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.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
