Crystal and molecular structures of nickel(II) complexes with pyrazine-2,3-dicarboxylic and 3-aminopyrazine-2-carboxylic acids

• Autorzy: Ptasiewicz-Bąk H. , Leciejewicz J.
• Języki publikacji: EN

Abstrakty

EN

Crystals of diaquobis(trans hydrogen pyrazine-2,3-dicarboxylato N,O)niclel(II) - title compound I, contain monometric molecules. The nickel(II) ion is coordinated by two molecules of pyrazine-2,3-dicarboxylic acid, each donating its heteroring nitrogen [Ni-O 2.0485(15) A] and one oxygen atom, belonging to the nearest monodentate carboxylic group [Ni-O 2.0199(14) A]. Two water molecules [Ni-O 2.0914(17) A] complete the octahedral coordination around the central ion. The second carboxylic group and the heteroring nitrogen do not directly bond to the nickel(II) ion. Monometric molecules of the composition Ni(II)(APZA)2(H2))2-title compound II, have been also found in the crystals of diaquobis(trans 3-amino-2-pyrazinecarboxylato O,N)nickel(II) compound. The coordination of the Ni ion is octahedral. (N,O) bonding moieties of two ligand molecules [Ni-O 2.0395(12) A, Ni-N 2.0669(14) A] and the Ni ion are coplanar. The oxygen atoms donated by two water molecules [Ni-O 2.0656(14) A] constitue the vertices of the slightly elongated octahedron. The structures of both title compounds indicate a preference of nickel ion to form monometric molecules. The monometric molecules contain intramolecular hydrogen bonds. The stability of the crystals is maintained by a system of intermolecular hydrogen bonds.

Słowa kluczowe

EN

pyrazine-2,3-dicarboxylic acid; 3-aminopyrazine-2-carboxylic acid; nickel complexes; X-ray diffraction

• Wydawca: Polskie Towarzystwo Chemiczne
• Czasopismo: Polish Journal of Chemistry
• Rocznik: 1999
• Tom: vol. 73 nr 4
• Strony: 717--725

Twórcy

autor

Ptasiewicz-Bąk H.

autor

Leciejewicz J.

• Instytut Chemii Jądrowej ul. Dorodna 16 03-195 Warszawa