Biomedical subjects

Necmi Dege

Publications and source records attributed to Necmi Dege.

3 recordsLinked to original sources

PubMed2006

Bis(acesulfamato-kappaO4)diaquabis(3-methylpyridine-kappaN)nickel(II).

In the crystal structure of the title compound [systematic name: diaquabis(6-methyl-2,2-dioxo-1,2,3-oxathiazin-4-olato-kappaO4)bis(3-methylpyridine-kappaN)nickel(II)], [Ni(C4H4NO4S)2(C6H7N)2(H2O)2], the Ni(II) centre resides on a centre of symmetry and has a distorted octahedral geometry. The basal plane is formed by two carbonyl O atoms of two monodentate trans-oriented acesulfamate ligands and two trans aqua ligands. The axial positions in the octahedron are occupied by two N atoms of two trans pyridine ligands. Molecules are stacked in columns running along the a axis. There are pi-pi stacking interactions between the molecules in each column, with a distance of 3.623 (2) A between the centroids of the pyridine rings. There are also O-H...O interactions between the columns.

Crystallography, X-Ray↗

PubMed2006

Bis(acesulfamato-kappa2O4,N)bis(3-methylpyridine)copper(II).

In the crystal structure of the title compound {systematic name: bis[6-methyl-1,2,3-oxathiazin-4(3H)-one 2,2-dioxide(1-)-kappa2N3,O4]bis(3-methylpyridine)copper(II)}, [Cu(C4H4NO4S)2(C6H7N)2], the CuII centre resides on a centre of symmetry and has an octahedral geometry that is distorted both by the presence of four-membered chelate rings and because of the Jahn-Teller effect. The equatorial plane is formed by the N atoms of two methylpyridine ligands and by the more basic O atoms of the acesulfamate ligands, while the weakly basic N atoms of these ligands are in elongated axial positions with a misdirected valence. The crystal is stabilized by two intermolecular C-H...O interactions involving the methyl and CH groups, and the sulfonyl O atoms of the acesulfamate group.

Cations, Divalent↗

PubMed2003

Dinicotinamidium squarate.

The crystal structure determination of the dinicotinamidium squarate salt, 2C(6)H(7)N(2)O(+).C(4)O(4)(2-), is reported, with the squarate dianion residing on an inversion centre and the unique cation in a general position. Salt formation occurs by donation of two H atoms from squaric acid to the nicotinamide base. The crystal packing is derived from three types of hydrogen bonding. The primary hydrogen bond involves a squarate anion O atom and an H atom of the protonated pyridine group of the nicotinamide, with an N.O distance of 2.5760 (13) A. The second hydrogen bond involves a second anion O atom and an amide H atom, with an N.O distance of 2.8374 (14) A. Thirdly, an intermolecular interaction between two coplanar nicotinamide moieties occurs between an amide O atom and a symmetry-related amide H atom, with an N1.O3 distance of 2.8911 (15) A. These hydrogen bonds are also responsible for the planarity of the nicotinamide moiety in the salt.

Journal Article↗