Synthesis, structural characterization and thermal properties of a new copper(II) one-dimensional coordination polymer based on bridgingN,N′-bis(2-hydroxybenzylidene)-2,2-dimethylpropane-1,3-diamine and dicyanamide ligands

Abstract

The design and synthesis of polymeric coordination compounds of 3d transition metals are of great interest in the search for functional materials. The coordination chemistry of the copper(II) ion is of interest currently due to potential applications in the areas of molecular biology and magnetochemistry. A novel coordination polymer of Cu(II) with bridging N,N'-bis(2-hydroxyphenyl)-2,2-dimethylpropane-1,3-diamine (H2L-DM) and dicyanamide (dca) ligands, catena-poly[[[μ2-2,2-dimethyl-N,N'-bis(2-oxidobenzylidene)propane-1,3-diamine-1:2κ(6)O,N,N',O':O,O']dicopper(II)]-di-μ-dicyanamido-1:2'κ(2)N(1):N(5);2:1'κ(2)N(1):N(5)], [Cu2(C19H20N2O2)(C2N3)2]n, has been synthesized and characterized by CHN elemental analysis, IR spectroscopy, thermal analysis and X-ray single-crystal diffraction analysis. Structural studies show that the Cu(II) centres in the dimeric asymmetric unit adopt distorted square-pyramidal geometries, as confirmed by the Addison parameter (τ) values. The chelating characteristics of the L-DM(2-) ligand results in the formation of a Cu(II) dimer with a double phenolate bridge in the asymmetric unit. In the crystal, the dimeric units are further linked to adjacent dimeric units through μ1,5-dca bridges to produce one-dimensional polymeric chains.

Crystal structure and photoluminescence properties of a new CdIIcoordination polymercatena-poly[bis[4-bromo-2-({[2-(pyrrolidin-1-yl)ethyl]imino}methyl)phenolato-κ3N,N′,O]di-μ3-chlorido-di-μ2-chlorido-bis(methanol-κO)tricadmium(II)]

“…Moreover, polynuclear d 10 metal complexes, such as Cd II coordination polymers, have attracted interest due to their high thermal stability and good photoluminescence and electroluminescence properties (Ford et al, 1999;Manjunatha et al, 2011). Although there are numerous factors, such as the nature of the metal ion, the structural characteristics of the ligand, the presence of solvents and counter-ions and the metal-ligand ratio, which play important roles in the construction of these CPs, the most effective way is to choose suitable N-and Odonor multidentate organic ligands (Yin et al, 2016;Zhao et al, 2015;Hopa & Cokay, 2016). Schiff base-metal complexes have been used widely as catalysts for many organic reactions, such as ring-opening polymerization and oxidation (Keypour et al, 2015;Chen et al, 2006;Hung et al, 2008;Gupta & Sutar, 2008).…”

Photoluminescence properties of Gd(III) and Ce(III) lanthanide based metal organic frameworks

“…In addition, hydrothermal synthesis technique is the most common and accomplished method to synthesis the lanthanide based porous materials [18,19]. Although there have been numerous factors such as the structural characteristics of the ligands and metal ions, the presence of solvents, the metal-ligand ratio, the pH value and reaction temperature which play important roles to constructing the coordination polymers, the most effective way is to choose suitable organic ligands [20,21]. The preparation of these LnMOFs can be controlled by the combination of the functionalities of the appropriate organic ligands containing N-or O-donor atoms and the geometrical preferences of the lanthanide ions [22].…”

Two coordination polymers containing the dicyanamide ligand: Synthesis, crystal structures, and HFEPR studies

“…These different coordination modes allow for the preparation of compounds with various molecular architectures including mono-and polynuclear systems, as well as one-, two-and three-dimensional networks. [5,11,12] Herein, we report the syntheses and crystal structures of two coordination polymers, [Ni(dca) 2 (dmdpy)] n (1), and [Zn(dca) 2 (dmdpy)] n (2). Compound 1 is isostructural to the [Co(dca) 2 (dmdpy)] n described by us previously.…”

“…[2][3][4] The design, synthesis, and structural characterization of coordination polymers have been intensely investigated over the past two decades. [4,5] Common spacers used for the connection of transition metals to polymeric structures include cyanides, azides, cyanates, thiocyanates, selenocyanates, dicyanamides, tricyanomethanides, N-heterocyclic auxiliary 2 ligands together with related anionic ligands such as tetracyanoethanide or tetracyanoquinodimethanide and many others. [6,7] It was proved that pseudohalides could behave as bridging ligands connecting transition metals to give complexes with various topological structures, including isolated molecular clusters, 1D chains, and 2D or 3D networks.…”