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The trans influence in unsymmetrical pincer palladacycles: an experimental and computational study

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posted on 2023-06-09, 02:35 authored by Sarote Boonseng, Gavin W Roffe, Rhiannon N Jones, Graham J Tizzard, Simon J Coles, John SpencerJohn Spencer, Hazel CoxHazel Cox
A library of unsymmetrical SCN pincer palladacycles, [ClPd{2-pyr-6-(RSCH2)C6H3}], R = Et, Pr, Ph, p-MePh, and p-MeOPh, pyr = pyridine, has been synthesized via C–H bond activation, and used, along with PCN and N’CN unsymmetrical pincer palladacycles previously synthesized by the authors, to determine the extent to which the trans influence is exhibited in unsymmetrical pincer palladacycles. The trans influence is quantified by analysis of structural changes in the X-ray crystal and density functional theory (DFT) optimized structures and a topological analysis of the electron density using quantum theory of atoms in molecules (QTAIM) to determine the strength of the Pd-donor atom interaction. It is found that the trans influence is controlled by the nature of the donor atom and although the substituents on the donor-ligand affect the Pd-donor atom interaction through the varied electronic and steric constraints, they do not influence the bonding of the ligand trans to it. The data indicate that the strength of the trans influence is P > S > N. Furthermore, the synthetic route to the family of SCN pincer palladacycles presented demonstrates the potential of late stage derivitization for the effective synthesis of ligands towards unsymmetrical pincer palladacycles.

Funding

Thai Government

History

Publication status

  • Published

File Version

  • Published version

Journal

Inorganics

ISSN

2304-6740

Publisher

MDPI

Issue

25

Volume

4

Page range

1-14

Department affiliated with

  • Chemistry Publications

Full text available

  • Yes

Peer reviewed?

  • Yes

Legacy Posted Date

2016-08-17

First Open Access (FOA) Date

2016-08-17

First Compliant Deposit (FCD) Date

2016-08-16

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