Molecular dynamics study of solvation differences between cis- and transplatin molecules in water

The classical molecular dynamics (MD) simulations for the solvation properties of cis- and transplatins in water are performed with the Lennard-Jones plus Coulomb electrostatic potential parameters that are optimized with ab initio potential energies of the water-platin systems. Two hydration shells are found both for cis- and transplatins. The first shell of water molecules is closer to transplatin than cisplatin. The average number and lifetime of the intermolecular hydrogen bonds (HBs) estimated from the MD trajectories indicate that the Cl and NH(3) ligands are the main groups involved in the intermolecular HBs with water. In comparison with cisplatin, there are more HBs around transplatin and these HBs show the longer lifetime. The distinctly different solvation structures between cis- and transplatins are further revealed with the spatially anisotropic distributions of the first hydration shells.