Linear Conjugated Systems Bearing Aromatic Terminal Groups. VIII. Syntheses and Electronic Spectra of Bis (4-biphenylyl)-and 2, 2′-Difluorenylpoly-ynes

K Nakasuji, S Akiyama, M Nakagawa

Index: Nakasuji,K. et al. Bulletin of the Chemical Society of Japan, 1972 , vol. 45, p. 883 - 891

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Citation Number: 12

Abstract

In order to get further information on the effect of terminal groups on the spectral regularity of diarylpoly-ynes, we carried out the syntheses of bis (4-biphenylyl) poly-ynes (I n, n= 1–6) and 2, 2′-difluorenylpoly-ynes (II n, n= 1–4 and 6). The bathochromic shift of the longest- wavelength absorption maxima (λ L) along with the increase in n was found to be expressed by the following empirical formulas: I n: λ L= 24.0n 1.1+ 304 (nm in tetrahydrofuran) II n: λ ...