Singlet–triplet energy gap in a cyclophane-basedorganic diradical with parallel exchange coupling pathways

Andrzej Rajca; Suchada Rajca; Jirawat Wongsriratanakul

doi:10.1039/B001273O

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Singlet–triplet energy gap in a cyclophane-based organic diradical with parallel exchange coupling pathwaysElectronic supplementary information (ESI) available: synthesis and characterisation data for 4; minimum conformation for diradical 1. See http://www.rsc.org/suppdata/cc/b0/b001273o/

Andrzej Rajca,*^a Suchada Rajca^a and Jirawat Wongsriratanakul^a

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^a Department of Chemistry, University of Nebraska, Lincoln, NE, USA.
E-mail: arajca1@unl.edu

Abstract

The novel cyclophane diradical 1 possesses a singlet ground state with a singlet–triplet energy gap (ΔE_ST) of −0.20 and −0.24 kcal mol⁻¹, as measured with SQUID magnetometry and EPR spectroscopy, respectively. This large ΔE_ST may in part be associated with the two parallel 3,3′-biphenyl exchange coupling pathways (ECPs).

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Article information

DOI: https://doi.org/10.1039/B001273O
Article type: Communication
Submitted: 09 Feb 2000
Accepted: 20 Apr 2000
First published: 23 May 2000

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Chem. Commun., 2000, 1021-1022

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Singlet–triplet energy gap in a cyclophane-based organic diradical with parallel exchange coupling pathways

A. Rajca, S. Rajca and J. Wongsriratanakul, Chem. Commun., 2000, 1021 DOI: 10.1039/B001273O

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