Search

Abstract: Direct anodic oxidation of 1,5-dihydroxynaphthalene (DHN), an important derivative of naphthalene, led to the formation of high-quality semiconducting poly(1,5-dihydroxynaphthalene) (PDHN) on stainless steel sheets in boron trifluoride diethyl etherate (BFEE). The onset oxidation potential of DHN in this medium was measured to be only 0.78V vs. SCE, which was lower than that determined in traditional acetonitrile containing 0.1mol/L tetrabutylammonium tetrafluoroborate (0.98V vs. SCE). As-formed PDHN films showed good redox activity and stability, together with interesting electrochromic property from brown (doped) to yellow-green (dedoped). Structural characterization, including FTIR, 1H NMR, and quantum chemistry calculations, indicated that the polymerization of DHN probably occurred at C4 and C8 positions. Moreover, thermal analysis revealed that PDHN displayed better thermal stability than that synthesized by chemical method. The fluorescence spectral studies, together with the electrical tests, showed that PDHN was a good blue light-emitter (fluorescence quantum yield higher than 0.1) with an electrical conductivity of as high as 0.46S/cm. [Copyright &y& Elsevier]

Abstract: A novel conducting polymer poly(9-cyanophenanthrene) (P9CP) was synthesized electrochemically by direct anodic oxidation of 9-cyanophenanthrene (9CP) in boron trifluoride diethyl etherate (BFEE). The oxidation onset potential of 9CP in the medium was measured to be 1.6V vs. a saturated calomel electrode (SCE). P9CP films obtained from BFEE showed good electrochemical behavior and good thermal stability with electrical conductivity of 0.13Scm−1 in the doped state. The polymer of P9CP may be an attractive candidate material for organic light-emitting material with blue-green-light-emitting upon irradiation with 365nm UV light. Moreover, the P9CP films on the ITO electrode showed good electrochromic property from dark green to dark yellow, between the doped and dedoped state. FTIR and the quantum chemistry calculation indicated that the 9CP was grown via the coupling of the monomer mainly at the C3, and C12 positions. [Copyright &y& Elsevier]

Abstract: A novel semi-conducting polymer poly(9-bromophenanthrene) (P9BP) was synthesized electrochemically by direct anodic oxidation of it is monomer 9-bromophenanthrene (9BP) in boron trifluoride diethyl etherate (BFEE). The oxidation onset potential of 9BP in this medium was measured to be only 1.33V vs. saturated calomel electrode (SCE). P9BP films obtained from BFEE showed good electrochemical behavior and nice thermal stability with electrical conductivity of 0.03Scm−1. FTIR and 1H NMR spectra together with theoretical quantum chemistry calculations indicated that the P9BP was mainly grown via the coupling of the monomer at C3 and C6 positions. Furthermore, P9BP exhibited strong electrochromic nature from opaque green to light yellow between the doped and dedoped states on ITO electrode in solid state. Fluorescence spectral studies indicated that P9BP was a blue light emitter. [Copyright &y& Elsevier]