ISSN:
1573-1111
Keywords:
crown ether
;
potassium
;
crystal structure
;
2-nitrophenoxide
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Abstract The first crystal structure of a potassium cation complex with dicyclohexano-18-crown-6 is reported. The potassium 2-nitrophenoxide complex ofsyn-cis-syn dicyclohexano-18-crown-6 crystallizes in the triclinic space group P $$\bar 1$$ with cell constantsa=8.604(2),b=10.772(4),C=16.123(5)Å, α=73.86(3)°,β=77.61(3)°, γ=82.68(3)° andZ=2 forD c =1.31 g cm−3. Least-squares refinement based on 2742 observed reflections led to a final conventionalR value of 0.040. Dicyclohexano-18-crown-6 has the shape of a saddle with the potassium cation sitting at the saddlepoint. The structure of the 2-nitrophenoxide anion is dominanted by the quinoid resonance contributor. Because the complex is devoid of significant intercomplex interactions, it is a prototypical 1:1:1 complex.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00665371
