NMR J-Coupling Constants in Cisplatin Derivatives Studied by Molecular Dynamics and Relativistic DFT
| Autor: | Kiplangat Sutter, Lionel A. Truflandier, Jochen Autschbach |
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| Rok vydání: | 2011 |
| Předmět: |
Coupling constant
Magnetic Resonance Spectroscopy Chemistry Antineoplastic Agents Nuclear magnetic resonance spectroscopy Molecular Dynamics Simulation J-coupling Molecular physics Atomic and Molecular Physics and Optics Hybrid functional Molecular dynamics Ab initio quantum chemistry methods Solvents Quantum Theory Physical chemistry Density functional theory Cisplatin Physics::Chemical Physics Physical and Theoretical Chemistry Solvent effects |
| Zdroj: | ChemPhysChem. 12:1448-1455 |
| ISSN: | 1439-4235 |
| Popis: | Solvent effects on J(Pt-195 - N-15) one-bond nuclear spin-spin coupling constants (J(PtN)) of cisplatin [cis-diamminedichloroplatinum(II)] and three cisplatin derivatives are investigated using a combination of density functional theory (DFT) based ab initio molecular dynamics (aiMD) and all-electron relativistic DFT NMR calculations employing the two-component relativistic zeroth-order regular approximation (ZORA). Good agreement with experiment is obtained when explicit solvent molecules are considered and when the computations are performed with a hybrid functional. Spin-orbit coupling causes only small effects on J(PtN). Key factors contributing to the magnitude of coupling constants are elucidated, with the most significant being the presence of solvent as well as the quality of the density functional and basis set combination. The solvent effects are of the same magnitude as J(PtN) calculated for gas-phase geometries. However, the trends of J(PtN) among the complexes are already present in the gas phase. Results obtained with a continuum solvent model agree quite well with the aiMD results, provided that the Pt solvent-accessible radius is carefully chosen. The aiMD results support the existence of a partial hydrogen-bond-like inverse-hydration-type interaction affording a weak (1)J(Pt center dot center dot center dot H-w) coupling between the complexes and the coordinating water molecule. |
| Databáze: | OpenAIRE |
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