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Emission behaviors of unsymmetrical 1,3-diaryl-β-diketones: A model perfectly disclosing the effect of molecular conformation on luminescence of organic solids

A series of unsymmetrical 1,3-diaryl-β-diketones 1–6 displaying molecular conformation-dependent fluorescence quantum yields have been synthesized. Crystals with planar molecular conformation such as 1, 2, 3 and 4 are highly fluorescent (φ(f): 39–53%), and the one holding slightly twisted conformati...

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Detalles Bibliográficos
Autores principales: Cheng, Xiao, Li, Feng, Han, Shenghua, Zhang, Yufei, Jiao, Chuanjun, Wei, Jinbei, Ye, Kaiqi, Wang, Yue, Zhang, Hongyu
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2015
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4360484/
https://www.ncbi.nlm.nih.gov/pubmed/25771808
http://dx.doi.org/10.1038/srep09140
Descripción
Sumario:A series of unsymmetrical 1,3-diaryl-β-diketones 1–6 displaying molecular conformation-dependent fluorescence quantum yields have been synthesized. Crystals with planar molecular conformation such as 1, 2, 3 and 4 are highly fluorescent (φ(f): 39–53%), and the one holding slightly twisted conformation (5) is moderately luminescent (φ(f) = 17%), while crystal 6 possessing heavily bent structure is completely nonluminous (φ(f) ~ 0). The distinct fluorescence efficiencies are ascribed to their different molecular conformations, since all the crystals hold the same crystal system, space group and crystal packing structures. Additionally, the fluorescent crystals 1–5 display low threshold amplified spontaneous emission (ASE) with small full widths at half-maximum (FWHM: 3–7 nm), indicating their potential as candidates for organic crystal lasing devices.