Determination of End-to-End Distances in a Series of TEMPO Diradicals of up to 2.8 nm Length with a New Four-Pulse Double Electron Electron Resonance Experiment

Rainer E Martin; Matthias Pannier; François Diederich; Volker Gramlich; Michael Hubrich; Hans W Spiess

doi:10.1002/(SICI)1521-3773(19981102)37:20<2833::AID-ANIE2833>3.0.CO;2-7

Determination of End-to-End Distances in a Series of TEMPO Diradicals of up to 2.8 nm Length with a New Four-Pulse Double Electron Electron Resonance Experiment

Angew Chem Int Ed Engl. 1998 Nov 2;37(20):2833-2837. doi: 10.1002/(SICI)1521-3773(19981102)37:20<2833::AID-ANIE2833>3.0.CO;2-7.

Authors

Rainer E Martin¹, Matthias Pannier², François Diederich¹, Volker Gramlich³, Michael Hubrich², Hans W Spiess²

Affiliations

¹ Laboratorium für Organische Chemie, ETH Zentrum, Universitätstrasse 16, CH-8092 Zurich (Switzerland), Fax: (+41) 1-632-1109.
² Max-Planck-Institut für Polymerforschung, Postfach 3148, D-55021 Mainz (Germany), Fax: (+49) 6131-379-100.
³ Laboratorium für Kristallographie, ETH Zentrum, Sonneggstrasse 5, CH-8092 Zürich (Switzerland).

Abstract

A four-pulse version of the pulsed double electron electron resonance (DEER) experiment has been applied to a series of TEMPO diradicals with well-defined interradical distances ranging from 1.4 to 2.8 nm (see picture). The new pulse sequence allows broad distributions of electron-electron distances to be measured without dead-time artifacts.

Keywords: Diradicals; Double electron electron resonance spectroscopy; EPR spectroscopy.