annual report annual report annual report annual report 2005

92
RADIOCHEMISTRY, STABLE ISOTOPES,
NUCLEAR ANALYTICAL METHODS, GENERAL CHEMISTRY
ating between the coordinated water molecules
and carboxylate oxygen atoms.
Fig.1. Atom labelling scheme for bis[hexaquamagnesium(II)]
pyrazine-2,3,5,6-tetracarboxylate tetrahydrate.
Non-hydrogen atoms are shown at 50% probability
displacement ellipsoids. Symmetry code: (I)
-x+2, -y, -z.
X-ray diffraction data collection was carried out
on a KUMA KM4 four circle diffractometer at the
Institute of Nuclear Chemistry and Technology.
Structure solution and refinement was performed
using SHELXL programme package.
References
[1]. Part L. Starosta W., Leciejewicz J.: The crystal structure
of a calcium(II) complex with pyrazine-2,3-dicarboxylate,
nitrate and water ligands. J. Coord. Chem.,
58, 891 (2005).
[2]. Part LI. Gryz M., Starosta W., Leciejewicz J.: Doubly
bridged ribbons in the structure of an ionic complex,
hydronium zinc(II) pyrazine-2,3-dicarboxylate. J. Coord.
Chem., 58, 931 (2005).
Fig.2. Packing of molecules in the unit cell of bis[hexaquamagnesium(II)]
pyrazine-2,3,5,6-tetracarboxylate
tetrahydrate. Hydrogen atoms have been omitted.
[3]. Part LII. Starosta W., Leciejewicz J.: Two-dimensional
molecular pattern in the structure of a calcium(II) complex
with pyrazine-2,3-dicarboxylate and water ligands.
J. Coord. Chem., 58, 963 (2005).
[4]. Part LIII. Starosta W., Leciejewicz J.: Catenated molecular
pattern in the crystal structure of a copper(II)
complex with pyrazine-2,6-dicarboxylic acid and chloride
ligands. J. Chem. Crystallogr., 35, 661 (2005).
[5]. Part LIV. Gryz M., Starosta W., Leciejewicz J.: Bis[hexaquamagnesium(II)]
pyrazine-2,3,5,6-tetracarboxylate
tetrahydrate. Acta Crystallogr., E61, m1920 (2005).
CRYSTAL CHEMISTRY OF COORDINATION COMPOUNDS
WITH HETEROCYCLIC CARBOXYLATE LIGANDS.
PART LV. THE CRYSTAL AND MOLECULAR STRUCTURE
OF A MAGNESIUM(II) COMPLEX
WITH PYRIDAZINE-3-CARBOXYLATE AND WATER LIGANDS
Michał Gryz 1/ , Wojciech Starosta, Janusz Leciejewicz
1/
Office for Registration of Medicinal Products, Medical Devices and Biocides, Warszawa, Poland
The crystal structure of bis(aqua-O)di(trans-pyridazine-3-carboxylato-N,O)magnesium(II)
dihy-
Fig.1. The molecule of Mg[(C 5
H 3
N 2
O 2
)(H 2
O)] 2·2H 2
O with
atom labelling scheme. Unlabelled atoms are related
by symmetry code (x-1, y-1, z-1). Displacement ellipsoids
are drawn at the 50% probability level.
Fig.2. Packing of Mg[(C 5 H 3 N 2 O 2 )(H 2 O)] 2 and solvation
water molecules in the crystal structure. Dashed lines
indicate hydrogen bonds.