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Two-dimensional molecular pattern in the structure of a calcium(II) complex with pyrazine-2,3-dicarboxylate and water ligands

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The structure of di(aquo- O )(pyrazine-2,3-dicarboxylato- N , O ; - O ', O '') calcium(II) hydrate [Ca(2,3-PZDC)(H2O)2ยท;H2O] contains molecular sheets in which Ca(II) ions are bridged by the carboxylate groups of the ligand molecules. Two bridging paths are evident. In the first, an N,O-bonding moiety formed by a hetero-ring nitrogen atom and the carboxylate oxygen atom nearest to it and both oxygen atoms of the second carboxylic group are active. The second path is formed by the other oxygen atom from the carboxylic group involved in the N,O-bonding moiety and an oxygen atom from the second carboxylic group. The latter atom is bidentate. A two-dimensional molecular pattern is formed. Each Ca(II) ion is also coordinated by two water oxygen atoms, making the number of coordinated atoms eight. The coordination polyhedron is a distorted pentagonal bipyramid with an oxygen atom at the apex on one side of the equatorial plane and two oxygen atoms forming the apices on the other side.
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Keywords: Calcium(II); Molecular sheets; Pyrazine-2,3-dicarboxylate; Structure

Document Type: Research Article

Affiliations: Institute of Nuclear Chemistry and Technology, Warsaw, Poland

Publication date: July 20, 2005

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