The reaction of Ni（CH3COO）2-4H2O, Na2MoO4·H2O, MoO3, 1,10-phenanthroline and 1,4-butylenediphosphonic acid in distilled water at 180℃ for 72 h produced two new compounds： {[Ni（1,10-phen）3][Ni（1,10-phen）2...The reaction of Ni（CH3COO）2-4H2O, Na2MoO4·H2O, MoO3, 1,10-phenanthroline and 1,4-butylenediphosphonic acid in distilled water at 180℃ for 72 h produced two new compounds： {[Ni（1,10-phen）3][Ni（1,10-phen）2（Mo6O18）（O3P（CH2）4PO3）]·6H2O}n 1 in 15% yield and {[Ni（1,10-phen）2（H2O）2] [Ni（1,10-phen）2 （H2O）（Mo5O15）（O3P（CH2）4PO3）]·6H2O} n 2 in 47% yield. 1 and 2 both feature {MonO3nO3P（CH2）4PO3}^4-（n=5, 6） 1-D anionic chain, which is further decorated and charge compensated by [Ni（1,10-phen）2]^2＋. 1 contains {Mo6O24P2} cluster constructed of three pairs of face-sharing {MoO6} octahedra linked through corner-sharing interaction. 2 exhibits the characteristic structure based on pentanuclear ring of comer- and edge-sharing {MoO6} octahedra capped by three oxygen atoms of {PO3} on each side. The thermogravimetric analyses and magnetic property of 2 were also studied.展开更多
The atomic structure of quasi one-dimensional(1D) van der Waals materials can be regarded as the stacking of atomic chains to form thin flakes or nanoribbons, which substantially differentiates them from typical two-d...The atomic structure of quasi one-dimensional(1D) van der Waals materials can be regarded as the stacking of atomic chains to form thin flakes or nanoribbons, which substantially differentiates them from typical two-dimensional(2D) layered materials and 1D nanotube/nanowire array. Here we present our studies on quasi 1D gold selenide(AuSe) that possesses highly anisotropic crystal structure, excellent electrical conductivity, giant magnetoresistance, and unusual reentrant metallic behavior. The low inplane symmetry of AuSe gives rise to its high anisotropy of vibrational behavior. In contrast, quasi 1D AuSe exhibits high in-plane electrical conductivity along the directions of both atomic chains and perpendicular one, which can be understood as a result of strong interchain interaction. We found that AuSe exhibits a near quadratic nonsaturating giant magnetoresistance of 1841% with the magnetic field perpendicular to its in-plane. We also observe unusual reentrant metallic behavior, which is caused by the carrier mismatch in the multiband transport. Our works help to establish fundamental understandings on quasi 1D van der Waals semimetallic AuSe and identify it as a new candidate for exploring giant magnetoresistance and compensated semimetals.展开更多
基金Supported by the State Key Laboratory of Structural Chemistry, the National Science and Technology of China (001CB1089), the Chinese Academy of Sciences (CAS), the National Natural Science Foundation of China (20273073, 20333070 and 90206040), Key Item of Science and Technology of Fujian Province (2004 1+201-2), the Science Foundation of CAS and Fujian Province (2002F014, 2003J042, 2004J041 and Z0513022)
文摘The reaction of Ni（CH3COO）2-4H2O, Na2MoO4·H2O, MoO3, 1,10-phenanthroline and 1,4-butylenediphosphonic acid in distilled water at 180℃ for 72 h produced two new compounds： {[Ni（1,10-phen）3][Ni（1,10-phen）2（Mo6O18）（O3P（CH2）4PO3）]·6H2O}n 1 in 15% yield and {[Ni（1,10-phen）2（H2O）2] [Ni（1,10-phen）2 （H2O）（Mo5O15）（O3P（CH2）4PO3）]·6H2O} n 2 in 47% yield. 1 and 2 both feature {MonO3nO3P（CH2）4PO3}^4-（n=5, 6） 1-D anionic chain, which is further decorated and charge compensated by [Ni（1,10-phen）2]^2＋. 1 contains {Mo6O24P2} cluster constructed of three pairs of face-sharing {MoO6} octahedra linked through corner-sharing interaction. 2 exhibits the characteristic structure based on pentanuclear ring of comer- and edge-sharing {MoO6} octahedra capped by three oxygen atoms of {PO3} on each side. The thermogravimetric analyses and magnetic property of 2 were also studied.
基金This work was supported by the Research Grant Council of Hong Kong(N_PolyU540/17)the Shenzhen Science and Technology Innovation Commission(JCYJ20180507183424383)the Hong Kong Polytechnic University(G-SB79 and G-YBPS).
文摘The atomic structure of quasi one-dimensional(1D) van der Waals materials can be regarded as the stacking of atomic chains to form thin flakes or nanoribbons, which substantially differentiates them from typical two-dimensional(2D) layered materials and 1D nanotube/nanowire array. Here we present our studies on quasi 1D gold selenide(AuSe) that possesses highly anisotropic crystal structure, excellent electrical conductivity, giant magnetoresistance, and unusual reentrant metallic behavior. The low inplane symmetry of AuSe gives rise to its high anisotropy of vibrational behavior. In contrast, quasi 1D AuSe exhibits high in-plane electrical conductivity along the directions of both atomic chains and perpendicular one, which can be understood as a result of strong interchain interaction. We found that AuSe exhibits a near quadratic nonsaturating giant magnetoresistance of 1841% with the magnetic field perpendicular to its in-plane. We also observe unusual reentrant metallic behavior, which is caused by the carrier mismatch in the multiband transport. Our works help to establish fundamental understandings on quasi 1D van der Waals semimetallic AuSe and identify it as a new candidate for exploring giant magnetoresistance and compensated semimetals.
