Silver complexes pyrazine

Table 18 Thermodynamic Data for the Formation of some Silver(I) Pyrazine Complexes (0.1 M KN03, 25 Q100...

Benzylamino-2-methyl-s-triazolo[l,5-a]pyrazine (12) has been found to possess marked cytokinin activity. The only patent on this ring system claims various silver complexes as heat-developable, light-sensitive materials. ... 

Allen, F. H., Kennard, 0., and Taylor, R., Systematic analysis of structural data as a research technique in organic chemistry, Acc. Chem. Res., 16, 146-153 (1983). Vranka, R. G., and Amma, E. L., Metal ion-aromatic complexes. II. The crystal structure of the 1 1 silver nitrate-pyrazine complex, Inorg. Chem., 5, 1020-1025 (1966). Kubel, F, and Strahle, J., Crystal structure of polymeric bis(dismethyl-glyoximato)pyrazine iron (II), Z Naturforsch. B, 38, 258-259 (1983). 

This method can be used with heteroaromatic bases, such as thiazoles or pyrazines, which complex with the silver salt and reduce its catalytic activity. A disadvantage of the method is that the heteroaromatic base can be only partially protonated under these conditions. 

Silver(I) complexes of pyrazine were first reported in 1895." Since then there have been numerous reports on the preparation and properties of pyrazine complexes of silver(I).85 Thermodynamic data for some of these complexes are given in Table 18. 

Pyrazine derivatives were again popular as ligands in crystallographic studies of transition metal complexes. These complexes included silver(I) alkylpyrazine sulfonates 83 <07IC7299>, tetrakis[3-(pyrazin-2-yloxy)pyridinc-AiVJdithiocyanatomanganese <07AX(E)m441>,... 

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