A new packing variant of catena-poly[[aquachlorocopper(II)]-mu-pyrazine-2-carboxylato-O,N:N'].
Single crystals of the title coordination polymer, [CuCl(C5H3N2O2)(H2O)], have been prepared by hydrothermal synthesis. The compound is composed of infinite one-dimensional chains of pseudo-square-pyramidal Cu(II) ions connected via pyrazine-2-carboxylate ligands. A network of O-H...O hydrogen bonding between adjacent chains is responsible for a bilayer structure different from the previously reported polymorph.
1D polymeric copper(II) complexes containing bridging tridentate pyrazinato and terminal chloro or azido anions. Synthesis, spectral, structural and thermal study of [CuCl(pyrazinato)(H2O)]n and [Cu(N3)(pyrazinato)(H2O)]n complexes
Abstract The polymeric complexes [CuCl(pyrazinato)(H2O)]n (1) and [Cu(N3)(pyrazinato)(H2O)]n (2) have been synthesized and characterized by spectroscopic methods and X-ray crystallography. The overall spectral results indicate that these complexes contain tridentate pyrazinato ligands, terminal chloride or azide groups and aqua molecules. In the structure of complex (1), each copper atom, which is chelated by O(1) and N(1) atoms of the pyrazinato anions, links Cl(1) atom, O(3) atom from an aqua molecule and the second nitrogen, N(2) from a pyrazinato group of a neighbouring unit giving rise to a 1D polymeric structure. The structure of complex (2), which is very similar to 1 features five coordinate copper(II) atom, N, N,O-tridentate pyrazinato ligand, terminal azido ligand, aqua molecule and 1D polymeric structure. There are different types of hydrogen bonds in both complexes. The thermal decomposition of complexes (1) and (2) was investigated thermogravimetrically in nitrogen atmosphere.
Preparation and structural characterization of catena-μ(1,3)-azido-μ(O,N-picolinato)-aquamanganese(II), Mn(NC5H4CO2)(N3)(H2O)
Abstract A mixed ligand complex of manganese(II) azide with picolinic acid, namely catena-μ(1,3)-azido-μ(O,N-picolinato)aquamanganese(II), was synthesized and characterized by X-ray crystallography. The coordination environment of the manganese(II) atom is a distorted octahedron. Each metal atom, which links a water molecule [MnO(1) = 2.218(3) A], is chelated by a picolinato anion [via its ring nitrogen atom, MnN = 2.278(3) A, and a carboxylato oxygen atom, MnO(2) = 2.167(2) A]. The chelating carboxylate O(2) atom is further bridging another manganese atom giving rise to a centrosymmetric dimeric Mn2O2 [MnO(2a) = 2.243(2) A]. These dimeric units are connected to μ(1,3) bridging azido ligands [MnN = 2.167(3) and 2.219(3) A] to form a two dimensional layer structure along the ab plane. Each water molecule forms two OH···O hydrogen bonds with the non-chelating carboxylate oxygen atoms of two adjacent picolinato groups. The IR and Raman spectra are also reported and correlated with the structure of the complex. The vibrational bands of diagnostic value are compared to the values of the carboxylic acid and the free anion.