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Experimental and first-principles NMR analysis of Pt(II) complexes with O,O′-dialkyldithiophosphate ligands

Roukala, Juho; Orr, Simon T.; Hanna, John V.; Vaara, Juha; Ivanov, Alexander V.; Antzutkin, Oleg N.; Lantto, Perttu (2016-09-30)

 
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URL:
https://doi.org/10.1021/acs.jpca.6b09586

Roukala, Juho
Orr, Simon T.
Hanna, John V.
Vaara, Juha
Ivanov, Alexander V.
Antzutkin, Oleg N.
Lantto, Perttu
American Chemical Society
30.09.2016

Roukala, J., Orr, S., Hanna, J., Vaara, J., Ivanov, A., Antzutkin, O., Lantto, P. (2016) Experimental and First-Principles NMR Analysis of Pt(II) Complexes With O,O′-Dialkyldithiophosphate Ligands. Journal of Physical Chemistry A, 120 (42), 8326-8338. doi:10.1021/acs.jpca.6b09586

https://rightsstatements.org/vocab/InC/1.0/
© 2016 American Chemical Society. Published in this repository with the kind permission of the publisher.
https://rightsstatements.org/vocab/InC/1.0/
doi:https://doi.org/10.1021/acs.jpca.6b09586
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Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi-fe201801031045
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Abstract

Polycrystalline bis(dialkyldithiophosphato)Pt(II) complexes of the form [Pt{S₂P(OR)₂}₂] (R = ethyl, iso-propyl, iso-butyl, sec-butyl or cyclo-hexyl group) were studied using solid-state ³¹P and ¹⁹⁵Pt NMR spectroscopy, to determine the influence of R to the structure of the central chromophore. The measured anisotropic chemical shift (CS) parameters for ³¹P and ¹⁹⁵Pt afford more detailed chemical and structural information, as compared to isotropic CS and J couplings alone. Advanced theoretical modeling at the hybrid DFT level, including both crystal lattice and the important relativistic spin–orbit effects qualitatively reproduced the measured CS tensors, supported the experimental analysis, and provided extensive orientational information. A particular correction model for the non-negligible lattice effects was adopted, allowing one to avoid a severe deterioration of the ¹⁹⁵Pt anisotropic parameters due to the high requirements posed on the pseudopotential quality in such calculations. Though negligible differences were found between the ¹⁹⁵Pt CS tensors with different substituents R, the ³¹P CS parameters differed significantly between the complexes, implying the potential to distinguish between them. The presented approach enables good resolution and a detailed analysis of heavy-element compounds by solid-state NMR, thus widening the understanding of such systems.

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