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.
Google Earth: Mathematical Art Forms
We trace the development of Google Earth and consider various artifacts, natural and anthropogenic, ancient and modern. These artifacts are only obvious from high elevations and some have a mathematical form and artistic appeal. We also illustrate how Google Earth's high-altitude imagery can be fruitful inspiration for mathart and provide some example.