Showing papers by "Jiang-Gao Mao published in 2007"
TL;DR: In this paper, two types of synthetic techniques were applied: attaching various functional groups or introducing a second metal linker to the phosphonate ligand, lanthanide phosphonates with 0D, 1D, 2D and 3D structures have been isolated.
353 citations
TL;DR: Magnetic property measurements indicate that there exist weak antiferromagnetic interactions between magnetic centers in all six compounds.
Abstract: Hydrothermal reactions of manganese(II) salts with m-sulfophenylphosphonic acid (m-HO3S-Ph-PO3H2, H3L) and 1,10-phenanthroline (phen) led to six novel manganese(II) sulfonate-phosphonates, namely, [Mn-2(HL)(2)(phen)(4)][Mn-2(HL)(2)(phen)(4)(H2O)](2)center dot 6H(2)O (1), [Mn-4(L)(2)(phen)(8)(H2O)(2)][ClO4](2)center dot 3H(2)O (2), [Mn(phen)(H2O)(4)](2)[Mn-4(L)(4)(phen)(4)]center dot 10H(2)O (3), [Mn-6(L)(4)(phen)(8)(H2O)(2)]center dot 4H(2)O (4), [Mn-6(L)(4)(phen)(8)(H2O)(2)]center dot 24H(2)O (5), and [Mn-6(L)(4)(Phen)(6)(H2O)(4)]center dot 5H(2)O (6). The structure of 1 contains two types of dinuclear manganese(II) clusters, and 2-3 exhibit two types of tetranuclear manganese(II) cluster units. 4-5 feature two different types of isolated hexanuclear manganese(II) clusters, whereas the hexanuclear manganese(II) clusters in 6 are bridged by sulfonate-phosphonate ligands into a 1D chain. Magnetic property measurements indicate that there exist weak antiferromagnetic interactions between magnetic centers in all six compounds.
66 citations
TL;DR: In this paper, a 3D network based on 1D chains of [Cd-3(L)(2)] cross-linked by 4,4'-bipy ligands was proposed.
Abstract: Hydrothermal reactions of cadmium(II) salt with m-phosphonophenylsulfonic acid (H3L) and 1,10-phenanthroline (phen) or 4,4'-bipyridine (bipy) led to three novel cadmium(II) phosphonatephenylsulfonates, namely, [Cd-4(L)(2)(phen)(6)(Cl)(2)(H2O)(2)]center dot 14H(2)O (1), [Cd-6(L)(4)(phen)(8)]center dot 14H(2)O (2), and [Cd-3(L)(2)(bipy)(3)(H2O)(6)]center dot 4H(2)O (3). Compound 1 contains a tetranuclear cadmium(II) cluster in which four cadmium(II) ions are bridged by two tetradentate phosphonate groups. Compound 2 features a hexanuclear cadmium(II) cage in which six cadmium(II) ions are bridged by one tetradentate and three pentadentate phosphonate groups. The structure of compound 3 features a novel 3D network based on 1D chains of [Cd-3(L)(2)] cross-linked by 4,4'-bipy ligands; its topological structure is similar to that of CdSO4. Compounds 1-3 exhibit broad blue fluorescence emission bands at 408, 410, and 396 nm, respectively.
64 citations
TL;DR: In this article, a 3D framework with rarely observed topology in which each lanthanum(III) ion is eight-coordinated by seven phosphonic oxygen atoms from four phosphonate ligands and an aqua ligand was presented.
Abstract: Hydrothermal reactions of lanthanide(III) salts with N-(2-pyridyl)-aminomethane-1,1-diphosphonic acid (H4L) led to five new lanthanide(III) phosphonates, namely, La4(H2L)4(H3L)4(H2O)4·20H2O (1) and Ln(H2L)(H3L)·4H2O (Ln = Eu (2), Gd (3), Dy (4), and Er (5)) Compound 1 features a 3D framework with rarely observed topology in which each lanthanum(III) ion is eight-coordinated by seven phosphonic oxygen atoms from four phosphonate ligands and an aqua ligand It possesses two types of tunnels running parallel to the a-axis, one formed by five La(III) ions and five organic moieties, the other by seven La(III) ions and seven organic moieties It shows noninterpenetrated three-connected topology Compounds 2−5 are isostructural and exhibit one-dimensional chain structures in which each pair of Ln(III) ions are bridged by two and four phosphonate groups, alternatively Compound 2 exhibits emission bands of the phosphonate ligand and the europium(III) ion in the visible region under 360 nm excitation, with a Eu (
56 citations
TL;DR: The results of magnetic property measurements indicate that there are considerable ferromagnetic interactions between nickel(II) centers in both compounds.
Abstract: Two new nickel(II) molybdenum(VI) selenium(IV) and tellurium(IV) oxides generally formulated as Ni3(Mo2O8)(XO3) (X = Se, Te) have been synthesized by solid-state reactions of NiO, MoO3, and SeO2 (or TeO2). Both compounds feature 3D network structures built of [Mo4O16]8- tetranuclear cluster units and 2D nickel(II) selenite or tellurite layers. The nickel(II) selenite layer in Ni3(Mo2O8)(SeO3) is formed by [Ni6O22]32- hexanuclear clusters interconnected by selenite groups whereas the thick nickel(II) tellurite layer in Ni3(Mo2O8)(TeO3) is constructed by corrugated nickel(II) oxide chains bridged by the tellurite groups. The results of magnetic property measurements indicate that there are considerable ferromagnetic interactions between nickel(II) centers in both compounds. Their optical properties and band structures have been also studied.
35 citations
TL;DR: In this paper, the lead-II sulfonate-phosphonates have been characterized and structurally characterized, and the first zero-dimensional lead(II) phosphonates with strong broad blue fluorescent emission bands are presented.
Abstract: Five new lead(II) sulfonate-phosphonates, namely [Pb(3)(L)(2)(H(2)O)(2)]center dot 4H(2)O (1), [Pb(HL)(phen)]center dot H(2)O (2), [Pb(6)(L)(4)(phen)(8)]center dot 3H(2)O (3), [Pb(6)(L)(4)(phen)(10)]center dot 2H(2)O (4), and [Pb(6)(L)(4)(4,4'-bipy)(H(2)O)(2)]center dot 2H(2)O (5; H(3)L = m-HO(3)S-C(6)H(4)-PO(3)H(2), phen = 1,10-phenanthroline, 4,4'-bipy = 4,4'-bipyridine) have been prepared and structurally characterized. Compound I features a novel 3D framework in which 1D chains of Pb(3)O(4) cluster units are further bridged by sulfonate-phosphonate ligands, whereas compound 2 features a layer structure in which 1D chains of Pb(2)O(4) clusters are further bridged by sulfonate-phosphonate ligands. Compounds 3 and 4 represent the first zero-dimensional lead(II) phosphonates and feature novel isolated hexanuclear lead(II) clusters in which six Pb(II) ions are bridged by two tetradentate and two pentadentate phosphonate groups. Compound 5 features a 3D framework that is similar to that in compound 1 despite the different coordination modes for some sulfonate groups of the ligands. The main difference is that an aqua ligand in compound 1 is replaced by a nitrogen atom of the 4,4'-bipy ligand, which results in the splitting of the large cavities in compound I into two small apertures in compound 5. Compounds 1 and 5 exhibit strong broad blue fluorescent emission bands at 398 and 420 nm, respectively. ((c) Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheirn, Germany, 2007).
34 citations
TL;DR: Luminescent studies indicate that Pr2(MoO 4)(Te4O10) and Pr5(MO4)(Te5O13)(TeO3)2Cl3 (M = Mo, W) are able to emit blue, green, and red light, whereas Nd2 (MoO4).
Abstract: Solid-state reactions of lanthanide(III) oxide (and/or lanthanide(III) oxychloride), MoO3 (or WO3), and TeO2 at high temperature lead to eight new luminescent compounds with four different types of...
32 citations
TL;DR: In this article, a new quaternary lanthanide alkaline-earth tellurium(IV) oxide, La2Ba(Te3O8)(TeO3)(2), has been prepared by the solid-state reaction and structurally characterized.
30 citations
TL;DR: In this article, three new organically bonded indium(III) selenates or selenites, namely, In-2(2,2 '-bipy)(2)(SeO4)(3)(H2O)(2)center dot 0.5H(2)O (2)
22 citations
TL;DR: The first organically templated gallium and indium selenites or selenates have been synthesized by hydro/solvothermal methods and structurally characterized.
Abstract: The first organically templated gallium and indium selenites or selenates have been synthesized by hydro/solvothermal methods and structurally characterized. The structure of [H(2)DABCO][Ga2F6(SeO3)] (1) (DABCO = triethylenediamine) features a one-dimensional (1D) [Ga2F6(SeO3)](2-) chain built from Ga3F3 trinuclear units each capped by a selenite group. The isostructural compounds [H(2)en][MF3(SeO3)] (en = ethylenediamine; M = Ga (2), In(3)) contain two-dimensional (2D) inorganic layers of [MF3(SeO3)](2-) anions (M = Ga, In). The structure of [H(2)pip][GaF(SeO3)(C2O4)]center dot H2O (4) (pip = piperazine) features a 1D inorganic-organic hybrid chain of [GaF(SeO3)(C2O4)](2-) anions in which the oxalate anion is bidentate chelating and the selenite anion is tridentate bridging. The structure of [H(2)DABCO](2)[Ga4F2(SeO3)(6)(C2O4)]center dot 4H(2)O (5) exhibits a three-dimensional (3D) pillared layered architecture in which the fluorinated gallium selenite layers are further interconnected by bridging oxalate anions (the pillar). [H(2)en][InF3(SeO4)] (6) features a 1D inorganic chain of [InF3(SeO4)](2-) anions. The structure of the indium oxalate-selenate, [H(2)en](0.5)[In(SeO4)(C2O4)(H2O)(2)] (7), contains a 1D [In(SeO4)(C2O4)(H2O)(2)](2-) anionic chain. The template cations in all compounds are located at structural voids and are involved in hydrogen bonding (except in compound 4). Compounds 6 and 7 exhibit broad emission bands at 421 and 434 nm, respectively.
19 citations
TL;DR: Two new organically templated layered copper(I) sulfites, namely, {H2pip}{Cu3(CN)3(SO3)2Br(H2O)}.2H2 O (2) (pip = piperazine), have been synthesized by hydrothermal reactions of copper(i) cyanide or copper( I) bromide with NaHSO3 and piperazines.
Abstract: Two new organically templated layered copper(l) sulfites, namely, {H(2)PiP}{Cu-3(CN)(3)(SO3)}(1) and {H(2)PiP}- NaCu2(SO3)2Br(H2O)center dot 2H(2)O (2) (pip = piperazine), have been synthesized by hydrothermal reactions of copper(1) cyanide or copper(l) bromide with NaHSO3 and piperazine. Both compounds exhibit a layered structure. The 2D layer of { Cu-3(CN)(3)(SO3)(2-) in 1 is composed of 1 D chains of copper(l) cyanide interconnected by sulfite anions via both Cu-S and Cu-O bonds, whereas the 2D layer of {NaCu2(SO3)(2)Br2- in 2 is formed by 1D chains of copper(l) bromide and 1D sodium(l) aqua chains that are interconnected by sulfite anions via Na-O, Cu-S, and Cu-O bonds. Chemical bonding in 1 and 2 has been also investigated by theoretical calculations based on DFT methods.
TL;DR: Two homochiral metal amino-carboxylate-phosphonate hybrids, namely, [Co(2)Cl(S-HL) as discussed by the authors and [S-H(3)L] have been synthesized by the reaction of the enantiopure S-H-3]L ligand with cobalt(II) chloride or strontium nitrate under acidic condition at room temperature.
TL;DR: Two ternary alkali earth silver bismuthides, CaAgBi and BaAg1.837Bi2, have been synthesized by solid-state reactions of the corresponding metals in welded Nb tubes at high temperature as mentioned in this paper.
TL;DR: In this article, a series of new organically templated lanthanide oxalate-selenate hybrids with 2D-layer or 3D-network structures were established by X-ray single-crystal diffraction.
Abstract: Hydrothermal reactions of lanthanide nitrates with selenic acid, sodium oxalate, and organic amines led to two series of new organically templated lanthanide oxalate-selenate hybrids with 2D-layer or 3D-network structures, namely, Ln(2)(SeO4)(2)(C2O4)(H2O)(4)center dot pip (Ln = Eu 1; Tb 2; Dy 3; Er 4; Yb 5) (pip = piperazine) and [H(2)PiP](2)[Ln(2)(SeO4)(2)(C2O4)(3)]center dot H2O (Ln = Er 6; Yb 7; Lu 8; Y 9). Their structures were established by X-ray single-crystal diffraction. Isostructural compounds 1-5 feature a 2D inorganic-organic hybrid neutral layer of Ln(2)(SeO4)(2)(C2O4)(H2O)(4). The neutral piperazine molecules are located at the interlayer spaces and interconnect with the inorganic skeleton through hydrogen bonds. Compounds 6-9 are isostructural and possess 3D pillared layered architectures composed of lanthanide oxalate layers bridged by selenate anions (the pillar). The template cations are located at the tunnels of the structure. Compounds 1, 2, and 3 display emission bands in the red-, green-, and pink-light regions, respectively, and these compounds have lifetimes of 0.178, 0.962, and 0.276 ms, respectively. Compounds 6 and 7 both exhibit emission bands in the near-IR region. ((c) Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007)
Journal Article•
TL;DR: In this paper, a new polar intermetallic compound, Eu3Sn5, has been synthesized by solid-state reaction of the corresponding pure elements in a stoichiometric ratio in a welded tantalum tube at high temperature.
TL;DR: Two new nickel(II) molybdenum(VI) selenium(IV) and tellurium (IV) oxides generally formulated as Ni3(Mo2O8)(XO3) (X = Se, Te) have been synthesized by solidstate reactions of NiO, MoO3, and SeO2 (or TeO2) as discussed by the authors.
Abstract: Two new nickel(II) molybdenum(VI) selenium(IV) and tellurium(IV) oxides generally formulated as Ni3(Mo2O8)(XO3) (X = Se, Te) have been synthesized by solid-state reactions of NiO, MoO3, and SeO2 (or TeO2). Both compounds feature 3D network structures built of [Mo4O16]8- tetranuclear cluster units and 2D nickel(II) selenite or tellurite layers. The nickel(II) selenite layer in Ni3(Mo2O8)(SeO3) is formed by [Ni6O22]32- hexanuclear clusters interconnected by selenite groups whereas the thick nickel(II) tellurite layer in Ni3(Mo2O8)(TeO3) is constructed by corrugated nickel(II) oxide chains bridged by the tellurite groups. The results of magnetic property measurements indicate that there are considerable ferromagnetic interactions between nickel(II) centers in both compounds. Their optical properties and band structures have been also studied.
TL;DR: In this paper, six new divalent metal selenites have been synthesized by hydro-/solvothermal methods which leads to the incorporation of the organic template as a cation or a ligand.
Abstract: Six new divalent metal selenites have been synthesized by hydro-/solvothermal methods which leads to the incorporation of the organic template as a cation or a ligand. The structure of [H(2)pip][Cu(SeO(3))(2)] (1) (pip=piperazine) features 1D anionic chains of [Cu(SeO(3))(2)](2-) which are cross-linked by the template cations through hydrogen bonds into a 2D layer. In [Cu(C(3)H(4)N(2))(SeO(3))] (2) the organic template is coordinated to the copper(II) ion of the inorganic Cu(SeO(3)) layer. The isostructural compounds [H(2)en][M(HSeO(3))(2)Cl(2)] (en=ethylenediamine; M=Cu (3), Co (4)) contain layers of [MCl(2)(HSeO(3))(2)](2-) units (M=Cu, Co), which are cross-linked by the template cations via hydrogen bonds into a 3D network. The structure of [H(2)en][Cu(2)(SeO(3))(2)(HSeO(3))](2)H(2)O (5), consists of a pillared layered architecture in which the Cu(SeO(3)) layers are further interconnected by bridging hydrogen selenite groups (the pillar). The compound [H(2)pip][Cu(2)(Se(2)O(5))(3)] (6), which crystallizes as a 3D open framework represents the first organically templated metal diselenite. These new compounds are thermally stable up to at least 170 degrees C. All of the compounds exhibit fairly strong antiferromagnetic interactions. More interestingly, compounds 3 and 4 behave as a weak ferromagnets below the critical temperatures of T(c)=12 and 8 K, respectively, and both of them exhibit spin-flop phase transitions around 800+/-100 Oe.
TL;DR: Two ternary alkali earth silver bismuthides, CaAgBi and BaAg1.837Bi2, have been synthesized by solid-state reactions of the corresponding metals in welded Nb tubes at high temperature.
Abstract: Two ternary alkali earth silver bismuthides, CaAgBi and BaAg1.837Bi2, have been synthesized by solid-state reactions of the corresponding metals in welded Nb tubes at high temperature. Their structures have been established by single-crystal X-ray diffraction studies. CaAgBi crystallizes in the hexagonal space group P63mc (No.186) with cell parameters of a = b = 4.8113(4) A, c = 7.8273(9) A, V = 156.92(3) A3, and Z = 2. BaAg1.837Bi2 belongs to tetragonal space group P4/nmm (No.129) with cell parameters of a = b = 4.9202(2) A, c = 11.628(1) A, V = 281.50(3) A3, and Z = 2. The structure of CaAgBi is of the LiGaGe type, and features a three-dimensional four-connected (3D4C) anionic network with Ca2+ encapsulated in the channels formed by [Ag3Bi3] six-membered rings. BaAg1.837Bi2 is isostructural with CaBe2Ge2, a variant of the tetragonal ThCr2Si2-type structure. Its structure exhibits a three-dimensional anionic network built of (0 0 1) and (0 0 2) puckered [Ag2Bi2] layers interconnected via additional Ag–Bi bonds along the c-axis. BaAg1.837Bi2 is metallic based on band structure calculations.
TL;DR: A new rare earth nickel stannide, Sm 2 NiSn 4, has been prepared by reacting the pure elements at high temperature in welded tantalum tubes as discussed by the authors, and its crystal structure was established by single crystal X-ray diffraction studies.
Abstract: A new rare earth nickel stannide, Sm 2 NiSn 4 , has been prepared by reacting the pure elements at high temperature in welded tantalum tubes. Its crystal structure was established by single crystal X-ray diffraction studies. Sm 2 NiSn 4 crystallizes in the orthorhombic space group Pnma (No. 62) with cell parameters of a =16.878(2) A, b =4.4490(7) A, c =8.915(1) A, and Z =4. Its structure can be viewed as the intermediate type between ZrSi 2 and CeNiSi 2 . Sm 2 NiSn 4 features two-dimensional (2D) corrugated [NiSn 4 ] 6− layers in which the 1D Sn zigzag chains and the 2D Sn square sheets are bridged by Ni atoms. The Sm 3+ cations are located at the interlayer space. Results of both resistivity measurements and extended-Huckel tight-binding band structure calculations indicate that Sm 2 NiSn 4 is metallic.