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transplatin IS able to form coordination complex with DNA, but only one. The middle bond on the cisplatin and transplatin molecule prevents rotation in the molecule so transplatin can only form a coordination complex on one side, but the other side is facing the other way and can't rotate to form a second coordination complex. transplatin, on the other hand, has two places (NH3) where it can form coordination compounds, and thus it's bond with DNA is stronger. since it can stay on the DNA, it prevents it from unraveling and thus allowing the cell to duplicate.
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