Phenylalanine-Based Co and Cd 1D Coordination Polymers: Structural Properties and Catalytic Application for Solvent-Free Aerobic Oxidation of Cycloalkene.

Two 1D coordination polymers (CPs) with general formula [M()(HO)(AcO)], (M = Co () or Cd (), AcO = acetate anion and denotes l-phenylalanine based ligand), were synthesized and fully characterized by various spectroscopies (UV-vis, FTIR, and NMR), thermal techniques, magnetic measurements (for ), and single-crystal and powder X-ray diffraction studies. They can be described as "ribbon-like" 1D polymers constructed through a zigzag arrangement. The polymeric structure is developed due to the coordination mode adopted by the amino acid ligand, classified as μNO:O:O, which simultaneously links three metal centers.

Guanine crystal formation by bacteria.

Background: Guanine crystals are organic biogenic crystals found in many organisms. Due to their exceptionally high refractive index, they contribute to structural color and are responsible for the reflective effect in the skin and visual organs in animals such as fish, reptiles, and spiders. Occurrence of these crystals in animals has been known for many years, and they have also been observed in eukaryotic microorganisms, but not in prokaryotes.

Synthesis, structural and electrochemical properties of a new family of amino-acid-based coordination complexes.

Metalloproteins involved in oxidation-reduction processes in metabolism are fundamental for the wellbeing of every organism. The use of amino-acid-based compounds as ligands for the construction of biomimetic coordination systems represents a promising alternative for the development of new catalysts. Herein is presented a new family of copper, zinc and nickel coordination compounds, which show four-, five- and six- coordination geometries, synthesized using Schiff base ligands obtained from the amino acids L-alanine and L-phenylalanine.

Nickel(II) complexes based on L-amino-acid-derived ligands: synthesis, characterization and study of the role of the supramolecular structure in carbon dioxide capture.

The formation of the symmetrical μ-carbonate-bridged self-assembled trinuclear Ni complex Na{[Ni(LO)(HO)](μ-CO)} (LO is the carboxylate anion of a L-tyrosine derivative), involves atmospheric CO uptake. The asymmetric unit of the complex comprises an octahedral coordination for the Ni with two L-tyrosine-based ligands, a water molecule and one O atom of the carbonate bridge. The Ni-μ-CO core in this compound is the first reported of this kind according to the Cambridge Structural Database (CSD).

Synthesis, crystal structure and study of the crystal packing in the complex bis(4-aminopyridine-κN)dichloridocobalt(II).

Despite the large number of reported crystalline structures of coordination complexes bearing pyridines as ligands, the relevance of π-π interactions among these hereroaromatic systems in the stabilization of their supramolecular structures and properties is not very well documented in the recent literature. The title compound, [CoCl(CHN)], was obtained as bright-blue crystals suitable for single-crystal X-ray diffraction analysis from the reaction of 4-aminopyridine with cobalt(II) chloride in ethanol. The new complex was fully characterized by a variety of spectroscopic techniques and single-crystal X-ray diffraction.