The development of tin-based devices with low toxicity is critical for the commercial viability of perovskite solar cells.However because tin halide is a stronger Lewis acid,its crystallization rate is extremely fast,...The development of tin-based devices with low toxicity is critical for the commercial viability of perovskite solar cells.However because tin halide is a stronger Lewis acid,its crystallization rate is extremely fast,resulting in the formation of numerous defects that affect the device performance of tin-based perovskite solar cells.Herein,propylamine hydrobromide(PABr)was added to the perovskite precursor solution as an additive to passivate defects and fabricate more uniform and dense perovskite films.Because propylamine cations are too large to enter the perovskite lattices,they only exist at the grain boundary to passivate surface defects and promote crystal growth in a preferred orientation.The PABr additive raises the average short-circuit current density from 19.45 to 25.47 mA·cm^(-2)by reducing carrier recombination induced by defects.Furthermore,the device’s long-term illumination stability is improved after optimization,and the hysteresis effect is negligible.The addition of PABr results in a power conversion efficiency of 9.35%.展开更多
A new dinuclear copper(II) complex (Cu(C12H17N2O)(NCS)2, C26H34Cu2N6O2S2) has been synthesized and characterized by X-ray structure determination. It crystallizes in the triclinic system, space group P1 with a = 11....A new dinuclear copper(II) complex (Cu(C12H17N2O)(NCS)2, C26H34Cu2N6O2S2) has been synthesized and characterized by X-ray structure determination. It crystallizes in the triclinic system, space group P1 with a = 11.289(2), b = 12.071(2), c = 12.113(2) ?, α = 72.90(3), β = 83.76(3), γ = 65.60(3)°, V = 1436.7(5) ?3, Z = 2, Mr = 653.79, F(000) = 676, Dc = 1.511 g/cm3, μ(MoKα) = 1.660 mm?1, the final R = 0.0334 and wR = 0.0856 for 5047 observed reflections (I > 2σ(I)). The asymmetric unit comprises two half-molecules. The complex is a centrosymmetric dimmer in which each copper(II) is coordinated in the equatorial plane to the N-(salicylidene)-3- dimethylaminopropylamine ligand through the deprotonated phenolic oxygen atom as well as the nitrogen atoms of imine and amine. The fourth coordination site is occupied by the nitrogen atom of NCS?, while the axial one by the symmetrically related phenoxy oxygen of the other monomeric unit. The Cu(II)…Cu(II) average distance is 3.110(1) ?.展开更多
The title compound （Z）-ethyl-4-（4-methoxy）benzylidene-2-（3,5-dimethoxyphenyl）- tetrahydrofuran-3,3-dicarboxylate has been synthesized, and its crystal structure was characterized by X-ray single-crystal diffract...The title compound （Z）-ethyl-4-（4-methoxy）benzylidene-2-（3,5-dimethoxyphenyl）- tetrahydrofuran-3,3-dicarboxylate has been synthesized, and its crystal structure was characterized by X-ray single-crystal diffraction. The crystal belongs to triclinic, space group P1, with a = 8.140（3）, b = 11.966（4）, c = 13.771（5）Aα= 67.366（4）, β= 85.165（5）, γ= 75.806（4）°, V = 1200.1（7） A3, Z = 2, C26H3008, Mr = 470.50, Dc = 1.302 g/cm^3, F（000） = 500,λ（MoKa） = 0.71073 A, μ= 0.096 mm^-1, R = 0.0659 and wR = 0.1841 for 3080 observed reflections （I 〉 2σ（I））. As a key intermediate of HIV-1 integrase inhibitor, the synthesis and structure confirmation of the title compound are important for further studies.展开更多
The racemic amine (±)-2-methyl-1-phenyl propylamine(4)was obtained from benzene(1)and isobutyryl chloride(2).Enantiomers of(4)(up to 99%e.e.)were resolved with(S)-(+)-mandelic acid[(+)-(5)]and(R)-(-)-mandelic aci...The racemic amine (±)-2-methyl-1-phenyl propylamine(4)was obtained from benzene(1)and isobutyryl chloride(2).Enantiomers of(4)(up to 99%e.e.)were resolved with(S)-(+)-mandelic acid[(+)-(5)]and(R)-(-)-mandelic acid[(-)-(5)]as resolving reagents in a mixed solvent of ethyl acetate/hexane.The struchure of (4)was characterized by IR,NMR and MS spectra.展开更多
基金supported by the Talent Fund of Beijing Jiaotong University (No.2019RC058)the National Natural Science Foundation of China (Nos.62205013,62075009,62275013,and 12274020)。
文摘The development of tin-based devices with low toxicity is critical for the commercial viability of perovskite solar cells.However because tin halide is a stronger Lewis acid,its crystallization rate is extremely fast,resulting in the formation of numerous defects that affect the device performance of tin-based perovskite solar cells.Herein,propylamine hydrobromide(PABr)was added to the perovskite precursor solution as an additive to passivate defects and fabricate more uniform and dense perovskite films.Because propylamine cations are too large to enter the perovskite lattices,they only exist at the grain boundary to passivate surface defects and promote crystal growth in a preferred orientation.The PABr additive raises the average short-circuit current density from 19.45 to 25.47 mA·cm^(-2)by reducing carrier recombination induced by defects.Furthermore,the device’s long-term illumination stability is improved after optimization,and the hysteresis effect is negligible.The addition of PABr results in a power conversion efficiency of 9.35%.
文摘A new dinuclear copper(II) complex (Cu(C12H17N2O)(NCS)2, C26H34Cu2N6O2S2) has been synthesized and characterized by X-ray structure determination. It crystallizes in the triclinic system, space group P1 with a = 11.289(2), b = 12.071(2), c = 12.113(2) ?, α = 72.90(3), β = 83.76(3), γ = 65.60(3)°, V = 1436.7(5) ?3, Z = 2, Mr = 653.79, F(000) = 676, Dc = 1.511 g/cm3, μ(MoKα) = 1.660 mm?1, the final R = 0.0334 and wR = 0.0856 for 5047 observed reflections (I > 2σ(I)). The asymmetric unit comprises two half-molecules. The complex is a centrosymmetric dimmer in which each copper(II) is coordinated in the equatorial plane to the N-(salicylidene)-3- dimethylaminopropylamine ligand through the deprotonated phenolic oxygen atom as well as the nitrogen atoms of imine and amine. The fourth coordination site is occupied by the nitrogen atom of NCS?, while the axial one by the symmetrically related phenoxy oxygen of the other monomeric unit. The Cu(II)…Cu(II) average distance is 3.110(1) ?.
基金supported by the National Natural Science Foundation of China (No. 30572238)
文摘The title compound （Z）-ethyl-4-（4-methoxy）benzylidene-2-（3,5-dimethoxyphenyl）- tetrahydrofuran-3,3-dicarboxylate has been synthesized, and its crystal structure was characterized by X-ray single-crystal diffraction. The crystal belongs to triclinic, space group P1, with a = 8.140（3）, b = 11.966（4）, c = 13.771（5）Aα= 67.366（4）, β= 85.165（5）, γ= 75.806（4）°, V = 1200.1（7） A3, Z = 2, C26H3008, Mr = 470.50, Dc = 1.302 g/cm^3, F（000） = 500,λ（MoKa） = 0.71073 A, μ= 0.096 mm^-1, R = 0.0659 and wR = 0.1841 for 3080 observed reflections （I 〉 2σ（I））. As a key intermediate of HIV-1 integrase inhibitor, the synthesis and structure confirmation of the title compound are important for further studies.
文摘The racemic amine (±)-2-methyl-1-phenyl propylamine(4)was obtained from benzene(1)and isobutyryl chloride(2).Enantiomers of(4)(up to 99%e.e.)were resolved with(S)-(+)-mandelic acid[(+)-(5)]and(R)-(-)-mandelic acid[(-)-(5)]as resolving reagents in a mixed solvent of ethyl acetate/hexane.The struchure of (4)was characterized by IR,NMR and MS spectra.
