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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Simultaneous Photoinduced Color Formation and Photoinitiated Polymerization
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Simultaneous Photoinduced Color Formation and Photoinitiated Polymerization

机译：同时光诱导的颜色形成和光引发的聚合

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摘要

Crystal violet lactone (CVL, 1, 3, 3-bis[4-(dimethylamino)phenyl]-6-(dimethylamino)-1(3H)-isobenzofuranone) and other lactone dye precursors 2-5 form colored triphenylmethyl cations when irradiated with UV light in the presence or absence of [4-(octyloxy)phenyl]phenyliodonium hexafluoroantimonate (OPPI). In selected monomers in the presence of iodonium salt, color formation and polymerization occur simultaneously. The excited singlet state lifetimes of 1-5 estimated from qnantum yields for the disappearance of CVL in the presence of OPPI are similar to those observed for fluorescence quenching and occur mainly by electron transfer. On the basis of the transient absorption spectra, it can be concluded that triarylmethane cations are generated from the lactone precursors in the presence of OPPI in acetonitrile with a pseudo first order rate constant of 10~4 s~(-1). Color formation in the absence of OPPI is suggested to occur from the excited singlet states of the lactone via a biradical formed by photoinduced β-bond cleavage.
机译：结晶紫内酯（CVL，1、3、3-双[4-（二甲基氨基）苯基] -6-（二甲基氨基）-1（3H）-异苯并呋喃酮）和其他内酯染料前体2-5在受辐照时形成有色三苯甲基阳离子在[4-（辛氧基氧基）苯基]苯基碘鎓六氟锑酸盐（OPPI）存在或不存在下的紫外光。在选定的单体中，在存在碘鎓盐的情况下，颜色形成和聚合同时发生。根据在OPPI存在下CVL消失的量子产率估算的1-5的激发单重态寿命为1-5，与荧光猝灭观察到的相似，主要通过电子转移发生。根据瞬态吸收光谱，可以得出结论，在OPPI存在下，内酯前体在乙腈中由内酯前体生成三芳基甲烷阳离子，其伪一级速率常数为10〜4 s〜（-1）。建议在不存在OPPI的情况下通过光诱导的β键断裂形成的双自由基由内酯的激发单重态发生颜色形成。

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