Xiao‐Qing Shen

Crystal structures and luminescence properties of two new terbium complexes with aromatic carboxylic acid

Two new terbium complexes with aromatic carboxylic acids, [(Tb)2(L1)6(H2O)4] (1) and [(Tb)2(L2)6(H2O)2(DMF)2] (2) (HL1: nicotinic acid; HL2: 4-hydroxybenzoic acid), with different coordination geometries have been synthesized and their crystal structures determined. The luminescence properties of the two complexes, including the phosphorescence lifetime, have been investigated. The effect of a secondary ligand on luminescence of the ternary terbium complex with carboxylic acid and the relationship between luminescence properties and crystal structure, including coordination mode of the carboxyl groups from HL1 and HL2 and coordination mode of a secondary ligand, are discussed.

Syntheses and crystal structures of two Zn(II) complexes, [Zn(Fura)2(2,2′-bipy)(H2O)] and [Zn(μ-dnbc)2] (Fura=Furoic acid, 2,2′-bpy=2,2′-bipyridine, dnba=3,5-dinitrobenzoic acid)

Two Zn(II) complexes, [Zn(Fura)2(2,2′-bpy)(H2O)] (1) and [Zn(µ-dnbc)2] (2), have been synthesized and characterized by X-ray diffraction and IR spectra. 1 is a quaternary Zn(II) complex with ZnN2O3 configuration distorted square pyramid geometry; 2 is a Zn(II) coordination polymer with 1D double-helical chains bridged by 3,5-dinitrobenzoic acid.

Studies on Synthesis and Crystal Structures of Heteronuclear Complexes of Tartarate with Na(I), K(I) and Cu(II)

A unique heteronuclear tartaric coordination complex [C12H20Cu2KNaO24] was synthesized by the interaction of potassium‐sodium tartarate with CuCl2. Its X‐ray crystal structure shows that the new coordination complex belongs to a monoclinic system, P2(1) space group. The crystallographic data are: a=7.6429(15)Å, b=20.753(4) Å, c=8.1058(16)Å, α=90°, β=112.06(3)°, γ=90°. In this complex, two Cu(II) ions that are in different coordination environments and 2 tartarate ligands exist in cyclic forms. These cyclic structures are connected by Na(I)–K(I) ion pairs and then form the complicated crystal structure through the hydrogen‐bond network.

Synthesis and crystal structures of Cu(II) and Pb(II) aroylhydrazone complexes and magnetic properties of [Cu2(L)2(Cl)2(HO)6] n (HL=2-pyridylaldehyde isonicotinoylhydrazone)

Two novel aroylhydrazones complexes {[Cu2(L)2(Cl)2](H2O)6} n (1), [Pb(L)(CH3COO)] (2), (HL = 2-pyridylaldehyde isonicotinoylhydrazone), were synthesized and structurally characterized by means of X-ray single-crystal diffraction. In complex 1, HL coordinates to Cu(II) using the normal coordination of aroylhydrazone, and also two pyridyl nitrogens forming a coordination polymer. There are strong intermolecular π–π stacking interactions in 2. Magnetism of complex 1 was studied in the temperature range 5–300 K. The results reveal the occurrence of a weak ferromagnetic coupling with J = 0.29 cm−1.

Syntheses and crystal structures of two Cu(II) complexes based on a fused heterocycle ligand containing 1,3,4-thiadiazole

By refluxing a mixture of CuCl2 and 3-methyl-6-phenyl-[1,2,4]-triazolo[3,4-b][1,3,4]thiadiazole (TRTZ) with addition of acetic acid and KSCN, respectively, the complexes [Cu(TRTZ)2(OAc)2(H2O)] · 1.5H2O (1) and [Cu(TRTZ)2(SCN)2(H2O)2] · 2DMF (2) were obtained. Single-crystal structure of both complexes was determined and their thermal behaviour and IR spectra examined.

A Novel 1‐D Stacking Z‐Type Supramolecular Complex, [Ni(sphs)(iz)] · EtOH (sphs=4‐(N‐Salicylaldehyde Schiff Base) Benzeneformylhydrazone‐N′‐salicylaldehyde, iz=Imidazole), Constructed by Hydrogen Bonds

A new ligand, 4‐(N‐salicylaldehyde Schiff base) benzeneformylhydrazone‐N′‐salicylaldehyde (H3L), and a new quaternary complex 1, [Ni(sphs)(iz)] · EtOH (sphs=H3L, iz=imidazole), has been designed and synthesized. The structural unit of complex 1 consists of the following groups: one Ni(II), one molecular H3L, one imidazole and one ethanol. It belongs to the orthorhombic system and has a Pbca space group. One deprotonated oxygen in enol‐form, one deprotonated oxygen of hydroxyl and one nitrogen of metheleneimine for H3L and one nitrogen atom of imidazole coordinated to central Ni with two oxygen and two nitrogen in anti‐form, respectively, constructed distorted square geometry, an ethanol existed in crystal lattice. There are intramolecular and intermolecular hydrogen bonds in the crystal structure.

Crystal structure and thermal decomposition kinetics of a 2D coordination polymer of cadmium(II)

A 2D cadmium(II) coordination polymer with oxalate and 2,2′-bipyridine, [Cd2(bpy)(ox)2(H2O)2] n · nH2O, was synthesized and the single crystal structure was determined by X-ray crystallography. Thermal properties and the decomposition kinetics of the title complex were studied showing that the decomposition of this complex in N2 is a two-step process, A . Kinetic parameters were obtained.

Syntheses and Crystal Structures of Fe(III) and Mn(III) Complexes with Salen Ligands: [Fe(salen)CL] · CH3CN and [Mn(salen)(SCN)(CH3OH)] · CH3CN

Fe(III) and Mn(III) complexes with salen possessing appended ligands, [Fe(salen)Cl] · CH3CN(1) and [Mn(salen)(SCN)CH3OH]·CH3CN(2) [salen=N, N′‐bis(2‐hydroxylphenyl)‐o‐phenylene‐diamine], have been synthesized, and their crystal structures have been determined by X‐ray diffraction analyses. The complex (1) belong to triclinic system with space group P‐1, its structural unit has Fe(III)N2O2Cl configuration with distorted quadrangle pyramid geometry. The complex (2) belong to monoclinic system with space group P2(1)/c, its structural unit has MnN3O3 configuration with distorted octahedron geometry.

Synthesis, Crystal Structure and Properties of a Novel Cu(II)Complex with α‐Furan Carboxylate, [Cu(fura)2(bpy)(H2O)], (fura=α‐Furan Carboxylate, bpy=2,2′‐bispyridine)

A novel Cu (II) complex with α‐furan carboxylate and 2,2′‐bispyridine, [Cu(fura)2(bpy)(H2O)], was synthesized. Its crystal structure was determined by X‐ray diffraction analysis, and it belongs to the monoclinic system and space group P2(1)/c with CuO3N2 architecture. The crystal structural unit constructs distorted quadrangle pyramid geometry. The fluorescent and thermal properties of the complex were also studied.

Syntheses, Crystal Structures and Thermal Decomposition Kinetics of Ni(II) and Cu(II) Complexes with dpa and dca: [Ni(dpa)2(dca)2] and [Cu(dpa)2(dca)2] (dpa=2, 2′‐Dipyridylamine, dca=Sodium Dicyanamide) Ligands

The syntheses, crystal structures, luminescence properties and thermal decomposition kinetics of Ni(II) and Cu(II) complexes with dpa and dca, [Ni(dpa)2 (dca)2] (I) and [Cu(dpa)2(dca)2] (II) (dpa=2, 2′‐dipyridylamine, dca=sodium dicyanamide) are described. I crystallizes in Monoclinic cells with c2c space groups; the center metal ion NiII lies in a distorted octahedron environment, and the endmost nitrogen atom of dca with a “V” model coordinates to NiII. Though the chemical formula of II is similar to I, II crystallizes in triclinic cells with a Pī space group. The center CuII ion has an octahedral‐coordinated environment.