title: Design and characterization of a calixarene inclusion compound for calibration of long-range carbon-fluorine distance measurements by solid-state NMR.
abstract: An inexpensive, easily synthesized calixarene:fluorotoluene host:guest inclusion complex has been designed for optimization and calibration of solid-state NMR measurements of carbon-fluorine distances using Rotational Echo DOuble Resonance (REDOR). Complexation of the fluorotoluene with the calixarene host separates the molecules such that simple two-spin behavior is observed for one site with a 4.08 Å carbon-fluorine distance. Fluorotoluene dynamics within the calixarene matrix cause motional averaging of the dipolar couplings, which makes it possible to easily optimize REDOR experiments and test their accuracy for relatively long distance measurements (>6.6 Å). This provides a new tool for accurate REDOR measurements of long carbon-fluorine distances, which have important applications in the characterization of fluorine-containing drugs, proteins, and polymers.
authors.affiliation: Department of Chemistry, University of Massachusetts Amherst. 710 N. Pleasant St., Amherst, MA 01003, USA.
authors.forename: Daniel J
authors.initials: DJ
authors.lastname: Fowler
authors.forename: Peter G
authors.initials: PG
authors.lastname: Khalifah
authors.forename: Lynmarie K
authors.initials: LK
authors.lastname: Thompson
mesh_terms: D002138:Calibration; D047250:Calixarenes / Q000138:chemical synthesis / Q000737:chemistry*; D002244:Carbon / Q000737:chemistry*; D005461:Fluorine / Q000737:chemistry*; D007202:Indicators and Reagents; D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D008958:Models, Molecular
chemical_list: D007202:Indicators and Reagents; D047250:Calixarenes; D005461:Fluorine; D002244:Carbon
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