Abstract
The structure of catena-{bis(aqua-μ-O)[di(aqua-O)bis(pyrazine-2,6-dicarboxylato-O,N-μ-O′)dicalcium(II)]}-di(pyrazine-2,6-dicarboxylic acid) hexahydrate consists of dimeric units composed of two calcium(II) ions, two ligand molecules and six water molecules. The calcium ions are bridged by two bidentate oxygen atoms, each donated by one carboxylate group of the ligand. The Ca(II) ion is also coordinated by one oxygen atom of the second carboxylate group and the hetero-ring nitrogen atom belonging to the same ligand. Both calcium ions in a dimer are bridged to the Ca(II) ions in adjacent dimers by a pair of water molecules, forming infinite molecular ribbons. In addition, each Ca(II) ion is coordinated by two water molecules. The coordination polyhedron around the Ca(II) ion is a pentagonal bipyramid with two apices above and one apex below the equatorial plane. Six solvation water molecules and two pyrazine-2,6-dicarboxylic acid molecules per unit cell interact via a system of hydrogen bonds with the molecular ribbons.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
