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首页> 外文期刊>RSC Advances >Molecular packing, crystal to crystal transformation, electron transfer behaviour, and photochromic and fluorescent properties of three hydrogen-bonded supramolecular complexes containing benzenecarboxylate donors and viologen acceptors
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Molecular packing, crystal to crystal transformation, electron transfer behaviour, and photochromic and fluorescent properties of three hydrogen-bonded supramolecular complexes containing benzenecarboxylate donors and viologen acceptors

机译：三种包含苯甲酸供体和紫精受体的氢键超分子配合物的分子堆积，晶体到晶体的转变，电子转移行为以及光致变色和荧光性质

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摘要

An investigation into the relationship between structures of three D-A supramolecular systems and their photoresponsive characteristics is presented. Compound 1 [H2CPBPY]center dot[H2BTEC] and compound 2 [HCPBPY](2)center dot[H2BTEC]center dot 5H(2)O are prepared with the same starting materials at different pH values and characterized by single crystal X-ray diffraction, powder X-ray diffraction, UV-vis, IR and ESR spectra. Electron-deficient CPBPY moieties and electron-donating BTEC units are linked by hydrogen-bonds and p-p stacking interactions to form the donor-acceptor systems. Under light irradiation, photoactivated electrons can transfer from the donor to the acceptor units in both 1 and 2, giving rise to a long-lived charge-separated state and accompanying an interesting color changing phenomenon. Crystals of 2 allowed to dehydrate at elevated temperature undergo single-crystal to single-crystal transformation to yield 3 [HCPBPY](2)center dot[H2BTEC], accompanied by a drastic change in structural arrangements. For the photocoloration character, compound 1 shows a faster photoresponsive rate than 2 and 3. For the fluorescence properties, compound 1 and 2 both exhibit photoluminescence emission centered at 400 nm, whereas 3 exhibits photoluminescence emission at 520 nm, showing a significant red shift of 120 nm. Their different photoactive characters can be attributed to the connecting, packing modes and the valence states of the functional D-A moieties.
机译：研究了三个D-A超分子系统的结构与其光响应特性之间的关系。用相同的原料在不同的pH值下制备化合物1 [H2CPBPY]中心点[H2BTEC]和化合物2 [HCPBPY]（2）中心点[H2BTEC]中心点5H（2）O，并用单晶X射线表征衍射，粉末X射线衍射，UV-vis，IR和ESR光谱。缺电子的CPBPY部分和给电子的BTEC单元通过氢键和p-p堆积相互作用连接在一起，形成供体-受体系统。在光照射下，光活化电子可以同时从1和2中的供体转移到受体单元，从而产生长寿命的电荷分离状态，并伴随着有趣的变色现象。允许在高温下脱水的2晶体经历单晶至单晶转变，从而产生3 [HCPBPY]（2）中心点[H2BTEC]，伴随着结构排列的巨大变化。对于光致变色特性，化合物1显示出比2和3更快的光响应速率。对于荧光特性，化合物1和2均显示出以400 nm为中心的光致发光发射，而化合物3和3则在520 nm处显示出光致发光发射，显示出显着的红移。 120纳米它们不同的光敏特性可归因于功能性D-A部分的连接，堆积模式和价态。

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