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Organizing Crystalline Functionalized Pentacene Using Periodicity of Poly(Vinyl Alcohol).
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2020-01-07 , DOI: 10.1021/acs.jpclett.9b03373
Rohan J Hudson 1 , Jessica M de la Perrelle 1 , Ryan D Pensack 2 , Bryan Kudisch 2 , Gregory D Scholes 2 , David M Huang 1 , Tak W Kee 1
Affiliation  

Nanoparticles of acenes exhibit highly efficient intermolecular singlet fission (SF). Recent reports indicate that altering the morphology of 6,13-bis-(triisopropylsilylethynyl)pentacene (TIPS-Pn) nanoparticles has a profound influence on their SF dynamics. Here, we show that poly(vinyl alcohol) (PVA) induces a phase transition in preformed TIPS-Pn nanoparticles. These nanoparticles are amorphous when initially formed but crystalline after addition of PVA. Surface characterization indicates that a diffuse PVA layer surrounds the nanoparticles. We propose that a periodic interaction between the hydroxyl groups of PVA and TIPS groups of TIPS-Pn on the nanoparticle surface induces a large-scale structural rearrangement to yield crystalline TIPS-Pn. Such reorganization in preformed organic nanoparticles is unprecedented, and we believe that this is the first report of such an effect induced by polymer adsorption. Transient absorption spectroscopic results reveal that SF within these nanoparticles is accelerated by an order of magnitude upon structural rearrangement.

中文翻译:

使用聚(乙烯醇)的周期性来组织结晶官能化的并五苯。

并烷的纳米颗粒表现出高效的分子间单峰裂变(SF)。最近的报道表明,改变6,13-​​双-(三异丙基甲硅烷基乙炔基)并五苯(TIPS-Pn)纳米粒子的形态对其SF动力学有深远的影响。在这里,我们表明,聚乙烯醇(PVA)会在预先形成的TIPS-Pn纳米颗粒中诱导相变。这些纳米颗粒在最初形成时是非晶态的,但是在添加PVA之后是结晶的。表面表征表明扩散的PVA层围绕纳米颗粒。我们建议在纳米粒子表面上PVA的羟基和TIPS-Pn的TIPS基团之间的周期性相互作用会引起大规模的结构重排,从而产生结晶性的TIPS-Pn。预先形成的有机纳米粒子中的这种重组是前所未有的,并且我们认为这是聚合物吸附引起的这种效应的首次报道。瞬态吸收光谱结果表明,这些纳米颗粒中的SF在结构重排时被加速了一个数量级。
更新日期:2020-01-07
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