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光敏剂[Ru(bpy)]的还原猝灭揭示了用于光驱动氧化还原催化的PAN聚合物纳米纤维中位点的不均匀分布。

Reductive quenching of photosensitizer [Ru(bpy)] reveals the inhomogeneous distribution of sites in PAN polymer nanofibers for light-driven redox catalysis.

作者信息

Stepping Svea M, Vashistha Nikita, Ullah Sana, Liu Poting, Anjass Montaha, Dietzek-Ivanšić Benjamin

机构信息

Institute of Physical Chemistry, Friedrich-Schiller-University Jena Helmholtzweg 4 07743 Jena Germany

Department of Chemistry-Ångström, Physical Chemistry, Uppsala University 75120 Uppsala Sweden.

出版信息

RSC Adv. 2024 Oct 15;14(44):32501-32505. doi: 10.1039/d4ra05672h. eCollection 2024 Oct 9.

DOI:10.1039/d4ra05672h
PMID:39411257
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11474860/
Abstract

Integration of molecular photocatalysts into redox-inert polymers constitutes a path towards photocatalytically active, lightweight materials. In particular, electrospun polymer fibers hold potential due to their favorable surface-to-volume ratio and their straightforward fabrication. This study focuses on the polyacrylonitrile (PAN) fibers, into which the prototype photosensitizer (PS) ruthenium tris(bipyridine) [Ru(bpy)], has been embedded by electrospinning. Studying the interaction between the optically excited [Ru(bpy)] with a non-redox inert solvent within the nanofibers, we resolve a distribution of microenvironments, which differ by the extent to which the photosensitizer is exposed to the solvent. This results in a non-exponential decay of the complex's emission and pronounced differences in the transient absorption signals.

摘要

将分子光催化剂整合到氧化还原惰性聚合物中是制备具有光催化活性的轻质材料的一条途径。特别是，电纺聚合物纤维因其良好的表面体积比和简单的制备工艺而具有潜力。本研究聚焦于聚丙烯腈（PAN）纤维，通过电纺将原型光敏剂（PS）三（联吡啶）钌[Ru(bpy)]嵌入其中。通过研究纳米纤维内光激发的[Ru(bpy)]与非氧化还原惰性溶剂之间的相互作用，我们解析了微环境的分布情况，这些微环境因光敏剂暴露于溶剂的程度不同而有所差异。这导致了配合物发射的非指数衰减以及瞬态吸收信号的显著差异。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/cabf/11474860/fd44150b0d08/d4ra05672h-f3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/cabf/11474860/e4ea33ba9d98/d4ra05672h-f1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/cabf/11474860/99b06d3b128b/d4ra05672h-f2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/cabf/11474860/fd44150b0d08/d4ra05672h-f3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/cabf/11474860/e4ea33ba9d98/d4ra05672h-f1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/cabf/11474860/99b06d3b128b/d4ra05672h-f2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/cabf/11474860/fd44150b0d08/d4ra05672h-f3.jpg

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