کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1229154 1495227 2015 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Comparative study on bulk and composite fibrous samples photophysical feature: Synthesis and characterization of a fluorine-containing Re(I) complex and its electrospinning fibers
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آنالیزی یا شیمی تجزیه
پیش نمایش صفحه اول مقاله
Comparative study on bulk and composite fibrous samples photophysical feature: Synthesis and characterization of a fluorine-containing Re(I) complex and its electrospinning fibers
چکیده انگلیسی


• A ligand with electron-withdrawing groups and its Re(I) complex were fabricated.
• Geometric structure, electronic nature and photophysical parameters were studied.
• Comparative analysis between composite fibers and bulk sample was performed.
• Polymer immobilization could improve PL performance by repressing relaxation.

This paper reported a diamine ligand 2-(4-fluorophenyl)-5-(pyridin-2-yl)-1,3,4-oxadiazole (referred to as FPOZ) owing two typical electron-withdrawing moieties of an oxidiazole group and a fluorine atom, as well as its corresponding Re(I) complex Re(CO)3(FPOZ)Br. Geometric structure and electronic nature of Re(CO)3(FPOZ)Br were explored and discussed by single crystal analysis and theoretical calculation, which suggested that Re(CO)3(FPOZ)Br took a distorted octahedral coordination field. The onset electronic transitions owned a mixed character of metal-to-ligand-charge-transfer (MLCT) and ligand-to-ligand-charge-transfer (LLCT). Re(CO)3(FPOZ)Br was then doped into a polymer host. Photophysical difference between resulting composite fibers and bulk Re(CO)3(FPOZ)Br was carefully performed, so that the correlation between emissive performance and electron-withdrawing group/geometric relaxation could be investigated. It was found that the immobilization in polymer matrix could repress MLCT excited state geometric relaxation, leading to improved PL parameters such as emission blue shift, longer excited state lifetime and higher photostability.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy - Volume 142, 5 May 2015, Pages 43–49
نویسندگان
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