The family of[M(dmit)_(2)]-salts(dmit2-=2-thioxo-1,3-dithiole-4,5-dithiolate;M=Ni,Pd and Pt)generally show novel magnetic,elec-tric,magnetoelectric and photoelectric properties.Herein,a blockwall-type layered[Me3S][Ni...The family of[M(dmit)_(2)]-salts(dmit2-=2-thioxo-1,3-dithiole-4,5-dithiolate;M=Ni,Pd and Pt)generally show novel magnetic,elec-tric,magnetoelectric and photoelectric properties.Herein,a blockwall-type layered[Me3S][Ni(dmit)_(2)]radical salt(1;Me3S+=trime-thylsulfonium)was prepared and characterized by microanalysis,IR spectroscopy,thermal analysis,powder and single crystal X-ray diffraction techniques.Salt 1 crystalizes in triclinic space group P-1,with two pairs of[Ni(dmit)_(2)]-and Me3S+ions in an asymmetric unit.The anions form blockwall-type monolayer,being parallel to crystallographic(011)plane,and the cations are accommodated in the spaces of anion monolayer.Salt 1 features a two-dimensional S=1/2 antiferromagnetic(AFM)spin system withθ=-97.8(1)K and a semiconductor withσ≈10-4 S·cm^(-1) and activation energy Ea=0.24(1)eV in 308-368 K.1 shows two-step dielectric relaxa-tions ranged from 173-373 K and 1-107 Hz for the dipole motions of two different polar cations.Most importantly,the dielectric constant of 1 reaches to~17,with high-κnature.This study suggests the possibility of achieving high-K materials by introducing po-lar and low rotation barrier components into van der Waals crystal and high-K[Ni(d m it)_(2)]--based electrode materials for applications in supercapacitors.展开更多
基金supported by the Priority Academic Program Development of Jiangsu Higher Education Institutions and the National Natural Science Foundation of China(21801218 and 22073047).
文摘The family of[M(dmit)_(2)]-salts(dmit2-=2-thioxo-1,3-dithiole-4,5-dithiolate;M=Ni,Pd and Pt)generally show novel magnetic,elec-tric,magnetoelectric and photoelectric properties.Herein,a blockwall-type layered[Me3S][Ni(dmit)_(2)]radical salt(1;Me3S+=trime-thylsulfonium)was prepared and characterized by microanalysis,IR spectroscopy,thermal analysis,powder and single crystal X-ray diffraction techniques.Salt 1 crystalizes in triclinic space group P-1,with two pairs of[Ni(dmit)_(2)]-and Me3S+ions in an asymmetric unit.The anions form blockwall-type monolayer,being parallel to crystallographic(011)plane,and the cations are accommodated in the spaces of anion monolayer.Salt 1 features a two-dimensional S=1/2 antiferromagnetic(AFM)spin system withθ=-97.8(1)K and a semiconductor withσ≈10-4 S·cm^(-1) and activation energy Ea=0.24(1)eV in 308-368 K.1 shows two-step dielectric relaxa-tions ranged from 173-373 K and 1-107 Hz for the dipole motions of two different polar cations.Most importantly,the dielectric constant of 1 reaches to~17,with high-κnature.This study suggests the possibility of achieving high-K materials by introducing po-lar and low rotation barrier components into van der Waals crystal and high-K[Ni(d m it)_(2)]--based electrode materials for applications in supercapacitors.
