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1 1998

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Monomeric molecules in the isostructural calcium(II) and strontium(II) complexes with pyrazine-2-carboxylic acid

Ptasiewicz-Bąk H., Ostrowski A., Leciejewicz J.

Polish Journal of Chemistry

1998

Vol. 72, nr 8

2014-2023

The crystals of cis-tetraquobis(pyrazine-2-carboxylato-O,N)calcium(II) contain monomeric molecules, in which the calcium ion has a distorted dodecahedral coordination, formed by four water molecules (mean Ca-O = 2.441 A), two oxygen atoms from monodentate carboxylic groups of two pyrazinic acid molecules (mean Ca-O = 2.458 A) and two nitrogen atoms located next to the above carboxylic groups (mean Ca-N = 2.619 A). In the crystals of cis-tetraquobis(pyrazine-2-carboxylato-O,N)strontium(II) the coordination of the Sr(2+) ion is identical with that of the calcium complex, the corresponding mean distances being Sr-O(water) 2.572 A, Sr-O 2.588 A, Sr-N 2.751 A. The monomeric molecules of both compounds are linked via a network of hydrogen bonds.