Two new bithiophene derivatives named as 5, 5-bis(p-N,N-dimethylaminostyryl)-2, 2 -bithiophene (BMSBT), and 5, 5-bis(p-N,N-diethylaminostyryl)-2, 2-bithiophene (BESBT) have been synthesized. Both compounds can emit s...Two new bithiophene derivatives named as 5, 5-bis(p-N,N-dimethylaminostyryl)-2, 2 -bithiophene (BMSBT), and 5, 5-bis(p-N,N-diethylaminostyryl)-2, 2-bithiophene (BESBT) have been synthesized. Both compounds can emit strong single-photon excited fluorescence (SPEF) and two-photon excited fluorescence (TPEF) with the emission peaks around ~560 nm and with the lifetime of ~1ns.展开更多
Two polymer donor materials,namely pBDT-BTI-EH and pBDT-BTI-ME,were synthesized by copoly-merizing benzodithiophene(BDT)unit with bithiophene imide(BTI)unit containing 2-ethylhexyl and methyl alkyl side chains,respect...Two polymer donor materials,namely pBDT-BTI-EH and pBDT-BTI-ME,were synthesized by copoly-merizing benzodithiophene(BDT)unit with bithiophene imide(BTI)unit containing 2-ethylhexyl and methyl alkyl side chains,respectively.Compared to pBDT-BTI-EH∶Y6 based organic solar cells(OSCs),the pBDT-BTI-ME∶Y6-based device exhibited higher charge mobilities,reduced charge recombination,more efficient exciton dissociation,and favorable film morphology,which leaded to increased short current density(Jsc),fill factor(FF)and thus a significant improvement in power conversion efficiency(PCE)from 9.31%to 15.69%.展开更多
A series of random terpolymers P2-P5 were designed and synthesized by randomly embedding 5 mol%, 10 mol%, 15 mol% and 25 mol% feed ratios of low cost 2,2-bithiophene as the third monomer to the famous donor-acceptor ...A series of random terpolymers P2-P5 were designed and synthesized by randomly embedding 5 mol%, 10 mol%, 15 mol% and 25 mol% feed ratios of low cost 2,2-bithiophene as the third monomer to the famous donor-acceptor （D-A） type copolymer PTBT-Th （P1）. All polymers showed similar molecular weight with number-average molecular weight （Mn） and weight-average molecular weight （Mw） in the range of （59-74） and （93-114） kg·mol-1, respectively, to ensure a fair comparison on the structure-property relationships. Compared with the control copolymer PTBT-Th, the random terpolymers exhibited enhanced absorption intensity in a wide range from 400 nm to 650 nm in both solution and film as well as in polymer/PC71BM blends. From grazing incident wide-angle X-ray diffraction （GIWAXS）, compared with the regularly alternated copolymer PTB7-Th, the random terpolymers demonstrated mild structural disorder with reduced （100） lamellar stacking and slightly weakened （010） π-π stacking for the polymers as well as slightly reduced PC71BM aggregation in polymer/PC71BM blends. However, the measured hole mobility for terpolymers （（1.20-3.73） × 10 -4 cm2·V-1·s-1） was evaluated to be comparable or even higher than 1.35 × 10 -4 cm2·V-1 ·s-1 of the alternative copolymer. Enhanced average power conversion efficiency （PCE） from 7.35% to 8.11% and 7.79% to 8.37% was observed in both conventional and inverted device architectures from copolymer P1 to terpolymers P4, while further increasing the 2,2-bithiophene feed ratio decreased the PCE.展开更多
In this article,three novel and simple molecular structure with donor-acceptor(D-A) type copolymers via only head-to-head alkoxy(OR) and/or alkylthio(SR) side chains onto the bithiophene(BT) as donor units and fluorin...In this article,three novel and simple molecular structure with donor-acceptor(D-A) type copolymers via only head-to-head alkoxy(OR) and/or alkylthio(SR) side chains onto the bithiophene(BT) as donor units and fluorinated benzotriazole(FBTA) as acceptor unit,namely,PBTOR-FBTA,PBTOSR-FBTA and PBTSRFBTA,were successfully designed and synthesized.The impacts of sulfur-oxygen(S…O) or sulfur-sulfur(S-S) noncovalent interactions on their physicochemical properties,molecular stacking,carrier mobility,morphologies of blend films,as well as their photovoltaic performance were deeply and systematically studied.The introduction of SR side-chains suddenly lowered the highest occupied molecular orbital(HOMO) energy levels,blue-shifted absorption,enhanced π-π stacking,as well as improved morphology of the photoactive layer blends in comparison with the re ference polymer without SR side-chain.Polymer solar cells(PSCs) were fabricated to estimate their photovoltaic performance of the polymers.Under an optimized blend ratio of PBTSR-FBTA:PC71BM(1:0.8,w/w),the PBTSR-FBTAbased device exhibits a higher power conversion efficiency(PCE) of 6.25%,which is about 3.34 and 1.87 folds than that of the PBTOR-FBTA and PBTOSR-FBTA-based devices,respectively.Our research results demonstrate that the modification of the simple and low-cost SR side chains is an effective strategy to improve the photovoltaic performance of the polymers.展开更多
2,2’-Bithiophene-5-carboxylic acid (BTA) thin-films on platinum (Pt) electrodes were electrochemically prepared in acetonitrile solution containing 0.1 M tetrabutylammonium perchlorate (TBAP) and 0.05 M BTA. These fi...2,2’-Bithiophene-5-carboxylic acid (BTA) thin-films on platinum (Pt) electrodes were electrochemically prepared in acetonitrile solution containing 0.1 M tetrabutylammonium perchlorate (TBAP) and 0.05 M BTA. These films were complexes with several metal ions such as Cu2+, Ag+ and Co2+. Their structural characteristics were compared with those of powder complexes chemically prepared from BTA and the corresponding metal ion. IR and XPS techniques reveal that the film complexes with metal ions have the same structures as the corresponding powder complexes. The electrocatalytic activity of BTA film-metal ions has been investigated toward ascorbic acid (AA) oxidation and compared to that obtained on a free BTA film. BTA film-metal ions exhibit good catalytic proprieties and better detection of AA than a free BTA film. This new propriety allows these films to be used as electrochemical sensors. This electronic document is a “live” template. The various components of your paper [title, text, heads, etc.] are already defined on the style sheet, as illustrated by the portions given in this document.展开更多
Solvent-assisted ligand exchange in the zirconium metal–organic framework(MOF)UiO-67[Zr_(6)O_(4)(OH)_(4)(PhPh)_(6);H_(2)PhPh=biphenyl-4,4’-dicarboxylic acid]with the heterocyclic linkers H_(2)TpTp(2,2’-bithiophene-...Solvent-assisted ligand exchange in the zirconium metal–organic framework(MOF)UiO-67[Zr_(6)O_(4)(OH)_(4)(PhPh)_(6);H_(2)PhPh=biphenyl-4,4’-dicarboxylic acid]with the heterocyclic linkers H_(2)TpTp(2,2’-bithiophene-5,5’-dicarboxylic acid)and H_(2)TzTz(2,2’-bithiazole-5,5’-dicarboxylic acid)in an equimolar[Zr_(6)]:linker ratio led to the corresponding MIXMOFs UiO-67-TpTp[Zr_(6)O_(4)(OH)_(4)(PhPh)_(5)(TpTp)]and UiO-67-TzTz[Zr_(6)O_(4)(OH)_(4)(PhPh)_(5)(TzTz)].Both MOFs have been thoroughly characterized in the solid state.They show the same structural topology and crystal structure of UiO-67,as confirmed by powder X-ray diffraction.Their BET specific surface area is lower than that of their parent material(1700 and 1310 m^(2) g^(−1) for UiO-67-TpTp and UiO-67-TzTz,respectively,vs.1877 m^(2) g^(−1) for UiO-67),while the thermal stability of UiO-67(T_(dec)=819 K)is maintained.The“diluted”inclusion,in the UiO-673D framework,of luminescent heterocyclic linkers emitting in the blue-green visible region induces luminescence in the final MOFs(emission λ_(max)=442 and 420 nm for UiO-67-TpTp and UiO-67-TzTz,respectively),preventing self-quenching effects caused by the proximity of the emitters in the crystal structure.Both MOFs have been tested as sensors for contaminants of emerging concern(CECs)in water:an emission intensity increase has been observed when suspended in contact with diclofenac sodium,fluoxetine,ibuprofen and sulfamethoxazole.In particular,UiO-67-TzTz has shown a linearly increasing trend for a specific concentration range(up to 30–40μM for diclofenac,fluoxetine and ibuprofen;up to 100μM for sulfamethoxazole).UiO-67-TzTz also behaves as an adsorbent vs.diclofenac,with a maximum adsorption capacity(Xm)of 62.5 mg g^(−1).These findings pave the way to the practical utilization of UiO-67-TzTz as a multifunctional material(i.e.CECs luminescent sensor and adsorbent at one time)for environmental remediation.展开更多
基金This work is supported by the National Natural Science Foundation of China(No.20172034)grant for State Key Program of China.
文摘Two new bithiophene derivatives named as 5, 5-bis(p-N,N-dimethylaminostyryl)-2, 2 -bithiophene (BMSBT), and 5, 5-bis(p-N,N-diethylaminostyryl)-2, 2-bithiophene (BESBT) have been synthesized. Both compounds can emit strong single-photon excited fluorescence (SPEF) and two-photon excited fluorescence (TPEF) with the emission peaks around ~560 nm and with the lifetime of ~1ns.
文摘Two polymer donor materials,namely pBDT-BTI-EH and pBDT-BTI-ME,were synthesized by copoly-merizing benzodithiophene(BDT)unit with bithiophene imide(BTI)unit containing 2-ethylhexyl and methyl alkyl side chains,respectively.Compared to pBDT-BTI-EH∶Y6 based organic solar cells(OSCs),the pBDT-BTI-ME∶Y6-based device exhibited higher charge mobilities,reduced charge recombination,more efficient exciton dissociation,and favorable film morphology,which leaded to increased short current density(Jsc),fill factor(FF)and thus a significant improvement in power conversion efficiency(PCE)from 9.31%to 15.69%.
基金financially supported by the the National Natural Science Foundation of China(No.61761136013)the Natural Science Foundation of Jiangsu Province(Nos.BK20160042 and BK20160990)+1 种基金DFG(392306670)the CSC for financial support
文摘A series of random terpolymers P2-P5 were designed and synthesized by randomly embedding 5 mol%, 10 mol%, 15 mol% and 25 mol% feed ratios of low cost 2,2-bithiophene as the third monomer to the famous donor-acceptor （D-A） type copolymer PTBT-Th （P1）. All polymers showed similar molecular weight with number-average molecular weight （Mn） and weight-average molecular weight （Mw） in the range of （59-74） and （93-114） kg·mol-1, respectively, to ensure a fair comparison on the structure-property relationships. Compared with the control copolymer PTBT-Th, the random terpolymers exhibited enhanced absorption intensity in a wide range from 400 nm to 650 nm in both solution and film as well as in polymer/PC71BM blends. From grazing incident wide-angle X-ray diffraction （GIWAXS）, compared with the regularly alternated copolymer PTB7-Th, the random terpolymers demonstrated mild structural disorder with reduced （100） lamellar stacking and slightly weakened （010） π-π stacking for the polymers as well as slightly reduced PC71BM aggregation in polymer/PC71BM blends. However, the measured hole mobility for terpolymers （（1.20-3.73） × 10 -4 cm2·V-1·s-1） was evaluated to be comparable or even higher than 1.35 × 10 -4 cm2·V-1 ·s-1 of the alternative copolymer. Enhanced average power conversion efficiency （PCE） from 7.35% to 8.11% and 7.79% to 8.37% was observed in both conventional and inverted device architectures from copolymer P1 to terpolymers P4, while further increasing the 2,2-bithiophene feed ratio decreased the PCE.
基金financially supported by grants from the National Natural Science Foundation of China(Nos.51573154,51673031)The Natural Science Foundation of Jiangsu Higher Institutions of China(No.18KJA480001)+2 种基金the Youth Science and Technology Foundation of Sichuan Province(No.2013JQ0032)the key Laboratory of Environment-Friendly Chemistry and Applications of Ministry of Education(No.2018HJYH01)the Natural Science Foundation of Jiangsu Province(No.BK20141151)。
文摘In this article,three novel and simple molecular structure with donor-acceptor(D-A) type copolymers via only head-to-head alkoxy(OR) and/or alkylthio(SR) side chains onto the bithiophene(BT) as donor units and fluorinated benzotriazole(FBTA) as acceptor unit,namely,PBTOR-FBTA,PBTOSR-FBTA and PBTSRFBTA,were successfully designed and synthesized.The impacts of sulfur-oxygen(S…O) or sulfur-sulfur(S-S) noncovalent interactions on their physicochemical properties,molecular stacking,carrier mobility,morphologies of blend films,as well as their photovoltaic performance were deeply and systematically studied.The introduction of SR side-chains suddenly lowered the highest occupied molecular orbital(HOMO) energy levels,blue-shifted absorption,enhanced π-π stacking,as well as improved morphology of the photoactive layer blends in comparison with the re ference polymer without SR side-chain.Polymer solar cells(PSCs) were fabricated to estimate their photovoltaic performance of the polymers.Under an optimized blend ratio of PBTSR-FBTA:PC71BM(1:0.8,w/w),the PBTSR-FBTAbased device exhibits a higher power conversion efficiency(PCE) of 6.25%,which is about 3.34 and 1.87 folds than that of the PBTOR-FBTA and PBTOSR-FBTA-based devices,respectively.Our research results demonstrate that the modification of the simple and low-cost SR side chains is an effective strategy to improve the photovoltaic performance of the polymers.
文摘2,2’-Bithiophene-5-carboxylic acid (BTA) thin-films on platinum (Pt) electrodes were electrochemically prepared in acetonitrile solution containing 0.1 M tetrabutylammonium perchlorate (TBAP) and 0.05 M BTA. These films were complexes with several metal ions such as Cu2+, Ag+ and Co2+. Their structural characteristics were compared with those of powder complexes chemically prepared from BTA and the corresponding metal ion. IR and XPS techniques reveal that the film complexes with metal ions have the same structures as the corresponding powder complexes. The electrocatalytic activity of BTA film-metal ions has been investigated toward ascorbic acid (AA) oxidation and compared to that obtained on a free BTA film. BTA film-metal ions exhibit good catalytic proprieties and better detection of AA than a free BTA film. This new propriety allows these films to be used as electrochemical sensors. This electronic document is a “live” template. The various components of your paper [title, text, heads, etc.] are already defined on the style sheet, as illustrated by the portions given in this document.
基金the PRIN 2017 project MULTI-e(Ref.20179337R7)“Multielectron transfer for the conversion of small molecules:an enabling technology for the chemical use of renewable energy”the TRAINER project“Catalysts for Transition to Renewable Energy Future”(Ref.ANR-17-MPGA-0017)for financial support.C.P.thanks Fondazione con il Sud for funding the project HApECOrk(Ref.2015-0243).
文摘Solvent-assisted ligand exchange in the zirconium metal–organic framework(MOF)UiO-67[Zr_(6)O_(4)(OH)_(4)(PhPh)_(6);H_(2)PhPh=biphenyl-4,4’-dicarboxylic acid]with the heterocyclic linkers H_(2)TpTp(2,2’-bithiophene-5,5’-dicarboxylic acid)and H_(2)TzTz(2,2’-bithiazole-5,5’-dicarboxylic acid)in an equimolar[Zr_(6)]:linker ratio led to the corresponding MIXMOFs UiO-67-TpTp[Zr_(6)O_(4)(OH)_(4)(PhPh)_(5)(TpTp)]and UiO-67-TzTz[Zr_(6)O_(4)(OH)_(4)(PhPh)_(5)(TzTz)].Both MOFs have been thoroughly characterized in the solid state.They show the same structural topology and crystal structure of UiO-67,as confirmed by powder X-ray diffraction.Their BET specific surface area is lower than that of their parent material(1700 and 1310 m^(2) g^(−1) for UiO-67-TpTp and UiO-67-TzTz,respectively,vs.1877 m^(2) g^(−1) for UiO-67),while the thermal stability of UiO-67(T_(dec)=819 K)is maintained.The“diluted”inclusion,in the UiO-673D framework,of luminescent heterocyclic linkers emitting in the blue-green visible region induces luminescence in the final MOFs(emission λ_(max)=442 and 420 nm for UiO-67-TpTp and UiO-67-TzTz,respectively),preventing self-quenching effects caused by the proximity of the emitters in the crystal structure.Both MOFs have been tested as sensors for contaminants of emerging concern(CECs)in water:an emission intensity increase has been observed when suspended in contact with diclofenac sodium,fluoxetine,ibuprofen and sulfamethoxazole.In particular,UiO-67-TzTz has shown a linearly increasing trend for a specific concentration range(up to 30–40μM for diclofenac,fluoxetine and ibuprofen;up to 100μM for sulfamethoxazole).UiO-67-TzTz also behaves as an adsorbent vs.diclofenac,with a maximum adsorption capacity(Xm)of 62.5 mg g^(−1).These findings pave the way to the practical utilization of UiO-67-TzTz as a multifunctional material(i.e.CECs luminescent sensor and adsorbent at one time)for environmental remediation.
