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Contrasting Solid-State Fluorescence of Diynes with Small and Large Aryl Substituents: Crystal Packing Dependence and Stimuli-Responsive Fluorescence Switching

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Title Contrasting Solid-State Fluorescence of Diynes with Small and Large Aryl Substituents: Crystal Packing Dependence and Stimuli-Responsive Fluorescence Switching
 
Creator PATI, AK
GHARPURE, SJ
MISHRA, AK
 
Subject AGGREGATION-INDUCED EMISSION
LIGHT-EMITTING-DIODES
CONJUGATED POLYMERS
OPTICAL-PROPERTIES
SOLAR-CELLS
INTERMOLECULAR INTERACTIONS
LUMINESCENCE PROPERTIES
MOLECULAR PACKING
CHARGE-TRANSFER
CARBON BOND
 
Description There has been a significant current interest in solid state luminescence of organic molecules and their stimuli responsive fluorescence switching behavior. Although small organic derivatives with olefinic, acetylenic, phenylenevinylenic, phenyleneethynylenic spacers are widely documented as solid state emitters in the literature, the solid state photophysics of organic derivatives with "butadiyne" spacer still remains unexplored. We provide detailed investigation on the solid state fluorescence properties of a series of butadiynyl fluorophores. Replacement of a phenyl ring, which is at periphery of the butadiyne bridge, with a large moiety such as pyrenyl group furnishes contrasting emissions in the solid state. While the butadiyne bridged phenyl derivatives show a blue shift of emission maxima in the solid powder with respect to monomer spectra in solution state, the butadiyne bridged pyrenyl derivatives exhibit a red shift in the solid state. The blue shift of the emission maxima of the butadiyne bridged phenyl derivatives in the solid powder is attributed to allowed transition in aggregates with nearly parallel transition dipoles. On the other hand, formation of pyrenyl excimer accounts for the excitonic red shift of the butadiyne bridged pyrenyl derivatives in the solid powder. In addition to that, the solid state fluorescence of the pyrenyl analogues is reversibly switched between two aggregate forms through external heating and rubbing stimuli.
 
Publisher AMER CHEMICAL SOC
 
Date 2016-01-15T06:10:20Z
2016-01-15T06:10:20Z
2015
 
Type Article
 
Identifier JOURNAL OF PHYSICAL CHEMISTRY A, 119(42)10481-10493
1089-5639
http://dx.doi.org/10.1021/acs.jpca.5b08445
http://dspace.library.iitb.ac.in/jspui/handle/100/17897
 
Language en