Dong-Cheng Hu

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.

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