A single-stranded coordination copolymer affords heterostructure observation and photoluminescence intensification
A single-stranded coordination copolymer affords heterostructure observation and photoluminescence intensification
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DOI：
10.1126/sciadv.aau0637
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发表时间：
2019-01
期刊：
影响因子：
13.6
通讯作者：
Ryojun Toyoda;R. Sakamoto;N. Fukui;Ryota Matsuoka;M. Tsuchiya;H. Nishihara
中科院分区：
文献类型：
--
作者：
Ryojun Toyoda;R. Sakamoto;N. Fukui;Ryota Matsuoka;M. Tsuchiya;H. Nishihara
一个单链的配位共聚物进行共聚物结构可视化环境原子力显微镜和光致发光增强。很少有人工系统可以剥离成，并观察到，长度超过几微米的单线，并且没有以前的例子具有共聚物结构;这与单链DNA等生物聚合物形成对比。在这里，我们创建了一套一维的配位共聚物，具有双（dipyrrinato）锌配合物图案的主链。以两种不同的桥联二吡咯啉前配体和醋酸锌为原料，通过改变前配体之间的摩尔比，合成了一系列无规共聚物。在有机溶剂中对本体固体共聚物进行超声处理，剥离长度为1.4至3.0 μm的单链。原子力显微镜在环境条件下可视化的共聚物结构的高度分布。该共聚物结构相对于相应的均聚物（3和10%）改善了其光致发光（高达32%）。基于限制性随机游走模型的数值模拟再现了光致发光的增强，同时表明存在快速的线内激子跳跃。
A single-stranded coordination copolymer is subject to copolymer structure visualization by ambient AFM and photoluminescence enhancement. Few artificial systems can be exfoliated into, and observed as, single wires with lengths of more than several micrometers, and no previous example features a copolymer structure; this is in contrast with biopolymers such as single-strand DNAs. Here, we create a set of one-dimensional coordination copolymers featuring bis(dipyrrinato)zinc complex motifs in the main chain. A series of random copolymers is synthesized from two types of bridging dipyrrin proligand and zinc acetate, with various molar ratios between the proligands. Sonication of the bulk solid copolymer in organic solvent exfoliates single strands with lengths of 1.4 to 3.0 μm. Atomic force microscopy at ambient conditions visualizes the copolymer structure as height distributions. The copolymer structure improves its photoluminescence (up to 32%) relative to that of the corresponding homopolymers (3 and 10%). Numerical simulation based on a restricted random walk model reproduces the photoluminescence intensification, suggesting at the same time the existence of fast intrawire exciton hopping.