Linear Conjugated Systems Bearing Aromatic Terminal Groups. III. The Synthesis and the Electronic Spectra of 1,1′-Dinaphthyl- and 2,2′-Dinaphthylpoly-ynes
作者:Kazuhiro Nakasuji、Shuzo Akiyama、Kazuko Akashi、Masazumi Nakagawa
DOI:10.1246/bcsj.43.3567
日期:1970.11
1,1′-Dinaphthylpoly-ynes (In, n=1–6) and 2,2′-dinaphthylpoly-ynes (IIn, n=1–6) were synthesized, and their electronic spectra were measured. The In-series gave an excellent agreement with the λmax∝n1.5 relationship, and the IIn-series followed a straight line, λmax∝n1.3. These relationships are different from those of 1,1′-dianthryl- and 9,9′-dianthrylpory-ynes, in which the plots of λmax versus n2 give excellent straight lines (Bull. Chem. Soc. Jap., 39, 2320 (1966); 40, 340 (1967)). The new linear relationships found in the dinaphthyl-series offer further evidence of the prominent effect of the terminal groups upon the electronic spectral properties of the conjugated poly-yne system.
合成了1,1′-二萘基多炔(In,n=1–6)和2,2′-二萘基多炔(IIn,n=1–6),并测量了它们的电子光谱。In系列的λmax与n1.5的关系非常吻合,而IIn系列则遵循直线关系,即λmax与n1.3成正比。这些关系与1,1′-二蒽基和9,9′-二蒽基多炔的情况不同,后者λmax与n^2的关系图呈现出非常好的直线(Bull. Chem. Soc. Jap., 39, 2320 (1966); 40, 340 (1967))。在二萘基系列中发现的新线性关系进一步证明了端基对共轭多炔体系电子光谱特性的显著影响。