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

100%

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

Polish Journal of Chemistry

1998

tom 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.

The effect of substituted amides of pyrazine-2-carboxylic acids on flavonolignan production in Silybum marianum culture in vitro

51%

Tumova L. , Gallova K. , Rimakova J. , Dolezal M. , Tuma J.

Acta Physiologiae Plantarum

2005

tom 27

nr 3B

In vitro plant tissue and cell cultures were used to study herbicide effects on growth, selected metabolic activities and other phenomena. The effect of abiotic elicitors, two newly synthesized substituted amides of pyrazine-2-carboxylic acids (synthesized at the Department of Pharmaceutical Chemistry and Drug Control, School of Pharmacy in Hradec Kralove), on the flavonolignan accumulation in callus and suspension culture of Silybum marianum (L.) Gaertn. was investigated. The compounds markedly influenced production of flavonolignans in an in vitro culture. Particularly after the elicitation with a solution of compound 3-methylamide 5-tert-butylpyrazine- -2-carboxylic acid at a concentration of 3.71x10-7 moll-1 and within 72 h of elicitation, an increase in flavonolignan production by 893 % in suspension culture versus control took place. The flavonolignan accumulation in callus culture after the elicitation with a solution of 5-brom-2-hydroxyphenylamide of 5-tert-butyl-6-chloropyrazine-2-carboxylic acid was also increased by about 1039 % (24 hour elicitation and concentration of 2.59x10-4 moll-1 ).