In this work,we study the structural changes of the polar[NH4][Cd(HCOO)3]hybrid perovskite under external hydrostatic pressure.We report a reversible framework rearrangement as a function of pressure characterized by:...In this work,we study the structural changes of the polar[NH4][Cd(HCOO)3]hybrid perovskite under external hydrostatic pressure.We report a reversible framework rearrangement as a function of pressure characterized by:(i)a gradual modification of one formate ligand,which changes its coordination mode from a bridging syn–anti mode at atmospheric pressure(LP-phase)to a chelating-anti mode at high-pressure(HP-phase)and(ii)a change in the coordination of the Cd2+cations from six-coordinated(LP-phase)to hepta-coordinated(HP-phase).Very interestingly,this unprecedented framework arrangement displays a large electrical polarization.For instance,the polarization value observed at p=17.7 GPa is about four times the polarization at atmospheric pressure.Therefore,we report that the external pressure induces a novel framework rearrangement in the polar[NH4][Cd(HCOO)3]hybrid perovskite with enhanced electrical polarization.This structure–property relationship offers new insights for designing novel ferroelectric materials based on pressure-responsive hybrid perovskite materials.展开更多
METHANOL is a chemical manufactured world-wide and its production is of interest from bothindustrial and academic points of view. It is used as gasoline extenders and in the manufac-ture of methyl tetra-butyl ether wh...METHANOL is a chemical manufactured world-wide and its production is of interest from bothindustrial and academic points of view. It is used as gasoline extenders and in the manufac-ture of methyl tetra-butyl ether which is used as an octane enhancer in gasoline. The search forpotential additives has been carried out since the discovery of the promoting effect. In thisnote, we report the promoting effect of Mn on Cu-Zn-Al catalyst. The results indicated展开更多
We herein reported a design strategy for the construction of resorcin[4]arene-based metal–organic complexes through adjusting auxiliary linkers.By precisely tuning 1,4-benzenedicarboxylic acid analogs,a series of iso...We herein reported a design strategy for the construction of resorcin[4]arene-based metal–organic complexes through adjusting auxiliary linkers.By precisely tuning 1,4-benzenedicarboxylic acid analogs,a series of isostructural resorcin[4]arene-based metal–organic dimers,namely,[Zn_(4)(TIC_(4)R)_(2)·(L)2·(OH)_(2)]·2HCOO·solvent(1–9)(L=1,4-benzenedicarboxylic acid analogs and TIC4R=tetra(imidazole)resorcin[4]arene),were rationally prepared under solvothermal conditions.Considering the amino groups on the backbone of dimer 2,Pd nanoparticles were prepared to uniformly disperse on the substrate of 2 to give Pd@2.Most importantly,the Pd@2 catalyst was applied for nitroarene hydrogenation with efficient catalytic performance and high selectivity under mild conditions.This work afforded a possible method for precisely controlling the target complex assemblies and their further application.展开更多
基金supported by the Ministerio de Economía y Competitividad(MINECO)and EU-FEDER under the projects[CSD2007-00045,CTQ2015-67755-C2-1-R and MAT2017-86453-R]Ministerio de Ciencia,Innovación y Universidades(MICINN)and EU-FEDER under the project PGC2018-094814-B-C21Xunta de Galicia under the project ED431C2018/39.
文摘In this work,we study the structural changes of the polar[NH4][Cd(HCOO)3]hybrid perovskite under external hydrostatic pressure.We report a reversible framework rearrangement as a function of pressure characterized by:(i)a gradual modification of one formate ligand,which changes its coordination mode from a bridging syn–anti mode at atmospheric pressure(LP-phase)to a chelating-anti mode at high-pressure(HP-phase)and(ii)a change in the coordination of the Cd2+cations from six-coordinated(LP-phase)to hepta-coordinated(HP-phase).Very interestingly,this unprecedented framework arrangement displays a large electrical polarization.For instance,the polarization value observed at p=17.7 GPa is about four times the polarization at atmospheric pressure.Therefore,we report that the external pressure induces a novel framework rearrangement in the polar[NH4][Cd(HCOO)3]hybrid perovskite with enhanced electrical polarization.This structure–property relationship offers new insights for designing novel ferroelectric materials based on pressure-responsive hybrid perovskite materials.
文摘METHANOL is a chemical manufactured world-wide and its production is of interest from bothindustrial and academic points of view. It is used as gasoline extenders and in the manufac-ture of methyl tetra-butyl ether which is used as an octane enhancer in gasoline. The search forpotential additives has been carried out since the discovery of the promoting effect. In thisnote, we report the promoting effect of Mn on Cu-Zn-Al catalyst. The results indicated
基金supported by the Science and Technology Research Planning Project of the Education Department of Jilin Province(Grant No.JJKH20231297KJ)the Open Project Program of the Key Laboratory of Preparation and Application of Environmental Friendly Materials,Ministry of Education,China(No.2020006).
文摘We herein reported a design strategy for the construction of resorcin[4]arene-based metal–organic complexes through adjusting auxiliary linkers.By precisely tuning 1,4-benzenedicarboxylic acid analogs,a series of isostructural resorcin[4]arene-based metal–organic dimers,namely,[Zn_(4)(TIC_(4)R)_(2)·(L)2·(OH)_(2)]·2HCOO·solvent(1–9)(L=1,4-benzenedicarboxylic acid analogs and TIC4R=tetra(imidazole)resorcin[4]arene),were rationally prepared under solvothermal conditions.Considering the amino groups on the backbone of dimer 2,Pd nanoparticles were prepared to uniformly disperse on the substrate of 2 to give Pd@2.Most importantly,the Pd@2 catalyst was applied for nitroarene hydrogenation with efficient catalytic performance and high selectivity under mild conditions.This work afforded a possible method for precisely controlling the target complex assemblies and their further application.
