Amino-substituted distyrylbenzene

Figure 3.73. Volume size of voxels assuming ellipsoid structure as a function of the inverse of the scan speed. The voxels were obtained by TP initiated crosslinking radical polymerization of acrylates in the presence of poly (styrene-co-acrylonitrile) as binder and an amino-substituted distyrylbenzene as TP active initiator using a pulsed laser (150-fs pulses at a 76-MHz repetition rate or 85-fs pulses at a repetition rate of 82 MHz). (From Ref. [133] with permission of the Technical Association of Photopolymers, Japan.)...

A photonic crystal-type stack of logs was obtained by TP initiated cross-linking radical polymerization of acrylates in the presence of poly(styrene-co-acrylonitrile) as binder and an amino substituted distyrylbenzene (58) as two-photon active initiator (Fig. 3.93) [133]. This photonic crystal-type microstructure has an average periodicity of 1 pm, a base area of 60 pm x 60 pm, and a height of 8 pm. The lines are about 200 nm wide, which is considerably smaller than the fabrication wavelength (Fig. 3.93) [133]. 

Distyrylbenzenes with the general structure 58 have become one of the most widely used compounds for applications in TP photosciences. The TPA of these chromophores is higher compared to that of donor substituted polyenes 57. Thus, the (phenylene-vinylene) moiety is presumably a better re-bridge to increase 8 compared to the diphenylpolyene in 57. Increase of the re-bridge in 58 has an impact on Moi and M12, respectively, resulting in an increase of 8 because for such chromophores 8 is proportional to (Moi M12)2, Eq. (27). Furthermore, substitution of stilbene and distyrylbenzene by amino groups at the chromophore ends results in a three- to fourfold increase of M12 while... 

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See also in sourсe #XX -- [ , ]

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