X-Ray Structure Analysis of Diaquobis(2-Pyrazinecarboxylato) Manganese(ii), Cobalt(ii), Nickel(ii), Copper(ii) and Zinc(ii) Complexes

Neptunium(VI) and Plutonium(VI) Pyrazine-2-carboxylates

“…Taking into account the mutual arrangement of the nitrogen atoms of the aromatic ring and the arrangement of the carboxy group at its coordination to uranyl, they noted that, among two donor nitrogen atoms of the pyrazine ring, only the nitrogen atom adjacent to the carboxy group coordinates to uranyl, although theoretically pyrazine can be a bridging ligand and form a polymeric structure. A similar effect is observed in transition metal complexes with pyrazine-2-carboxylic acid [9].…”

“…Taking into account the mutual arrangement of the nitrogen atoms of the aromatic ring and the arrangement of the carboxy group at its coordination to uranyl, they noted that, among two donor nitrogen atoms of the pyrazine ring, only the nitrogen atom adjacent to the carboxy group coordinates to uranyl, although theoretically pyrazine can be a bridging ligand and form a polymeric structure. A similar effect is observed in transition metal complexes with pyrazine-2-carboxylic acid [9].In this work, we studied complexes of Np(VI) and Pu(VI) with pyrazine-2-carboxylic acid to consider the effect of the metal ion on the structure and properties of the related actinide complexes. It should be noted in addition that compounds of hexavalent transuranium elements with N-donor ligands are, on the whole, poorly studied.…”

Supramolecular Architecture from a Sodium Coordination Polymer with a 3D Net Containing 3‐Aminopyrazine‐2‐carboxylic acid (APZC):Synthesis, Characterization and Crystal Structure of [Na2(APZC)2(μ‐H2O)2(μ3‐H2O)]n

“…It is noteworthy that coordination characteristic for each particular ion is reached by a number of water molecules. 6,7 The six coordination sites of the other set of central metal ions [(Na (1) and Na(3)) were occupied by one hetero-ring nitrogen atom, two oxygen atoms belonging to the nearest bi-dentate carboxylic groups of two pyrazine molecules encapsulated in a cubic formed by eight sodium ions. The coordination of these metal centers was completed by two μ-and one μ 3 -bridging water molecules.…”

“…There are only a few reports on the structurally characterized coordination compounds with this ligand. [4][5][6][7] A hypothesized advantage of this unusual ligand is that coordination through one N atom and the carboxylic O atom would allow the other N atom free to enhance targeted functionalities.…”

Crystal structure of tetra(5-methyl-2-pyrazinecarboxylato)-(4,4′-bipyridine)dizinc(II) dihydrate, Zn2(C6H5N2O2)4(C10H8N2) · 2H2O

“…The related bond lengths of molecular building block in coordination polymer are closed to the value of mononuclear complex [8]. But, under hydrothermal conditions, the Zn(2mpac) 2 unit transforms from trans to cis configuration, in other words, the coordiantion mode of 2mpac ligand varied from chelating to chelating-bridging, the O1 atom of the carboxylate from one 2mpac ligand adopted syn-anti bridging mode to link Zn(2mpac) 2 units and construct achain.…”