Phenalenyls, Cyclopentadienyls, and Other Carbon-Centered Radicals - Stable Radicals: Fundamentals and Applied Aspects of Odd-Electron Compounds - page 129

(a) (b)

(c) (d)

Figure 3.52 (a) Resonance structures and calculated singlet biradical character of Ph 2 - BPLE ; (b) resonance
structures of Ph 2 - BPLE • + ; (c) crystal structure of Ph 2 - BPLE -F 4 -TCNQ CT complex at room temperature; and
(d)overlappatternofPh 2 - BPLE • + moieties.(c,dReproducedwithpermissionfrom[74d].CopyrightWiley-VCH
VerlagGmbH&Co.KGaA.)

Figure 3.53 One-photon absorption spectrum (black solid line, left) and two-photon absorption spectrum
(circle,right)ofPh 2 - IDPL intrichlormethane.