Structures and properties of mercury(II) coordination polymers

Sonochemical syntheses of a new fibrous-like nano-scale manganese(II) coordination supramolecular compound; precursor for the fabrication of octahedral-like Mn3O4 nano-structure

Nanoparticles of a new three-dimensional Mn(II) coordination supramolecular compound, [Mn(L)2(H2O)2] (1), (L(-)=1H-1,2,4-triazole-3-carboxylate), have been synthesized by a sonochemical process and characterized by scanning electron microscopy (SEM), X-ray powder diffraction (XRPD), FT-IR spectroscopy and elemental analyses. Structural determination of compound 1 reveals the Mn(II) ion is six coordinated, bonded to two nitrogen atoms, two oxygen atoms from the L(-) ligand and two water molecules. The thermal stability of compound 1 both its bulk and nano-size has been studied by thermal gravimetric (TG) and differential thermal analyses (DTA) and compared each other. Concentration of initial reagents effects on size and morphology of nano-structured compound 1, have been studied and shows that low concentrations of initial reagents decreased particles size and also leaded to fibrous-like nanostructures morphology. Mn3O4 nano-structure with an octahedral-like morphology were simply synthesized by solid-state transformation of compound 1 at 650 °C.

A new lead(ii) nanoporous three-dimensional coordination polymer: pore size effect on iodine adsorption affinity

A three-dimensional (3D) nanoporous coordination polymer, [Pb(4-bpdb)(μ-NO₃)(μ-SCN)]_n·1.5CH₃OH (TMU-15), was synthesized. In this compound, we successfully loaded the porous crystals with I₂ by suspending them in a solution of I₂ in cyclohexane.

Effect of N-donor ancillary ligands on structural and magnetic properties of oxalate copper(ii) complexes

Through varying the auxiliary N-donor ligands nine new compounds have been synthesized and characterised structurally and spectroscopically. The magnetic properties of the complexes have been investigated and discussed in the context of their structures.

Effect of robust π–π stacking synthon on the formation of mercury coordination compounds; an unusual pseudo-square planar geometry

In this study, three Hg(ii) complexes, [HgCl₂(L2-naph)]_n, 1, [HgBr₂(L2-naph)]_n, 2 and [HgI₂(L2-naph)₂], 3 where L2-naph is N-(naphthalene-2-yl)pyrazine-2-carboxamide ligand have been synthesized and characterized.

Preparation of coordination polymers with 8-hydroxyquinoline azo benzensulfonic acid as a planar multidentate ligand and the study of their photochemical and photo-stability properties

The combination of ditopic ligand 4-(8-hydroxyquinoline-5-azo)-benzensulfonic acid (H2QBS) with metal ions (M = Na(+), Pb(2+), Zn(2+), Mn(2+), Cd(2+)) leads to five different coordination polymers (CPs): [Na2(QBS)(H2O)2]n (1 , 3D framework), {[Pb(QBS)(DMSO)]·2((i)PrOH)}n (2·2(i)PrOH, 2D layer), {[Zn(QBS)(DMSO)]·2DMSO}n (3·2DMSO, 1D chain), [Mn(QBS)((i)PrOH)(DMSO)]n (4, 1D ladder), and [Cd2(QBS)2(DMSO)2(H2O)4]n (5, 1D chain). All compounds were characterized by FT-IR, elemental analysis and TG analysis, and their structures were determined by single crystal X-ray diffraction. As expected, H2QBS acted as a multimode ligand and the azo bond in the trans-form existed in all compounds. Their photo-stability was also studied using irradiation from different light sources (450 nm, 365 nm and 254 nm). Under blue light (450 nm) and lower energy UV light (365 nm), the colors of all compounds were well preserved and the absorption spectra show slight changes. However, when irradiated using higher energy UV light (254 nm), the coordination interaction between the metal ions and the ligand was disassociated and the color faded.

Structural Characterization and Infrared and Electrical Properties of the New Inorganic-Organic Hybrid Compound

New inorganic-organic hybrid [(C3H7)4N]2Hg2Cl6compound was obtained and characterised by single-crystal X-ray diffraction, infrared, and impedance spectroscopy. The latter crystallizes in the monoclinic system (space group C 2/c, ) with the following unit cell dimensions: (1) Å, (6) Å, (2) Å, and (2). Besides, its structure was solved using 84860 independent reflections leading to . Electrical properties of the material were studied using impedance spectroscopic technique at different temperatures in the frequency range of 209 Hz to 5 MHz. Detailed analysis of the impedance spectrum suggested that the electrical properties of the material are strongly temperature-dependent. The Nyquist plots clearly showed the presence of bulk and grain boundary effect in the compound.