Yun-Xia Yang

Four cobalt(II) complexes based on a new tricarboxylate with a naphthalene ring and different N-containing ligands: synthesis, crystal structures and magnetic properties

Four novel cobalt(II) complexes {[Co3(L)2(dib)3(H2O)2]·2H2O}n (1), {[Co3(L)2(4,4′-bibp)3(H2O)4]·2H2O}n (2), {[Co(HL)(bidpe)]·H2O}n (3) and {[Co2(L)(bib)0.5(μ3-OH)]·2H2O}n (4) have been prepared by employing Co(II) nitrate, a tricarboxylate ligand (H3L) and different N-containing ligands under hydrothermal conditions, where H3L = 3-((6-carboxynaphthalen-2-yl)oxy)phthalic acid, dib = 1,4-di(1H-imidazol-1-yl)benzene, 4,4′-bibp = 4,4′-di(1H-imidazol-1-yl)-1,1′-biphenyl, bidpe = 1,1′-(oxybis(4,1-phenylene))bis(1H-imidazole), bib = 4,4′-bis((2-methyl-1H-imidazol-1-yl)methyl)-1,1′-biphenyl. Single crystal X-ray analysis reveals that complex 1 exhibits an infinite 2D framework formed by the L3− and dib ligands, complex 2 displays a 3D supramolecular architecture linked by hydrogen bonds, complex 3 features a 1D chain in which lattice water molecules locate with the help of hydrogen bonds, complex 4 is a homochiral 3D network with right-handed 43 and 21 helices. The phase purity, IR spectra and thermal stabilities of 1–4 have been investigated. Additionally, the magnetic behaviors for 1–4 have also been studied, revealing antiferromagnetic interactions between Co(II) ions in them.

Two Zn(II) coordination polymers constructed by a new tricarboxylate and different N-containing ligands: synthesis, crystal structures, and selective luminescence sensing for Fe3+ in aqueous solution

Abstract Two Zn(II) coordination polymers, {[Zn3(L)2(bipy)2(H2O)4}n (1) and {[Zn(HL)(4,4′-bibp)}n (2), were obtained from Zn(II) nitrate, a tricarboxylate ligand (H3L) and different N-containing ligands with hydrothermal conditions, where H3L = 4-((6-carboxynaphthalen-2-yl)oxy)phthalic acid, bipy = 4,4′-bipyridine, and 4,4′-bibp = 4,4′-di(1H-imidazol-1-yl)-1,1′-biphenyl. Single-crystal X-ray analysis reveals that 1 has a 2-D layer framework formed by L3− and bipy and 2 has an infinite 1-D structure with Zn2 units built by 4,4′-bibp ligands. The phase purity, IR spectra, thermal stabilities, and fluorescence properties in the solid state of 1 and 2 were investigated. Moreover, 1 and 2 were chosen as fluorescent probes to sense different metal ions, showing selective response to Fe3+ ion through luminescence quenching. The possible sensing mechanism to Fe3+ ion is also discussed.

A one-dimensional silver(I) coordination polymer based on the 2-[2-(pyridin-4-yl)-1H-benzimidazol-1-ylmethyl]phenol ligand exhibiting photoluminescence

A one-dimensional Ag(I) coordination complex, catena-poly[[silver(I)-μ-{2-[2-(pyridin-4-yl)-1H-benzimidazol-1-ylmethyl]phenol-κ(2)N(2):N(3)}] perchlorate monohydrate], {[Ag(C19H15N3O)]ClO4·H2O}n, was synthesized by the reaction of 2-[2-(pyridin-4-yl)-1H-benzimidazol-1-ylmethyl]phenol (L) with silver perchlorate. In the complex, the L ligands are arranged alternately and link Ag(I) cations through one benzimidazole N atom and the N atom of the pyridine ring, leading to an extended zigzag chain structure. In addition, the one-dimensional chains are extended into a three-dimensional supramolecular architecture via O-H···O hydrogen-bond interactions and π-π stacking interactions. The complex exhibits photoluminescence in acetonitrile solution, with an emission maximum at 390 nm, and investigation of the thermal stability reveals that the network structure is stable up to 650 K.

Syntheses, structures and antioxidant activities of two new Cu(II) complexes with a benzimidazole schiff base ligand

AbstractTwo new copper complexes based on a schiff base ligand (N-(methyl-2- benzimidazolmethylidene)-2-hydroxyaniline (L), [CuL2NO3]NO3·2EtOH (1), and [CuLNO3]2·2EtOH (2) have been synthesized and...

CCDC 1537623: Experimental Crystal Structure Determination

Related Article: Jing Sun, Ke-Xia Shang, Ya-Jun Wu, Qian Zhang, Xiao-Qiang Yao, Yun-Xia Yang, Dong-Cheng Hu, Jia-Cheng Liu||Polyhedron|||doi:10.1016/j.poly.2017.11.037

Crystal structures of four inclusion compounds of 2,2′-dithiosalicylic acid and tetraalkylammonium

ABSTRACT Herein four inclusion compounds of 2,2′-dithiosalicylic acid and tetraalkylammonium, 2(CH3)4N+·C14H8O4S22−·H2O (1), (C2H5)4N+·C14H9O4S2−·0.25H2O(2), (n-C3H7)4N+·C14H9O4S2− (3) and (n-C4H9)4N+·C14H9O4S2−(4) are prepared and characterized by X-ray single crystal diffraction. As shown in the results, compounds 1 and 3 belong to orthorhombic crystal system with different space groups of P212121 and Pca21, and 2 and 4 are monoclinic system with similar groups of P21/n and P21/c. The crystallography data are displayed below: 1: a = 10.5903(7) Å, b = 10.6651(7) Å, c = 21.9476(13) Å, V = 2478.9(3) Å3, Z = 4, R1 = 0.0359; 2: a = 8.13340(1) Å, b = 22.0741(3)Å, c = 13.2143(2)Å, β = 101.6360(1) °, V = 2323.70(6) Å3, Z = 1, R1 = 0.0385; 3: a = 15.7857(2) Å, b = 8.24830(1) Å, c = 20.2599(2) Å, V = 2637.94(5) Å3, Z = 4, R1 = 0.0308degree4: a = 11.7476(2) Å, b = 17.1346(1) Å, c = 16.3583(3)Å, β = 109.4560(1) °, V = 3104.74(9)Å3, Z = 4, R1 = 0.0562. Interestingly, although the carbon chains of the guest templates vary from methyl group to butyl group, the host molecules of 2,2′-dithiosalicylic acid all construct the similar 2D hydrogen-bonded host layers with or without the existence of water molecules to contain the guest templates to yield analogous sandwich-like inclusion compounds. Obviously, although the guest templates will have certain effects on the ultimate formation of these crystal structures, the host molecule of 2,2′-dithiosalicylic acid is a controlling factor to form these four inclusion compounds.