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NMR J ‐Coupling Constants in Cisplatin Derivatives Studied by Molecular Dynamics and Relativistic DFT
Author(s) -
Sutter Kiplangat,
Truflandier Lionel A.,
Autschbach Jochen
Publication year - 2011
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.201000997
Subject(s) - chemistry , density functional theory , solvent effects , computational chemistry , coupling constant , solvent , molecule , relativistic quantum chemistry , hybrid functional , ab initio , atomic physics , quantum mechanics , physics , organic chemistry
Abstract Solvent effects on J ( 195 Pt 15 N) 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⋅⋅⋅H w ) coupling between the complexes and the coordinating water molecule.