ISSN:
1573-1111
Keywords:
Dibenzo-18-crown-6
;
acetonitrile
;
nitromethane
;
solvent complex
;
low temperature crystal structure
;
C−H acidic hydrogen interactions
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Abstract Complete structural characterization of dibenzo-18-crown-6·2 CH3NO2 and dibenzo-18-crown-6·2 CH3CN have been carried out, including location and refinement of the methyl hydrogen atoms. Dibenzo-18-crown-6·2 CH3NO2 is monoclinic,P21/c, with (at −150°C)a=9.573(2),b=14.636(2),c=33.471(7) Å, β=93.77(2)°, andD calc=1.37 g cm−3 forZ=8. Interactions between the solvent methyl groups and the crown ethers and other solvent nitro groups associate the 1 : 2 complexes into polymeric chains alongb. The acetonitrile adduct exists as discreet 1 : 2 complexes in the solid state with C−H...O interactions exlusively to the ether. This complex is triclinic,P 1, with (at −150°C)a=9.458(6),b=9.570(5),c=14.404(5) Å, α=73.18(4), β=79.85(5), γ=66.82(6)°, andD calc=1.28 g cm−3 forZ=2.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00656345
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