Title of article :
New naphthalene polyimide with unusual molar absorption coefficient and excited state properties: Synthesis, photophysics and electrochemistry
Author/Authors :
Mustafa E. Ozser، نويسنده , , Ilke Yucekan، نويسنده , , Jagadeesh B. Bodapati، نويسنده , , Huriye Icil، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2013
Pages :
9
From page :
542
To page :
550
Abstract :
A high molecular weight 1,4,5,8-naphthalene polyimide (ENPI) by one-step polycondensation mechanism and for comparison its monomeric diimide (ENDI) were synthesized; the photophysical and electrochemical properties were studied in detail for ENPI. Monomer has shown unusual insolubility so that the characterization proven to be difficult, whereas ENPI has shown better solubility. The molecular weight data obtained by GPC for the polymer were Mn=8240 and Mw=34,000 g mol−1 respectively with a polydispersity of 4.13. The polyimide exhibited outstandingly high molar absorption coefficients as 599,000, 1,021,000, and 972,700 M−1 cm−1, which is first time reported in literature for the characteristic 0–2, 0–1, and 0–0 electronic transitions, respectively. ENPI showed concentration dependent and red shifted excimer emission in 1,1,2,2-tetrachloroethane (TCE). The polymer has undergone multielectron reductions in CHCl3 solution below 100 mV s−1 scan rates which merged into two reversible one-electron reduction peaks at higher scan rates. In solid-state, similar scan rate dependent reduction peaks were noticed. The LUMO, HOMO and optical band gap values obtained for ENPI were −3.73, −6.91, and 3.18 eV respectively. ENDI polymer with striking features has great potential as new sensitizer for efficient dye sensitized organic cells.
Keywords :
excimer , Extremely high molar absorptivity , Naphthalene polymer , Multielectron reductions , Electrochemical stability , high molecular weight
Journal title :
Journal of Luminescence
Serial Year :
2013
Journal title :
Journal of Luminescence
Record number :
1263038
Link To Document :
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