.20 g cm−3 forZ=4. Refinement led to a conventionalR value of 0.037 for 2179 observed reflections. The cesium atom resides on a mirror plane, and the anion is disordered about a twofold axis. Thep-xylene molecules sandwich the cesium ion. [K·dibenzo-18-crown-6] [AlMe6N3]·1.5(1-methylnaphthalene) crystallizes in the monoclinic space groupP21/c witha=14.176(5),b=13.021(5),c=25.324(8) Å, β=98.23(4)0, and ρcalc = 1.08 g cm−3 forZ=4. The finalR value was 0.132 for 1402 observed reflections. One of the 1-methylnaphthalene molecules is disordered about a center of inversion and interacts with the potassium ion. The other solvent molecule is found roughly in layers in the lattice and also exhibits disorder of the methyl substituent. For both title compounds the AlMe3 groups of the anion exhibit a staggered (C s) conformation.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00687984
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  • 4
    Digitale Medien
    Digitale Medien
    Reaction of trimethylaluminum with crown ethers. III. The synthesis and crystal structure of (12-crown-4)bis(trimethylaluminum) (1985)
    Springer
    Journal of inclusion phenomena and macrocyclic chemistry 3 (1985), S. 65-69 
    Details
    ISSN: 1573-1111
    Schlagwort(e): crown ether ; trimethylaluminum ; crystal structure
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract The crown ether 12-crown-4 reacts with trimethylaluminum in toluene to form the complex [AlMe3]2[12-crown-4]. Attempts to utilize the remaining two oxygen atoms for coordination to AlMe3 molecules were unsuccessful. The 2∶1 complex crystallizes in the monoclinic space groupP21/n witha=11.342(7),b=12.941(4),c=6.973(6) Å, and β=95.48(4)°. Refinement led to a finalR value of 0.047 for 925 observed reflections. The molecule resides on a crystallographic center of inversion, and as required by symmetry, the four oxygen atoms are planar. The Al−O bond is strong as revealed by the bond length of 1.977(3) Å.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00658863
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