115208-28-1Relevant articles and documents
COMPOUNDS CONTAINING A PENTALENE UNIT AND PROCESS FOR THEIR PREPARATION
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Page/Page column 20-21, (2015/02/25)
Compound containing a pentalene unit having general formula (I) wherein R1 and R2, equal to or different from each other, are selected from: linear or branched C1-C20, preferably C2-C12, al
Naphthodithiophene-2,1,3-benzothiadiazole copolymers for bulk heterojunction solar cells
Wang, Bao,Tsang, Sai-Wing,Zhang, Weifeng,Tao, Ye,Wong, Man Shing
supporting information; experimental part, p. 9471 - 9473 (2011/10/12)
Two newly synthesized naphthodithiophene-based copolymers, PNB, exhibit a low optical bandgap of ～1.64 eV with which the solar cells fabricated from the blend of PNB and PC71BM afforded a power conversion efficiency of 5.3% with external quantum efficiency over 60% in a broad spectral range.
Discotic nickel bis(dithiolene) complexes - Synthesis, optoelectrochemical and mesomorphic properties
Bui, Thanh-Tuan,Thiebaut, Olivier,Grelet, Eric,Achard, Marie-France,Garreau-De Bonneval, Benedicte,Moineau-Chane Ching, Kathleen I.
experimental part, p. 2663 - 2676 (2011/08/02)
Fifteen neutral long-chain-substituted discotic nickel bis(1,2-diphenyl-1, 2-ethenedithiolene) complexes [Ni(dpedt)2], including thirteen new compounds, have been synthesized by new short and efficient synthetic pathways. Physical investigations show that these complexes are thermally stable, possess good electron-accepting properties, and absorb light strongly in the near-infrared spectral region. Electrochemical and optical properties of [Ni(dpedt)2] depend moderately on the functionalities attached to the phenyl rings of the complexes. Their LUMO and HOMO energy levels are in the range -4.7 to -5.0 and -5.7 to -6.0 eV, respectively. Two octa(n-alkoxy)- substituted complexes exhibit a columnar liquid crystalline phase with hexagonal symmetry. These highly soluble complexes are potential candidates for use as electron-accepting and electron-transporting materials for active layers in organic electronic applications, such as field-effect transistors or photovoltaic devices. Electrochemical and optical studies as well as multiphase transition behavior are reported for a series of new nickel bis(dithiolene) complexes. The effects of the nature and position of the functional groupsattached to the periphery of the complexes are investigated. X-ray diffraction measurements regarding the hexagonal columnar mesophase are reported. Copyright
New phenyl-substituted PPV derivatives for polymer light-emitting diodes-synthesis, characterization and structure-property relationship study
Chen, Zhi-Kuan,Lee, Nancy Hoi Sim,Huang, Wei,Xu, Yi-She,Cao, Yong
, p. 1009 - 1020 (2007/10/03)
Three new PPV derivatives with dialkoxyphenyl substituents, BEH2P-PPV, BEH3P-PPV, and BEH4P-PPV have been synthesized. The polymers were characterized by FT-IR, 1H NMR, and elemental analysis. The polymers possess excellent solubility, high molecular weights, high photoluminescence efficiencies and good thermal stability. The influence of substitution pattern on the formation of structural defects has been investigated by measuring the signal due to tolane-bisbenzyl moieties (TBB) in the proton NMR spectra. BEH2P-PPV with a steric phenyl group at the ortho-position on the side phenyl ring shows the lowest amount of TBB, which indicates suitable steric hindrance can be applied to suppress the formation of irregular head-to-head and tail-to-tail linkage in the polymer chains. In addition, the polarity of solvents used for the Gilch polymerization will also affect the amount of irregular structure in the polymers. Polar solvents such as THF will result in polymers with low TBB content. Energy level measurement from cyclic voltammetry revealed that the influences of the substitution pattern on the HOMOs and LUMOs are different. The three polymers possess similar HOMO energy levels while the LUMO of BEH4P-PPV is much higher than that of the other two polymers. Polymer light-emitting diodes fabricated from BEH2P-PPV, BEH3P-PPV, and BEH4P-PPV with the configuration of ITO/PEDOT/polymer/Ba/Al, emitted bright blue-green to green light with the maximum peaks at 496, 488, and 525 nm, respectively. The turn-on electric field and maximum external quantum efficiencies of the diodes are 0.30, 0.50, and 0.42 MV/cm and 0.37%, 0.66%, and 0.25% respectively. The quantum efficiency is mainly determined by the electron injection from the cathode. With the highest luminance, lowest turn-on electric field, and good quantum efficiency as well as negligible structural defects, BEH2P-PPV is the most promising material among the three polymers for polymer light-emitting diodes.
Functionalizable polycyclic aromatics through oxidative cyclization of pendant thiophenes
Tovar, John D.,Rose, Aimee,Swager, Timothy M.
, p. 7762 - 7769 (2007/10/03)
We present a general strategy for obtaining large sulfur-containing polycyclic aromatics from thienyl precursors through iron(Ill) chloride mediated oxidative cyclizations. By placing thienyl moieties in close proximity to adjacent arenes, we have directed the oxidized intermediates into controlled cyclization pathways, effectively suppressing polymer formation. Utilizing these cyclized compounds and their thienyl precursors, we have studied cyclization/polymerization pathways of polymers such as poly(2). The unsubstituted positions α to the sulfur atoms within these aromatic cores allowed for efficient halogenation and further functionalization. As a demonstration, we prepared a series of arylene-ethynylene polymers with varying degrees of chromophore aromatization and used them to probe the effects of synthetically imposed rigidity on polymer photophysical behavior. The symmetries and effective conjugation pathways within the monomers play a key role in determining photophysical properties. We observed that rigid, aromatized chromophores generally led to increased excited-state lifetimes by decreasing radiative rates of fluorescence decay.
