作者:Kunio Oka、Naofumi Fujiue、Saburo Nakanishi、Toshikazu Takata、Robert West、Takaaki Dohmaru
DOI:10.1016/s0022-328x(00)00433-2
日期:2000.10
water-soluble polysilanes take highly entangled form in water. Solvatochromic redshift is induced by THF in aqueous solution of water-soluble polysilanes. This solvatochromism is ascribed to disentanglement the non-polar main chain by non-polar solvent. Another type of solvatochromic shift is also caused by (CF3)2CHOH (HFIP) in non-polar solvent (benzene, CH2Cl2) or even in (CH3)2CHOH solution, where
极性聚硅烷轴承醚侧基的[CH 3 Si(CH 2)米O(CH 2 CH 2 O)Ñ CH 3 } X,米= 3-5和Ñ = 0-3}]制备被发现可溶于多种极性溶剂。UV光谱行为是高度依赖于所用的溶剂的性质,但之间没有简单的关系λ最大和特定的溶剂参数中找到。摩尔吸光度小(ε<10000 /SiSi键)表明水溶性聚硅烷在水中呈高度缠结的形式。溶剂致变色红移是由水溶性聚硅烷水溶液中的THF引起的。这种溶剂致变色归因于通过非极性溶剂使非极性主链解缠。溶剂化变色的另一种类型也由非极性溶剂(苯,CH 2 Cl 2)甚至(CH 3)2中的(CF 3)2 CHOH(HFIP)引起。HFIP浓度较高的CHOH溶液可吸收更长的波长。这种溶剂致变色现象是由醚侧基和HFIP之间形成的强氢键引起的。因为与HFIP有关的氢键具有非解离性质,所以增加侧链部分的体积会导致解缠结。聚硅烷1 - 5,虽然具有长