Conformational landscape of platinum(II)-tetraamine complexes: DFT and NBO studies

J Comput Aided Mol Des. 2010 Mar;24(3):225-35. doi: 10.1007/s10822-010-9328-6. Epub 2010 Mar 24.

Abstract

The potential energy surfaces of chiral tetraamine Pt(II) coordination complexes were computed at the B3LYP/LANL2DZ level of theory by a systematic variation of two dihedral angles: C12-C15-C34-C37 (theta) and C24-C17-C31-C48 (psi) employing a grid resolution of 30 degrees . Potential energy surfaces calculated using density functional theory methods and Boltzmann-derived populations revealed strong preference for one diasteromer of each series studied. In addition, natural bond orbital analysis show that the minima are stabilized predominantly by a combination of electronic interactions between two phenyl groups, the phenyl groups and the Pt(2+) ion, as well as with the amine groups. Additional experimental characterization of the diasteroisomers studied here is in progress and will permit further molecular modeling studies with the appropriate stereochemistry.

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

  • Computer Simulation*
  • Coordination Complexes / chemistry*
  • Models, Chemical*
  • Molecular Structure
  • Nitrogen Compounds / chemistry*
  • Platinum Compounds / chemistry*
  • Quantum Theory

Substances

  • Coordination Complexes
  • Nitrogen Compounds
  • Platinum Compounds
  • tetraammineplatinum(II)