1,3-Alternate calix[4]arene nitronyl nitroxide tetraradical and diradical: synthesis, X-ray crystallography, paramagnetic NMR spectroscopy, EPR spectroscopy, and magnetic studies

Authors

• Andrzej Rajca, University of Nebraska - LincolnFollow
• Maren Pink, Indiana University
• Sumit Mukherjee, University of Nebraska - Lincoln
• Suchada Rajca, University of Nebraska-LincolnFollow
• Kausik Das, University of Nebraska - Lincoln

Document Type

Article

Date of this Version

October 2007

Comments

Published in Tetrahedron 63:44, (October 29, 2007), pp. 10731–10742; doi:10.1016/j.tet.2007.07.051 Copyright © 2007 Elsevier Ltd. Used by permission. http://www.sciencedirect.com/science/journal/00404020

Abstract

Calix[4]arenes constrained to 1,3-alternate conformation and functionalized at the upper rim with four and two nitronyl nitroxides have been synthesized, and characterized by X-ray crystallography, magnetic resonance (EPR and ¹H NMR) spectroscopy, and magnetic studies. Such calix[4]arene tetraradicals and diradicals provide scaffolds for throughbond and through-space intramolecular exchange couplings.

Includes Supplemental Data (27 pages).