Yu-Li Dang

One Cadmium(II) Complex of a New Polydentate Double Schiff Base Ligand Derived from 1,10-phenanthroline: Syntheses, Structures, and Fluorescent Property

One Cd(II) complex of a new polydentate double Schiff base ligand 1,10-phenanthroline-2,9-dicarboxaldehyde-di-picolinohydrazone (L), [Cd(L)(SCN)2], was synthesized and structurally characterized. This compound belongs to a monoclinic system with space group C2/c. In this monomer, the cadmium metal center is coordinated to four nitrogen atoms and two oxygen atoms from one organic ligand L acting as a hexadentate chelate, and two nitrogen atoms from two distinct SCN− anions, forming an uncommon distorted hexagonal bipyramid coordination geometry. Furthermore, fluorescent and thermal properties of the complex were performed on the powder sample. The complex strongly emits at 467 nm with the excitation of 410 nm and is thermally stable up to 300°C, and thus can be utilized as one potential fluorescent material.

catena-Poly[[[N′-(4-cyano­benzyl­idene)nicotinohydrazide)silver(I)]-μ-N′-(4-cyano­benzyl­idene)nicotinohydrazide] hexa­fluorido­phosphate]

In the title polymer, {[Ag(C14H10N4O)2]PF6}n, each AgI ion is coordinated by two N atoms from two pyridyl rings of independent N′-(4-cyanobenzylidene)nicotinohydrazide ligands, and one N atom from one carbonitrile group of a symmetry-related ligand in a distorted T-shaped geometry. The ligands exhibit two modes of coordination. One acts as a bridge connecting Ag atoms to form one-dimensional chains along [01]. The other acts as a terminal monodentate ligand, coordinating to Ag through its pyridyl N atom. Two neighbouring antiparallel chains in the crystal are connected through N—H⋯O hydrogen bonds. Other adjacent chains are packed via Ag⋯O interactions, with Ag⋯O separations of 2.876 (2) Å. In addition, PF6 − counter-anions interact with the hydrazone groups through N—H⋯F hydrogen bonds. The PF6 − anion is disordered over two sites, with occupancies of 0.773 (8) and 0.227 (8).

One Monomer and One Dimer Cd(II) Complexes of 2,9-diethoxy-1,10-Phenanthroline by Two Different Crystallizing Methods: Syntheses, Structures, and Fluorescent Property

Two different crystallizing methods produced different structural complexes 1 and 2 using the same metal salt and the same bidentate organic ligand, 2,9-diethoxy-1,10-phenanthroline (L), in the same solvent. They are one monomer [Cd(L)2(H2O)] [CdCl4]·CH3OH (1) and one dimmer [Cd2(L)2Cl4] (2). Complex 1 is a CdII complex containing one cationic part [Cd(L)2(H2O)]2+ and one anionic part [CdCl4]2−. Complex 2 is a CdII dimer bridged by chloride atoms. Furthermore, fluorescent properties of these two coordination compounds have been measured.

Bis[N'-(3-cyano-benzyl-idene)isonicotino-hydrazide]silver(I) trifluoro-acetate.

In the title compound, [Ag(C14H10N4O)2]CF3CO2, the AgI ion is coordinated by two N atoms of the pyridine rings of two N′-(3-cyanobenzylidene)isonicotinohydrazide ligands in a nearly linear geometry. In the crystal structure, a combination of close contacts formed via Ag⋯N interactions [Ag⋯N = 3.098 (2) and 3.261 (2) Å] from symmetry-related molecules and intermolecular N—H⋯O hydrogen bonds between CF3CO2 − anions and the hydrazone groups of two ligands give rise to chains. Furthermore, there are Ag⋯O interactions with a separation of 2.765 (2) Å between chains. The F atoms of the CF3CO2 − anion are disordered over two sites with refined occupancies of 0.593 (5) and 0.407 (5).

One Supramolecular 3D Framework based on 1D Coordination Polymer of Cobalt(II) with 1,3-Bis(4-pyridyl)propane (bpp) Pillared by bpp Ligands: Synthesis, Crystal Structure and Magnetic Properties

One Co(II) 1D chain coordination polymer {[Co(bpp)2(H2O)2] (bpp)3· (H2O)· (ClO4)2}n (bpp = 1,3-Bis(4-pyridyl)propane) has been synthesized and structurally characterized by single-crystal X-ray analysis. This compound belongs to orthorhombic system with space group Pccn. 1D chains are packed through π −π interactions and linked together by bpp ligands through hydrogen bonds to construct 2D layers. Organic ligand molecules are pillared among these parallel 2D layers to construct a 3D supramolecular inorganic-organic hybrid framework. Organic ligand bpp in this compound exhibits three unusual comformations. Studies on magnetic properties of this compound show that it presents weakly antiferromagnetic behavior.

Dichlorido(2,9-diprop­oxy-1,10-phenanthroline-κ2N,N′)cadmium(II)

In the title complex, [CdCl2(C18H20N2O2)], the CdII ion is coordinated by two N atoms from a bis-chelating 2,9-dipropoxy-1,10-phenanthroline ligand and two Cl atoms in a distorted tetrahedral environment. The two Cd—Cl bond distances are significantly different from each other and the N—Cd—N bond angle is acute. In the crystal structure, there are π–π stacking interactions between symmetry-related phenanthroline ring systems, with a centroid–centroid distance of 3.585 (3) Å.

Dichlorido(2,9-dieth­oxy-1,10-phenanthroline-κ2N,N′)zinc(II)

All non-H atoms except for the Cl atoms lie on a mirror plane in the title complex, [ZnCl2(C16H16N2O2)]. The ZnII ion is coordinated by two N atoms from a bis-chelating 2,9-diethoxy-1,10-phenanthroline ligand and two symmetry-related Cl atoms in a distorted tetrahedral environment. The two Zn—N bond lengths are significantly different from each other and the N—Zn—N angle is acute. In the crystal structure, there are weak but significant π–π stacking interactions between phenanthroline rings, with a centroid–centroid distance of 3.764 (1) Å.

catena-Poly[[[diaqua­bis(2-methyl-6-oxo-1,6-dihydro-3,4′-bipyridine-5-carbo­nitrile)copper(II)]-μ-sulfato] tetra­hydrate]

In the title polymer, {[Cu(SO4)(C12H9N3O)2(H2O)2]·4H2O}n, both the metal center and the sulfate anion are located on a twofold axis. The CuII ion is coordinated by two pyridyl N atoms from two symmetry-related organic ligands, two O atoms from two symmetry-related water molecules, and two O atoms from two symmetry-related sulfate anions, resulting in a distorted octahedral geometry. The sulfate anions act as μ2-bridges and connect metal ions, forming a one-dimensional chain along the b axis. The three-dimensional crystal structure is established through intermolecular N—H⋯O and O—H⋯O hydrogen bonds involving the organic ligands, sulfate anions, coordinated and uncoordinated water molecules, and through π–π interacting 2-pyridone rings, with centroid–centroid separations of ca 3.96 Å and tilt angles of ca 2.62°.