Biomedical subjects

C Näther

Publications and source records attributed to C Näther.

8 recordsLinked to original sources

PubMed2001

catena-poly[[(acetonitrile-N)dichlorocopper(II)]-mu-2,5-dimethylpyrazine-kappa2N:N'].

In the structure of the title compound, [CuCl2(C2H3N)(C6H8N2)], each Cu2+ cation is surrounded by two 2,5-dimethylpyrazine ligands, one acetonitrile ligand and two Cl- anions within a distorted tetragonal pyramid. The acetonitrile ligand, which forms the apex of the pyramid, the Cu2+ cation and the Cl- anions are all located in general positions, whereas each of the 2,5-dimethylpyrazine ligands is located about a centre of inversion. The 2,5-dimethylpyrazine ligands connect the Cu2+ cations via mu-N:N' coordination to form chains.

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PubMed2001

Poly[[aquacopper(I)-mu-bromo]-mu-(5-methylpyrazine-2-carboxylato)-kappa3N4:O,N1-[di-aquacopper(II)]-mu-(5-methylpyrazine-2-carboxylato)-kappa3O,N1:N4-[aquacopper(I)-mu-bromo]].

In the structure of the title compound, [Cu3Br2(C6H5N2O2)2(H2O)4], both copper(I) and copper(II) cations are present. The copper(II) cations are located on centres of inversion and are coordinated by two N atoms and two carboxylate O atoms from two symmetry-related 5-methylpyrazine-2-carboxylate anions, with two water molecules completing a distorted octahedron. The copper(I) cations are coordinated by the second N atom of the 5-methylpyrazine-2-carboxylate anion, one water molecule and two bromide anions within a distorted tetrahedron. Each of the bromide anions connects two symmetry-equivalent copper(I) cations to form zigzag-like CuBr chains. These chains are connected by the [diaquabis(5-methylpyrazine-2-carboxylato)]copper(II) complexes, forming corrugated sheets parallel to (100). The CuBr chains and the sheets are connected via O-H...O and O-H...Br hydrogen bonding.

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PubMed2001

A new type of calixarene: octahydroxypyridin.

A new type of calixarene has been synthesised. Like resorcinol and a number of resorcinol derivatives, 2,6-dihydroxypyridine has been proven to form cyclic tetramers in moderate yields with a number of aliphatic and two aromatic aldehydes in acidic media. The problem of the formation of configurational isomers can be reduced by increasing the reaction temperature and time. With electron-rich aromatic aldehydes, 2,6-dihydroxypyridine unexpectedly yields deep-coloured acyclic quinoid systems. The octahydroxypyridine[4]arenes may have a high potential as receptors for molecular recognition and self organisation.

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PubMed2001

Tris(bis[N-(2-aminoethyl)-1,2-ethanediamine-kappa3N]-nickell(II)) bis(tetrathioantimonate).

Yellow crystals of [Ni(deta)2]3[SbS4]2 (deta is diethylenetriamine, C4H13N3) were synthesized under solvothermal conditions by reacting elemental Ni, Sb and S in a solution of diethylenetriamine. The structure is composed of tetrahedral [SbS4]3- anions in general positions and octahedral [Ni(deta)2]2+ cations located at centres of inversion. In the crystal structure, the anions and cations are stacked in the direction of the a axis in a pseudo-hexagonal arrangement.

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PubMed2001

4,4'-Bipyridine dihydrate at 130 K.

The 4,4'-bipyridine molecules in the title compound, C10H8N2.2H2O, are stacked in the direction of the crystallographic b axis. These stacks are connected via O-H...N and O-H...O hydrogen bonds to form sheets which lie parallel to (100). Chains of O-H...O hydrogen-bonded water molecules are located between the bipyridine stacks. Altogether, four crystallographically independent water molecules and two crystallographically independent bipyridine molecules are involved.

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PubMed2001

Poly[copper(II)-mu-pyrazine-mu(3)-squarato].

In the structure of the title compound, [Cu(C(4)O(4))(C(4)H(4)N(2))](n), each copper cation is surrounded by three squarate (3,4-dihydroxy-3-cyclobutene-1,2-dioate) anions and two pyrazine ligands, all of which are located in special positions. The copper cation and all atoms of the squarate anion are located on a mirror plane, whereas the pyrazine ligand is located around a mirror plane which is perpendicular to the ring plane. The cations are connected via the squarate anions and the pyrazine ligands, forming sheets parallel to (001).

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PubMed2001

RbCu2VS4.

The reaction of Cu and V in a Rb(2)S(5) melt yields black crystals of rubidium dicopper vanadium tetrasulfide, RbCu(2)VS(4). The structure is comprised of [Cu(2)VS(4)](-) layers within the (010) plane which are separated by Rb(+) cations. The layers consist of a network of edge- and corner-sharing [VS(4)] and [CuS(4)] tetrahedra parallel to (010). The optical band gap was determined as 1.45 eV.

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PubMed2001

Poly[copper(I)-mu-bromo-mu-2,3-dimethylpyrazine-N:N'].

In the structure of the title compound, [CuBr(C(6)H(8)N(2))](n), each Cu(2+) cation is surrounded by two 2,3-dimethylpyrazine ligands and two Br(-) anions in a distorted tetrahedral arrangement. The Cu(2+) cations and Br(-) anions form (Cu(2)Br(2))(2) rhomboid dimers located around a centre of inversion. The 2,3-dimethylpyrazine ligands connect the Cu(2+) cations in the dimers into sheets parallel to (010).

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