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ABSTRACT.With the aim to improve and extend the antiviral activity of the antiherpic drug penciclovir, to a wider spectrum of viruses, we have synthesized and characterized new binary and ternary complexes of Pd(II) of formulae cis-(pen)2PdCl2 and cis-[(nucl)2Pd(pen)2]Cl, where nucl guanosine, inosine, cytidine or penciclovir. The characterization was mainly based on IR and 1H NMR spectroscopy, and the results showed that in all prepared complexes, penciclovir coordinates to the metal through N7. The far-i.r, spectrum of the complex cis-(pen)2PdCl2 conf'mned the cis-geometry around Pd(II). All the prepared complexes were markedly active against HSV-1 and HSV-2 strains, but not against thymidine kinase-deficient HSV-1 strains.

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