Free Standard AU & NZ Shipping For All Book Orders Over $80!
Register      Login
Australian Journal of Chemistry Australian Journal of Chemistry Society
An international journal for chemical science
RESEARCH ARTICLE

Structural Characterization of a Calix[4]arene Constrained to a 1,3-Alternate Conformation by Polyether Bridging

Z Asfari, JM Harrowfield, AN Sobolev and J Vicens

Australian Journal of Chemistry 47(4) 757 - 762
Published: 1994

Abstract

Despite evidence of coordinative interactions with alkali metal picrates in solution, attempts to crystallize Li+, Na+, K+, Rb+ or Cs+ complexes of a 'doubly crowned' calix [4] arene (obtained by reaction of tetraethylene glycol ditosylate with p-t- butylcalix [4] arene ) have resulted only in the deposition of crystals of the free ligand . A room-temperature single-crystal X-ray study has shown the crystals to be hexagonal, space group P6422, a (= b) 17.092(5), c 20.147(7) Ǻ, V 5097(5) Ǻ3, Z 3, conventional R (on |F|) 0.082 for 1397 'observed' reflections [I > 3σ(I)]. The highly symmetrical oblate-globular shape of this doublecrowncalix allows the enclosure of an extended narrow cavity possibly better suited to the binding of two small metal ions rather than one large.

https://doi.org/10.1071/CH9940757

© CSIRO 1994

Committee on Publication Ethics


Export Citation Get Permission

View Dimensions