In order to study the polymer effect in the photoreduction of viologen-containing polymers by 2-propanol, bisviologen compounds, V2+–(CH2)n–V2+, were subjected to photoreduction. The rates of photoreduction occur in the order n=2>3>4>5>MV2+. The structure of the photoreduced species was found to be predominantly the doubly reduced species, V+–(CH2)n–V+, in the cases of n=2 and 3, and mixtures of the doubly reduced and singly reduced species, V+–(CH2)n–V2+, in the cases of n=4 and 5. Intramolecular dimeric association of V+ units was observed for all the compounds except for n=2, where the intramolecular association was structurally inhibited. The variation of rate and structure distribution of reduced species was interpreted in terms of the local concentration effect in the photoreduction step.
为了研究2-
丙醇在含有紫荆花紫
染料聚合物的光还原中的聚合物效应,双紫荆花化合物V2+–(
CH2)n–V2+被 subjected to photoreduction。光还原速率的顺序为 n=2>3>4>5>MV2+。对于 n=2 和 3 的情况,光还原物种的结构主要为双还原物种 V+–( )n–V+,而对于 n=4 和 5 的情况,则为双还原物种和单还原物种 V+–( )n–V2+ 的混合物。除了 n=2 外,所有化合物都观察到了 V+ 单元的分子内二聚体结合,而 n=2 的情况下则因结构限制抑制了分子内结合。还原物种的速率和结构分布变化被解释为光还原步骤中的局部浓度效应。