Diaqua­bis(1,3-propane­diamine)nickel(II) squarate tetrahydrate

The asymmetric unit of the title compound, [Ni(C3H10N2)2(H2O)2](C4O4)·4H2O, contains one-half of the diaqua­bis(1,3-propane­diamine)nickel(II) cation, one-half of the centrosymmetric squarate anion and two uncoordinated water mol­ecules. In the cation, the NiII atom is located on a crystallographic inversion centre and has a slightly distorted octa­hedral coordination geometry. The six-membered chelate ring adopts a chair conformation. O—H⋯O hydrogen bonds link the cation and anion through the water mol­ecule, while N—H⋯O hydrogen bonds link the cation and anion and cation and water mol­ecules. In the crystal structure, inter­molecular O—H⋯O and N—H⋯O hydrogen bonds link the mol­ecules into a three-dimensional network structure

Novel Coordination Compounds Based on 2-Methylimidazole and 2,2’-dimethylglutarate Containing Ligands: Synthesis and Characterization

Two novel copper and cadmium complexes with 2-methylimidazole (2-meim) and 2,2¢-dimethylglutarate (dmg2-) as ligands, [Cu2(m-dmg)2(2-meim)4]∙5H2O (1) and {[Cd(m-dmg)(2-meim)2]∙H2O}n (2), have been systematically synthesized and characterized. The result in organic-inorganic crystalline solid. Their solid-state structures have been solved with elemental analysis, IR spectroscopy, and the single-crystal X-ray diffraction. The Cu(II) ions distorted square planar geometry (CuO2N2) while Cd(II) ions showed a distorted octahedral geometry (CdO4N2). Complex 1 is dimeric structure, in which Cu(II) ions were bridged by dmg ligand. These dimeric units are extended to the 3D supramolecular structure with hydrogen bonding, C–H∙∙∙p, C–O∙∙∙p and p∙∙∙p interactions. The complex 2 is 1D polymeric structure, where Cd(II) ions are connected by bis(bidentate) dmg ligands to form 1D zig-zag polymeric chains which are further extended in 3D supramolecular structure through hydrogen bonding, C–H∙∙∙p and C–O∙∙∙p interactions. The thermal properties of the complexes were investigated

Synthesis and characterization of new Ag(I) coordination networks based on saccharinate and bis(isopropylimidazole) ligands exhibiting very close C-H...Ag interactions

Two Ag(l) coordination networks, formulated as [Ag(sac)(mu-bisopib)](n) (1) and [Ag(sac)(mu-pbisopix)].H2O (2), have been synthesized based on the bis(isopropylimidazole) ligands 1,4-bis(2-isopropyl-1H-imidazol-1-yl)butane (bisopib) and 1,4-bis((2-isopropyl-1H-imidazol-1-yl)methyl)benzene (pbisopix), respectively, along with saccharinate (sac) ligands. All the complexes were characterized by elemental analysis, IR spectroscopy and single-crystal X-ray diffraction studies. The X-ray crystallographic studies of 1 and 2 revealed that the Ag(I) ions are mu-bridged by the bis(isopropylimidazole) derivative ligands to generate 1D zig-zag polymer and dinuclear structures, respectively. As far as we know, complex I shows the closest C-H...Ag interaction distance among similar literature examples. In complex 1 adjacent 1D coordination polymers are further joined by C-H...O hydrogen bonds and pi...pi interactions, generating a 3D supramolecular network. The C-H...O hydrogen bonds and C-H...pi interactions play a crucial role in the architecture of the 3D network of complex 2. Thermal decompositions and photoluminescent properties of the Ag(I) complexes are also discussed herein. (C) 2016 Elsevier Ltd. All rights reserved.WOS:0003940633000362-s2.0-8500818779

Three dimensional manganese(II) coordination polymers constructed from 2,2-dimethylglutarate and bis(pyridyl) type ligands

Hydrothermal reactions of Mn(CH3COO)(2)center dot 4H(2)O and 2,2-dimethylglutaric acid (H(2)dmg) in the presence of pyridyl group ligands (4,4'-bipyridine (bipy) or 1,2-di(4-pyridyl)ethylene (dpeten)) are produced under the same conditional. Two new three dimensional coordination polymers, namely, [Mn-2(mu(4)-dmg)-(mu(4)-dmg)(mu-bipy)](n), (1), and [Mn-2(mu(4)-dmg)(mu(4)-dmg)(mu-dpeten)](n) (2), were characterized by IR spectroscopy, elemental analysis, single crystal and powder X-ray diffractions as well as thermal analysis techniques. The X-ray single crystal data exhibits that 1 displays 3D framework without interpenetrating, whereas 2 shows a 2-fold 3D -> 3D interpenetrating structure. The dmg anions coordinate to Mn(II) ions as a chelate and bis-bridging ligand to form 1D chain. The adjacent 1D chains are connected by bipy or dpeten ligands to generate 3D frameworks. Additionally, the dmg ligand exhibits two unprecedented coordination modes. (C) 2019 Elsevier Ltd. All rights reserved