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First hyperpolarizabilities of hexa(ethynyl)benzene derivatives: effect of conjugation length
Piao, Ming Jun,Chajara, Khalil,Yoon, Soo Jung,Kim, Hwan Myung,Jeon, Seung-Joon,Kim, Tae-Hyun,Song, Kai,Asselberghs, Inge,Persoons, André,Clays, Koen,Cho, Bong Rae Royal Society of Chemistry 2006 Journal of materials chemistry Vol.16 No.23
<P>A variety of dipolar and octupolar molecules containing C&z.tbd;C bonds as the conjugation bridge have been synthesized and the linear and nonlinear optical properties (<I>β</I>) were studied. The <I>β(0)</I> value of the dipole increases with conjugation length, whereas that of the octupole decreases from 2a to 2b with concomitant decrease in <I>λ</I><SUB>max</SUB>. A further increase in the conjugation length to 3a–c increased <I>β(0)</I> because of the larger oscillator strength. Moreover, 3a with the most distorted structure shows the largest <I>β(0)</I>, probably because of the dipolar contribution. On the other hand, <I>β<SUB>yyy</SUB></I>/<I>β<SUB>zzz</SUB></I> ratios are smaller than unity, probably because <I>β<SUB>zzz</SUB></I> is overestimated by the errors involved in the resonance correction.</P> <P>Graphic Abstract</P><P>Hexa(ethynyl)benzene derivatives have been synthesized and shown to exhibit a large first hyperpolarizability in the range of <I>β(0)</I> = (90–192) × 10<SUP>−30</SUP> esu; values which are among the largest found in the octupolar molecules measured by the frequency-resolved HRS experiments. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=b601982j'> </P>
Cho, Bong-Rae,Kim, Young-Hoon,Son, Kyung-Wha,Khalil, Chajara,Kim, Yong-Ho,Jeon, Seung-Joon Korean Chemical Society 2002 Bulletin of the Korean Chemical Society Vol.23 No.9
1,3,5-Tricyano-2,4,6-tris[2-(thiophen-2-yl)vinyl]benzene derivatives have been synthesized as a new type of octupolar nonlinear optical molecules and their linear and nonlinear optical properties were determined. The λmax values increa sed with the conjugation length and as the conjugation bridge was changed from phenyl to thienyl group. For phenyl and thiophene derivatives, the b value increased with conjugation length. In contrast, the $\beta$ values of the thiophene derivatives were much smaller than the corresponding phenyl derivatives.