beaver-devel
[Top][All Lists]
Advanced

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

[Beaver-devel] stratify


From: Frederik Boyer
Subject: [Beaver-devel] stratify
Date: Sat, 30 Sep 2006 16:14:56 +0200
User-agent: Thunderbird 1.5.0.7 (Windows/20060909)


O hydrogen-bonding interactions between water molecules, carboxyl hydroxy groups and carboxylate groups.
Each conformer resides on a centre of inversion.
O interactions stabilize the crystal structure. The anions do not coordinate to the nickel, but act as counter-ions. The Co atom and the mid-point of the bipyridine group are located on inversion centres.
The transition metal cation is six-coordinated by three ethylenediamine molecules in an octahedral geometry.
The ribbons are held together by a network of hydrogen bonds. In the crystal structure, two of the molecules form a hydrogen-bonded dimer, while the third forms a centrosymmetric hydrogen-bonded dimer with its symmetry-equivalent molecule.
O hydrogen bonds, forming chains along the c axis.
This is the first crystal structure of a metal complex of sulfamerazine. The geometry of the complex is comparable to that in a previously reported nitrate salt.
The deviation from a planar arrangement can be attributed to non-classical hydrogen bonds and steric factors. The Cu atom shows a square-pyramidal coordination geometry.
The ZnII atom, located on an inversion centre, is coordinated by two N atoms and two O atoms from two Schiff base ligands in a square-planar geometry.
The ribbons are held together by a network of hydrogen bonds. O hydrogen bonds link the molecules into dimers, which may be effective in the stabilization of the crystal structure. N hydrogen-bonding interactions results in the formation of a dimer.
The anions do not coordinate to the nickel, but act as counter-ions.
In the crystal structure, two of the molecules form a hydrogen-bonded dimer, while the third forms a centrosymmetric hydrogen-bonded dimer with its symmetry-equivalent molecule. O hydrogen bonds help to stabilize the structure. O hydrogen bonding involving the water molecules located on a twofold axis links the complex molecules into a three-dimensional network. The cation and all atoms of the anion lie on a mirror plane.
This leads to the formation of alternate hydrophilic and hydrophobic layers.
Hydrogen bonding between solvent water molecules and complex cations stabilizes the crystal structure.

reply via email to

[Prev in Thread] Current Thread [Next in Thread]