Rigid Orthogonal Bis-TEMPO Biradicals with Improved Solubility for Dynamic Nuclear Polarization
作者:Eric L. Dane、Björn Corzilius、Egon Rizzato、Pierre Stocker、Thorsten Maly、Albert A. Smith、Robert G. Griffin、Olivier Ouari、Paul Tordo、Timothy M. Swager
DOI:10.1021/jo202349j
日期:2012.2.17
The synthesis and characterization of oxidized bis-thioketal-trispiro dinitroxide biradicals that orient the nitroxides in a rigid, approximately orthogonal geometry are reported. The biradicals show better performance as polarizing agents in dynamic nuclear polarization (DNP) NMR experiments as compared to biradicals lacking the constrained geometry. In addition, the biradicals display improved solubility