共查询到20条相似文献,搜索用时 218 毫秒
1.
制备了聚苯乙炔(PPA)LB多层膜,将其作为电荷产生层首次应用于机能分离型光电导体领域.从π A曲线发现,PPA单分子膜具有表面压力的各向异性和松弛特性.TEM照片显示,PPA分子链在LB膜中有序排列.转移比和XPS的研究表明,复合膜沉积均匀.与PPA涂膜相比,以PPA LB多层膜作为电荷产生层的光电导体表面充电电位V0=1345V,光照1s后的光衰百分比ΔV1s=6505%,半衰时间t1/2=058s,具有更优异的光电导性能. 相似文献
2.
聚甲基丙烯酸甲酯Langmuir—Blodgett复合膜及其在光电导体中… 总被引:1,自引:0,他引:1
制备了聚甲基丙烯酸甲酯(PMMA)LB复合膜,将其作为阻挡层首次应用于机能分离型光电导体领域。从π-A曲线发现PMMA单分子膜具有表面压力的各向异性和松弛特性。TEM照片显示,PMMA分子链在复合膜中有序排列。转移比、UV和XPS研究表明,复合膜沉积均匀。以PMMA-LB复合膜作为阻挡层的光电导体表面充电电位V0=1518V,光照1s后的光衰百分率△V1s=50.16%,半衰期t1/2=0.93s 相似文献
3.
该研究合成了一种新型水溶性大π共轭高分子———聚吡咯 {2 ,5 [ 二( 对二甲氨基苯甲烯)]}(PPDMAB) ,它能溶于强酸的水溶液,在1mol/L 的盐酸中溶解度为0-5 ~1-0g/100mL.通过EA、XPS、FT IR、UV Vis NIR、In situ UV Vis NIR 对PPDMAB进行了结构表征.通过质子化、碘掺杂、浓硫酸(98 % ) 掺杂等处理,PPDMAB的电导率提高2~4 个数量级(δ= 10 - 7 ~10- 5S/cm) .在质子化、去质子化的过程中PPDMAB发生了可逆的颜色变化,本征态( 综色) 质子态( 墨兰色) . 相似文献
4.
研究了细胞色素C(Cyt.C)在一种新的电子转移促进剂4,6-二甲基-2-巯基嘧啶修饰微带金电极(DMMP/Au)上的氧化还原热力学;求得Cyt.C在DMMP/Au电极上反应的标准电极电位E^o,熵变△S^o,焓变△II^o及Gibbs自由能的改变△G10值分别为:0.272V(us.NHE),-123.7J.mol^-^1,-63.1kJ.mol.mol^-^1和-26.2kJ.mol^-^1( 相似文献
5.
不对称烷氧基取代聚对苯乙炔的合成及电致发光性能 总被引:3,自引:0,他引:3
利用强碱诱导的去卤缩合聚合法,合成了不对称烷氧基取代的聚(2-甲氧基-5-十二烷氧基-1,4-对苯乙炔)(PMDPV).其溶解性和成膜性能优于对称取代的聚(2,5-双十二烷氧基-1,4-对苯乙炔).以PMDPV为发光层质的聚合物电致发光器件,其发光峰值波长为605nm.并用IR、UV-Vis、TGA、1HNMR、GPC等对所合成的聚合物进行了表征. 相似文献
6.
新型大溶性大π共轭高分子—聚吡咯—{2,5—[双(对二甲氨基苯甲烯)]}?… 总被引:1,自引:0,他引:1
该研究合成了一种新型水溶性大π共轭高分子-聚吡咯-{2,5-〔二(对二甲氨基苯甲烯)〕}(PPDMAB),它地强酸的水溶液,在1mol/L的盐酸中溶解度为0.5~1.0g/100mL,通过EA、XPS、FT-IR、UV-Vis-NIR、In-situUV-Vis-NIR对PPDMAB进行了结构表征。通过质子化、碘掺杂、浓硫酸(98%)掺杂等处理,PPDMAB的电导率提高2~4个数量组(&=1-^-7 相似文献
7.
本文用气相色谱、激光拉曼、激光散射、GPC以及粘度等方法研究了苯乙烯—二乙烯苯的自由基交联共聚反应.求得聚合反应初期的表现速率常数Kst、Km-DVB及Kp-DVB分别为1.68×10-2(小时-1)、3.43×10-2(小时-1)及5.54×10-2(小时-1);从悬挂双键含量变化解释分子内环化推迟了凝胶化点;由跟踪检测反应中分子重量、尺寸变化指出宏观尺寸分子的出现使重均分子量()在凝胶化点发散;讨论了多分散、支化对分子尺寸Rg(均方旋转半径)、Rh(流体力学半径)的影响,定量关系为:δ=Rg/Rh=0.0061exP(1.432t);拟合了Rh对反应时间的指数依赖性RA=5.195exp(0.872t),这证实了凝胶化点前属反应控制机理。 相似文献
8.
8—氮鸟嘌呤的极谱伏安行为 总被引:4,自引:0,他引:4
用循环伏安法(CV)、电流采样极诸法(SCP,即TAST)、常规脉冲极谱法(NPP)、微分脉冲极谱法(DPP)、线性扫描伏安法(LSV)、Osteryoung方波伏安法(OSWV)和计时库仑法(CC)等电化学技术研究了抗癌药物8-氮鸟嘌呤(8-azaguanine,guanazolo,简称8-AG)的极谱伏安行为.在 0. 1mol/L H2SO4底液中,8-AG有一良好的还原峰,峰电位(Ep)在-0. 95V(vs.Ag/AgCl,下同)附近,8-AG浓度在4×10-6~8×10-4mol/L范围内.峰高与浓度有良好的线性关系,线性相关系数r=0.9999~0.9910,检出限为1× 10-6mol/L.实验证明了该峰具有吸附性.本文提出了电极反应机理,它包括:酸性介质中8-AG的质子化、质子化的8-AG在汞电极上吸附以及完全不可逆的两电子还原过程.同时用量子化学计算方法(全略微分重叠法即CNDO/2)对8-AG和鸟嘌呤的各原子的净电荷以及Wiberg键级进行了计算,从理论上解释了8-AG的电化学还原机理。 相似文献
9.
LIN Feng 《高等学校化学研究》1998,(4)
IntroductionIn1963,MoorA.M.[1]firstlyreportedthephosphateefect,i.e.,intheUVirradiation(253.7nm)ofaqueoussolutionsof4-amino-2-... 相似文献
10.
氢化物发生—冷阱捕获—色谱分离—原子吸收法测定天然水中坤的形态 总被引:10,自引:0,他引:10
研究建立了氢化物发生-冷阱捕获-色谱分离-原子吸收方法测定天然水中四种主要砷形态,测试系统自行组装,色谱柱填料采用ChromosorbGAW-DMCS(粒径0.3~0.45mm),其上涂布3%OV-101。方法的检出限以砷计分别为:As(V)0.51ng,As(Ⅲ)0.43ng,MMA0.38ng,DMA0.67ng;12ng砷标准偏差为As(Ⅴ)4.21%,As(Ⅱ)3.56%,MMA3.23% 相似文献
11.
本文以氯化酞菁铟(ClInPc)为载流子发生层(CGL),四苯基联苯胺(TPD)与聚乙烯咔唑(PVK)复合为载流子传输层(CTL),形成双层结构的功能分离型有机光电导体(P/R),研究了它的静电感光性能。结果表明,ClInPc/PMMA(30%)与TPD/PVK(1:1)两者匹配时的P/R具有良好的光电导性能,其电荷接受能力Vmax≈800V,光电导率△Vt(ls)>70%,暗衰小(<50V/s),残余电位低(30V/s).由真空蒸镀成膜(CGL)所研制的P/R的光电导性能更为优异。 相似文献
12.
Fronczek FR Delord TJ Watkins SF Gueorguieva P Stanley GG Zizza AS Cornelius JB Mantz YA Musselman RL 《Inorganic chemistry》2003,42(22):7026-7036
Crystal structures of three Ni(CN)(4)(2)(-) salts all with eclipsed ligands and varying axial stacking arrangements are presented. The absorption spectra of all three salts show a slight red shift in the x,y-polarizations and a large red shift in their z-polarizations upon crystallization from solution. Semiempirical ZINDO calculations provide a good model of the solid state, even with only a three-molecule segment, allowing reproduction of the red-shifting and intensity increase upon crystallization found experimentally. The modified nickel beta(s,p) bonding parameter of -5 found appropriate for Ni coordination in our previous studies of single Ni(CN)(4)(2-) planes and a helically stacked Cs(2)[Ni(CN)(4)].H(2)O crystal was changed to -3 for the more parallel-stacked Ni(CN)(4)(2-) planes in this case, while beta(d) was retained at -41. Crystal data are as follows: Na(2)[Ni(CN)(4)].3H(2)O, triclinic space group P1, a = 7.2980(10) A, b = 8.8620(10) A, c = 15.132(2) A, alpha = 89.311(5) degrees, beta = 87.326(5) degrees, gamma = 83.772(6) degrees, V = 971.8(2) A(3), T = 100 K, Z = 4, R = 0.024, R(w) = 0.064; Sr[Ni(CN)(4)].5H(2)O, monoclinic space group C2/m, a = 10.356(2) A, b = 15.272(3) A, c = 7.1331(10) A, beta = 98.548(12) degrees, V = 1115.6(3) A(3), T = 100 K, Z = 4, R = 0.024, R(w) = 0.059; Rb(2)[Ni(CN)(4)].1.05H(2)O, triclinic space group P1, a = 8.6020(10) A, b = 9.6930(10) A, c = 12.006(2) A, alpha = 92.621(6) degrees, beta = 94.263(6) degrees, gamma = 111.795(10) degrees, V = 924.0(2) A(3), T = 100 K, Z = 4, R = 0.034, R(w) = 0.067. 相似文献
13.
1INTRODUCTIONInrecentyears,higher nuclearityclustershavereceivedconsiderableatentionbecauseoftheirpotentialapplicationsinmany... 相似文献
14.
Xin Wang Shi-Jia Gao Jin-Feng Han Yu-Lin Zhang Sai Zhang Wen-Qiang Qiao Zhi-Yuan Wang 《高分子科学》2021,39(7):831-837
A series of polymer photodetectors with device configuration of ITO/PEDOT:PSS/P_3 HT:PC_(61) BM/C_(60)/Al were prepared by using P_3 HT as the donor material and PC_(61) BM as the acceptor material. By regulating the content of 1,8-diiodooctane(DIO)(V/V: 1%, 3%, 5%) as a processing additive, the morphology of the active layer can be greatly improved. With C_(60) as the hole blocking layer, the dark current density of the device can be reduced by about an order of magnitude. When employing 3% DIO(V/V) in the active layer processing, the photodetetcors present the best performance, and the detectivity of the device is 1.52×10~(12) Jones at 540 nm under a bias of-0.1 V. Moreover, it also has a wider linear dynamic range of 60 dB as well as faster response speed(τ_r/τ_f=0.53/0.71 μs) than those of devices with other content of DIO additives. 相似文献
15.
1 INTRODUCTION Supramolecular approaches to self-assembly of infinite molecular solids with novel structural topo- logies attract considerable attention for their po- tential applications as functional materials and their fascinating architectures[1]. In… 相似文献
16.
The syntheses of macrocyclic species composed of carborane derivatives joined via their carbon vertices by electrophilic mercury atoms are described. The reaction of closo-1,2-Li(2)[C(2)B(10)H(10)(-)(x)()R(x)()] with HgI(2) gives Li(2)[(1,2-C(2)B(10)H(10)(-)(x)()R(x)()Hg)(4)I(2)] [R = Et, x = 2 (5.I(2)Li(2)); R = Me, x = 2 (6.I(2)Li(2)); R = Me, x = 4 (7.I(2)Li(2))]. 6.I(2)(K.[18]dibenzocrown-6)(2) crystallizes in the monoclinic space group C2/m [a = 28.99(2) ?, b = 18.19(1) ?, c = 13.61(1) ?, beta = 113.74(2) degrees, V = 6568 ?(3), Z = 4, R = 0.060, R(w) = 0.070]; 7.I(2)(NBu(4))(2) crystallizes in the monoclinic space group P2(1)/c [a = 12.77(1) ?, b = 21.12(2) ?, c = 20.96(2) ?, beta = 97.87(2) degrees, V = 5600 ?(3), Z = 2, R = 0.072, R(w) = 0.082]. The precursor to 7, closo-8,9,10,12-Me(4)-1,2-C(2)B(10)H(8) (4), is made in a single step by reaction of closo-1,2-C(2)B(10)H(12) with MeI in trifluoromethanesulfonic acid. The free hosts 5, 6, and 7 are obtained by reaction of the iodide complexes with stoichiometric quantities of AgOAc. A (199)Hg NMR study indicates that sequential removal of iodide from 5.I(2)Li(2) and 6.I(2)Li(2) with aliquots of AgOAc solution leads to formation of two intermediate host-guest complexes in solution, presumed to be 5(6)ILi and 5(2)(6)(2).ILi. Crystals grown from a solution of 6.I(2)Li(2) to which 1 equiv of AgOAc solution had been added proved to be an unusual stack structure with the formula 6(3).I(4)Li(4) [tetragonal, I4/m, a = 21.589(2) ?, c = 21.666(2) ?, V = 10098 ?(3), Z = 2, R = 0.058, R(w) = 0.084]. Addition of 2 equiv of NBu(4)Br ion to 5 or 6 gives 5.Br(2)(NBu(4))(2) and 6.Br(2)(NBu(4))(2), respectively, while addition of 1 equiv of KBr to 6 forms 6.BrK. 5.Br(2)(NBu(4))(2) crystallizes in the triclinic space group P&onemacr;, [a = 10.433(1) ?, b = 13.013(1) ?, c = 15.867(2) ?, alpha = 91.638(2) degrees, beta = 97.186(3) degrees, gamma = 114.202(2) degrees, V = 1492 ?(3), Z = 1, R = 0.078, R(w) = 0.104]. The hosts 5 and 6 form 1:1 supramolecular adducts with the polyhedral anions B(10)I(10)(2)(-) and B(12)I(12)(2)(-) in solution. 相似文献
17.
Leung SK Tsui WM Huang JS Che CM Liang JL Zhu N 《Journal of the American Chemical Society》2005,127(47):16629-16640
[Ru(VI)(TMP)(NSO2R)2] (SO2R = Ms, Ts, Bs, Cs, Ns; R = p-C6H4OMe, p-C6H4Me, C6H5, p-C6H4Cl, p-C6H4NO2, respectively) and [Ru(VI)(Por)(NTs)2] (Por = 2,6-Cl2TPP, F20-TPP) were prepared by the reactions of [Ru(II)(Por)(CO)] with PhI=NSO2R in CH2Cl2. These complexes exhibit reversible Ru(VI/V) couple with E(1/2) = -0.41 to -0.12 V vs Cp2Fe(+/0) and undergo imido transfer reactions with styrenes, norbornene, cis-cyclooctene, indene, ethylbenzenes, cumene, 9,10-dihydroanthracene, xanthene, cyclohexene, toluene, and tetrahydrofuran to afford aziridines or amides in up to 85% yields. The second-order rate constants (k2) of the aziridination/amidation reactions at 298 K were determined to be (2.6 +/- 0.1) x 10(-5) to 14.4 +/- 0.6 dm3 mol(-1) s(-1), which generally increase with increasing Ru(VI/V) reduction potential of the imido complexes and decreasing C-H bond dissociation energy (BDE) of the hydrocarbons. A linear correlation was observed between log k' (k' is the k2 value divided by the number of reactive hydrogens) and BDE and between log k2 and E(1/2)(Ru(VI/V)); the linearity in the former case supports a H-atom abstraction mechanism. The amidation by [Ru(VI)(TMP)(NNs)2] reverses the thermodynamic reactivity order cumene > ethylbenzene/toluene, with k'(tertiary C-H)/k'(secondary C-H) = 0.2 and k'(tertiary C-H)/k'(primary C-H) = 0.8. 相似文献
18.
1 INTRODUCTION The transition metal cluster complexes exhi- biting multistep redox processes have attracted more and more attention because of their potential applications in the areas of photonic and electronic devices[1~4]. The oxo-centered carboxyla… 相似文献
19.
1 INTRODUCTION Tri-butyl phosphate (TBP) has been widely used as the extraction reagent in U-Th fuel to separate uranium from thorium. But di-butyl phos- phate (DBP) and butyl phosphate (MBP), the radio- lytic products of TBP, exhibit some coordinated ability to the fission elements, such as Zr and Nb. The substitutes for TBP have being studied for several decades[1~4]. The physical and chemical properties of amides are similar to those of TBP and they selectively extract U(Ⅵ… 相似文献
20.
Hunter BM Villahermosa RM Exstrom CL Hill MG Mann KR Gray HB 《Inorganic chemistry》2012,51(12):6898-6905
Isomers of Ir(2)(dimen)(4)(2+) (dimen = 1,8-diisocyanomenthane) exhibit different Ir-Ir bond distances in a 2:1 MTHF/EtCN solution (MTHF = 2-methyltetrahydrofuran). Variable-temperature absorption data suggest that the isomer with the shorter Ir-Ir distance is favored at room temperature [K = ~8; ΔH° = -0.8 kcal/mol; ΔS° = 1.44 cal mol(-1) K(-1)]. We report calculations that shed light on M(2)(dimen)(4)(2+) (M = Rh, Ir) structural differences: (1) metal-metal interaction favors short distances; (2) ligand deformational-strain energy favors long distances; (3) out-of-plane (A(2u)) distortion promotes twisting of the ligand backbone at short metal-metal separations. Calculated potential-energy surfaces reveal a double minimum for Ir(2)(dimen)(4)(2+) (~4.1 ? Ir-Ir with 0° twist angle and ~3.6 ? Ir-Ir with ±12° twist angle) but not for the rhodium analogue (~4.5 ? Rh-Rh with no twisting). Because both the ligand strain and A(2u) distortional energy are virtually identical for the two complexes, the strength of the metal-metal interaction is the determining factor. On the basis of the magnitude of this interaction, we obtain the following results: (1) a single-minimum (along the Ir-Ir coordinate), harmonic potential-energy surface for the triplet electronic excited state of Ir(2)(dimen)(4)(2+) (R(e,Ir-Ir) = 2.87 ?; F(Ir-Ir) = 0.99 mdyn ?(-1)); (2) a single-minimum, anharmonic surface for the ground state of Rh(2)(dimen)(4)(2+) (R(e,Rh-Rh) = 3.23 ?; F(Rh-Rh) = 0.09 mdyn ?(-1)); (3) a double-minimum (along the Ir-Ir coordinate) surface for the ground state of Ir(2)(dimen)(4)(2+) (R(e,Ir-Ir) = 3.23 ?; F(Ir-Ir) = 0.16 mdyn ?(-1)). 相似文献