Canadian journal of chemistry

Intramolecular excimer fluorescence from folded ground state rotamers of N, N'dimethyl-N, N'-dipyrenylurea protophanes

FD Lewis, TL Kurth

Index: Lewis, Frederick D.; Kurth, Todd L. Canadian Journal of Chemistry, 2003 , vol. 81, # 6 p. 770 - 776

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Citation Number: 17

Abstract

The molecular structure, absorption, and fluorescence spectra of N, N'-dimethyl-N, N'-di-1- pyrenylurea and N, N'-dimethyl-N, N'-di-2-pyrenylurea have been investigated and compared to the properties of N, N, N'-trimethyl-N'-pyrenylurea model compounds. Di-1- pyrenylurea exists as a mixture of folded (E, E) syn-and anti-rotamers that interconvert via flipping of one of the pyrene rings to an unfolded (E, Z) rotamer geometry. The symmetric ...