Room-Temperature Electron Spin Relaxation of Triarylmethyl Radicals at the X- and Q-Bands.

ABSTRACT: Triarylmethyl radicals (trityls, TAMs) represent a relatively new class of spin labels. The long relaxation of trityls at room temperature in liquid solutions makes them a promising alternative for traditional nitroxides. In this work we have synthesized a series of TAMs including perdeuterated Finland trityl (D36 form), mono-, di-, and triester derivatives of Finland-D36 trityl, the deuterated form of OX63, the dodeca-n-butyl homologue of Finland trityl, and triamide derivatives of Finland trityl with primary and secondary amines attached. We have studied room-temperature relaxation properties of these TAMs in liquids using pulsed electron paramagnetic resonance (EPR) at two microwave frequency bands. We have found the clear dependence of phase memory time (Tm ∼ T2) on the magnetic field:

SUBMITTER: Kuzhelev AA 

PROVIDER: S-EPMC4830422 | biostudies-literature | 2015 Oct

REPOSITORIES: biostudies-literature