Abstract
14N NQR spectra at 77 K for seven organic dye cations and one free base are reported. The cations are weakly paramagnetic at 77 K, exhibiting broad and featureless EPR spectra characteristic of weak charge-transfer complexes. The positive charge in the cations is largely delocalized. The existence of a simple relationship between the 14N NQR data and optical properties for three cyanine laser dyes is discussed.
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