Abstract

Sublimation ofp-iso-propylcalix[4]arene (form IP) under reduced pressure results in the concomitant formation of two new polymorphs (forms IIPand IIIP).

Highlights

  • The fascinating solid-state inclusion properties of tBc prompted further studies aimed at tailoring the void space in Scheme 1 (a) The molecular structure of p-iso-propylcalixij4]arene, (b) iPc shown in space filling representation and (c) iPc shown as a cone

  • Sublimation growth resulted in the formation of crystals with two distinct morphologies (Fig. 2) and single-crystal X-ray diffraction analysis confirmed that these are concomitant polymorphs

  • We have described the concomitant isolation and characterisation of two new polymorphs (IIP and IIIP) of iPc grown by sublimation

Read more

Summary

Introduction

The fascinating solid-state inclusion properties of tBc prompted further studies aimed at tailoring the void space in Scheme 1 (a) The molecular structure of p-iso-propylcalixij4]arene (iPc), (b) iPc shown in space filling representation and (c) iPc shown as a cone (iso-propyl groups are shown as spheres lining the upper rim). It appears that the host packing arrangement observed for IIB is highly sensitive to even slight addition of bulk to the upper rim of the calixarene.. The present work was motivated by the observation (based on a search of the Cambridge Structural Database) that p-isopropylcalixij4]arene (iPc, Scheme 1) exhibits host packing arrangements with a variety of guests that are highly reminiscent of that of tBc with the same guests.. It was hoped that, under the same crystal growth conditions, a slightly less bulky group on the upper rim would produce an apohost form that is isostructural to IIB, but with slightly more void space The present work was motivated by the observation (based on a search of the Cambridge Structural Database) that p-isopropylcalixij4]arene (iPc, Scheme 1) exhibits host packing arrangements with a variety of guests that are highly reminiscent of that of tBc with the same guests. It was hoped that, under the same crystal growth conditions, a slightly less bulky group on the upper rim would produce an apohost form that is isostructural to IIB, but with slightly more void space

Objectives
Results
Conclusion
Full Text
Paper version not known

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 call

Disclaimer: 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.