Synthesis, Characterization, and in Vitro Evaluation of a Potentially Selective Anticancer, Mixed-Metal [Ruthenium(III)−Platinum(II)] Trinuclear Complex

A new type of mixed-metal trinuclear complex containing platinum(II) and ruthenium(III) fragments that resemble
both cisplatin and NAMI-A has been synthesized and characterized by IR, 1H NMR, elemental analysis, and X-ray
crystallography. The water-soluble compound Na2{trans,cis,trans-[RuIIICl4(DMSO-S)(μ-pyz)]2PtIICl2} (AH-197, pyz
= pyrazine) was assessed for its effects on DNA mobility and toxicity against human cancer cell lines. When
compared to cisplatin and KP-1019 (which structurally resembles NAMI-A), IC50 results showed that AH-197 had
an intermediate toxicity. When this data was coupled with a subsequent COMPARE evaluation (standard COMPARE
queries resulted in insignificant correlation coefficients (<0.70) while very low COMPARE correlation coefficients
were found in the matrix queries as well), AH-197 yielded a correlation coefficient of 0.19 when compared to
cisplatin and 0.25 when compared to KP1019 indicating that AH-197 has a unique behavior.