Calculation of nuclear spin-spin coupling constants using frozen density embedding
- Department of Chemistry, University at Buffalo, State University of New York, Buffalo, New York 14260-3000 (United States)
- Amsterdam Center for Multiscale Modeling (ACMM), VU University Amsterdam, Theoretical Chemistry, De Boelelaan 1083, 1081 HV Amsterdam (Netherlands)
We present a method for a subsystem-based calculation of indirect nuclear spin-spin coupling tensors within the framework of current-spin-density-functional theory. Our approach is based on the frozen-density embedding scheme within density-functional theory and extends a previously reported subsystem-based approach for the calculation of nuclear magnetic resonance shielding tensors to magnetic fields which couple not only to orbital but also spin degrees of freedom. This leads to a formulation in which the electron density, the induced paramagnetic current, and the induced spin-magnetization density are calculated separately for the individual subsystems. This is particularly useful for the inclusion of environmental effects in the calculation of nuclear spin-spin coupling constants. Neglecting the induced paramagnetic current and spin-magnetization density in the environment due to the magnetic moments of the coupled nuclei leads to a very efficient method in which the computationally expensive response calculation has to be performed only for the subsystem of interest. We show that this approach leads to very good results for the calculation of solvent-induced shifts of nuclear spin-spin coupling constants in hydrogen-bonded systems. Also for systems with stronger interactions, frozen-density embedding performs remarkably well, given the approximate nature of currently available functionals for the non-additive kinetic energy. As an example we show results for methylmercury halides which exhibit an exceptionally large shift of the one-bond coupling constants between {sup 199}Hg and {sup 13}C upon coordination of dimethylsulfoxide solvent molecules.
- OSTI ID:
- 22253449
- Journal Information:
- Journal of Chemical Physics, Journal Name: Journal of Chemical Physics Journal Issue: 10 Vol. 140; ISSN JCPSA6; ISSN 0021-9606
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
CARBON 13
COUPLING CONSTANTS
DEGREES OF FREEDOM
DENSITY
DENSITY FUNCTIONAL METHOD
DMSO
ELECTRON DENSITY
ENVIRONMENTAL EFFECTS
HYDROGEN
KINETIC ENERGY
MAGNETIC FIELDS
MAGNETIC MOMENTS
MAGNETIZATION
MERCURY 199
METHYLMERCURY
NUCLEAR MAGNETIC RESONANCE
PARAMAGNETISM
SOLVENTS
SPIN
STRONG INTERACTIONS