Jiu-Hui Liu

[Tb(pyrazinecarboxylic acid)3(H2O)2] · 6n H2O: Synthesis, structure and photoluminescence

Abstract A novel terbium compound [Tb(pyrazinecarboxylic acid)3(H2O)2]n · 6n H2O (1) has been prepared via hydrothermal reaction and structurally characterized by single-crystal X-ray diffraction. The crystal belongs to the orthorhombic, space group Pbca with a = 19.4112(7), b = 11.9345(4), c = 19.8507(7) Å, V = 4598.7(3) Å3, Z = 8, C15H25N6O14Tb, Mr = 672.33, Dc = 1.942 g/cm3, S = 1.052, μ(MoKα) = 3.159 mm–1, F(000) = 2672, R = 0.0190 and wR = 0.0423. Compound 1 features an infinite 1-D chain-like structure with the terbium ions coordinating to six oxygen and three nitrogen atoms to give a distorted monocapped square antiprism. The [Tb(pyrazinecarboxylic acid)3(H2O)2]n chains and the lattice water molecules link to each other through π–π interactions and hydrogen bonding interactions to construct a 3-D supramolecular network. Photoluminescent investigation reveals that the title compound displays strong emissions that are attributed to the characteristic emissions of 5D4 → 7FJ (J = 3, 4, 5, 6) of Tb3+ ions.

Structural and photoluminescent investigations on a zinc porphyrin

The first crystalline TPPS complex [Zn(en)TPPS][Zn(en)3] (where en is ethylenediamine and TPPS is tetraphenylporphyrin tetrasulfonic acid) has been synthesised via a solvothermal reaction and structurally characterised by a single-crystal X-ray diffraction. Zn(en)TPPS][Zn(en)3 has discrete [Zn(en)TPPS]2– and [Zn(en)3]2+ moieties, which are interconnected via hydrogen bonds to form a three-dimensional supramolecular framework that possesses a large void space (1507.6 Å3) corresponding to 22.5% of the unit-cell volume. The UV-Vis spectrum and photoluminescence have also been studied in detail.

Syntheses, structures and photoluminescence of a series of transition metal-cyanopyridine polymers

A series of transition metal-n cyanopyridines (i.e. pyridine-n-carbonitrile; n = 2, 3, 4) complexes with one-dimensional (1-D) structures, [CuCl2(pyridine-3-carbonitrile)2] n , [CuCl2(pyridine-4-carbonitrile)2] n and [CoCl2(pyridine-4-carbonitrile)2] n , have been synthesised via hydrothermal reactions and structurally characterised by single-crystal X-ray diffraction. All these complexes feature infinite 1-D chain-like structures. Photoluminescent investigation reveals that the title complexes display strong emissions which may originate from π→π* charge-transfer interaction of the ligands.

Synthesis, structure, and properties of [Gd(C6NO2H5)3(H2O)2]2 n · ( n H5O2)( n ZnCl5)(2 n ZnCl4) · (2 n H2O) with strong fluorescence

A 1-D metal-isonicotinato inorganic–organic hybrid complex [Gd(C6NO2H5)3(H2O)2]2 n · (nH5O2)(nZnCl5)(2nZnCl4) · (2nH2O) (1) has been synthesized via hydrothermal reaction and structurally characterized by single-crystal X-ray diffraction. Complex 1 is a 1-D polycationic chain-like structure with unprecedented . Optical absorption spectra of 1 reveal the presence of an optical gap of 3.35 eV. Photoluminescence investigations reveal that the complex 2 display a strong blue-light fluorescent emission band.

Synthesis, structure and property of a metal sulfochloride–Hg 3 S 2 Cl 2

The compound [Hg3S2CI2] has been obtained by solid-state reactions. It crystallises in the acentric space group R3 of the rhombohedral system with six formula units in a cell [a = b = 12.654(3), c = 7.753(4) Å, V = 1075.1(6) Å3, CI2Hg3S2, M r = 736.79, D c = 6.828 g cm−3, S = 0.987, μ(MoKα) = 65.308 mm−1, F(000) = 1836, R = 0.0631 and wR = 0.1443] and is characterised by a 3-D framework structure, which is composed of interconnected right-handed helices formed by tetrahedral Hg atoms. Optical absorption spectra reveal the presence of an optical bandgap of 2.51 eV and the composition Hg3S2CI2 is confirmed by semiquantitative microscope analysis.

A novel 2-D 5d-4f-3d trimetal-isonicotinic acid complex: synthesis and characterisation

A novel trimetallic–isonicotinic acid complex [Zn0.5(H2O)]{(Hg2Cl5)[Eu(C6NO2H4)3(H2O)2]}(HgCl2)·H2O (1) has been synthesised and structurally characterised by single-crystal X-ray diffraction. Complex 1 features a novel 2-D {(Hg2Cl5)[Eu(C6NO2H4)3(H2O)2]} layer constructed from [Eu(C6NO2H4)3(H2O)2] chains interconnected by Hg2Cl5- linkers. The 2-D {(Hg2Cl5)[Eu(C6NO2H4)3(H2O)2]} layers are held together via hydrogen bonds and π–π interactions to yield a 3-D supramolecular framework with the lattice water molecules, the mercury chloride and the hydrated zinc ions located in the cavities.

Synthesis, Structure, Photoluminescence and Theoretical Study of {(N,N'-Dimethyl- 4,4'-bipyridinium)(Cd2(μ2-Cl)4Cl2)}n with N,N'-Dimethyl-4,4'-bipyridinium Generated in Situ

The title complex, (N,N′-dimethyl-4,4′-bipyridinium)[Cd2(μ2-Cl)4Cl2]n (1), in which the N,N′-dimethyl-4,4′-bipyridinium was generated in situ, was synthesized via hydrothermal reaction. X-Ray diffraction analysis revealed that the structure of 1 consisted of MV2+ (MV2+ = N,N′-dimethyl-4,4′-bipyridinium) cationic moieties and infinite [Cd2(μ2-Cl)4Cl2]n anionic chains. The cadmium atom was bound by one terminal chlorine atom and four μ2-bridging chlorine atoms, yielding a slightly distorted triangular bipyramid. Photoluminescent investigation revealed that the complex displayed an emission in greenish blue region.

Hydrothermal Synthesis, Crystal Structure and Photoluminescence of (HgCl2(C6NO2H5))nn(HgCl2)n(C6NO2H5)

The first example of isonicotinic acid compounds with infinite mercury halide chains, [HgCl2(C6NO2H5)]nn[HgCl2]n(C6NO2H5) (1), was synthesized through hydrothermal reactions and structurally characterized by X-ray single crystal diffraction. Compound 1 features a one-dimensional (1-D) motif, based on infinite 1-D [HgCl2(C6NO2H5)]n chains, neutral HgCl2 moieties and isolated isonicotinic acid molecules. The [HgCl2(C6NO2H5)]n chains, HgCl2 moieties and isonicotinic acid molecules are interlinked by hydrogen bonds and π-π interactions to give a two-dimensional supramolecular layer. Photoluminescent investigation reveals that the title compound exhibits a strong emission in blue region. The emission band is identified as the π -π* transitions of the isonicotinic acid moieties.

Synthesis, structure and photoluminescence of N-ethyl-4,4 '-bipyridinium CdBr4 with N-ethyl-4,4 '-bipyridinium generated in situ

A new viologen(4,4′-bipyridinium)-based complex [N-ethyl-4,4′-bipyridinium][CdBr4], in which N-ethyl-4,4′-bipyri-dinium (EQ2+) has been generated in situ, has been synthesised via hydrothermal reaction and structurally characterised by single-crystal X-ray diffraction. [N-ethyl-4,4′-bipyridinium][CdBr4] features an isolated structure, based on an N-ethyl-4,4′-bipyridinium moiety and a cadmium atom terminally bound by four bromine atoms. Photoluminescence investigation reveals a broad and intense emission in blue region, which may originated from π → π* charge-transfer interaction of the N-ethyl-4,4′-bipyridinium moiety.

Synthesis, crystal structure and properties of [Gd(C 6 NO 2 H 5 ) 3 (H 2 O) 2 ] n (1.5 n ZnCl 4 )· n H 2 O with unprecedented poly-cationic chains

A new heterometallic 4f-3d inorganic-organic metal-nicotinic acid complex [Gd(C6NO2H5)3(H2O)2] n (1.5nZnCl4)nH2O, (1), has been synthesised via hydrothermal reaction and structurally characterised. Complex 1 crystallises in the space group P21/c of the monoclinic system with four formula units in a cell: a = 9.524(2), b = 20.888(4), c = 16.078(3) Å β = 104.745(2)°, V= 3093.2(9) Å3, C18H21Cl6GdN3O9Zn1.50, M r =891.38 g/mol, D c = 1.914 g/cm3, S = 0.997, μ(MoKα) = 3.844 mm1, F(000) = 1732, R = 0.0493 and wR = 0.1350. Complex 1 is characteristic of a one-dimensional polycationic chain-like structure. Photoluminescent investigation shows that the title complex displays strong emission in the blue region, which is attributed to the intraligand π–π* transition of nicotinic ligands. Optical absorption spectra of 1 reveal the presence of a wide optical bandgap of 3.73 eV.