Halide exchange studies of novel Pd() NNN-pincer complexes

Palladium( ii ) complexes with an NNN type pincer ligand (pip 2 NNN = 2,6-bis(piperdyl-methyl)pyridine) are synthesized and characterized. Electronic and 1 H NMR spectra point to decreasing filled/filled repulsions between the d(Pd) orbitals and the halide lone pair orbitals along the Cl < Br <...

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Vydáno v:RSC advances Ročník 9; číslo 44; s. 2573 - 25711
Hlavní autoři: Kuyuldar, Seher, Burda, Clemens, Connick, William B
Médium: Journal Article
Jazyk:angličtina
Vydáno: England Royal Society of Chemistry 15.08.2019
The Royal Society of Chemistry
Témata:
Absorption spectra
Anion exchanging
bromides
bromine
Chemistry
chlorides
iodine
Ligands
Negative ions
NMR spectroscopy
nuclear magnetic resonance spectroscopy
Orbitals
Palladium
pyridines
Spectrum analysis
ISSN:2046-2069, 2046-2069
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Shrnutí:Palladium( ii ) complexes with an NNN type pincer ligand (pip 2 NNN = 2,6-bis(piperdyl-methyl)pyridine) are synthesized and characterized. Electronic and 1 H NMR spectra point to decreasing filled/filled repulsions between the d(Pd) orbitals and the halide lone pair orbitals along the Cl < Br < I series. For all complexes, the most downfield -piperidyl resonance of the pip 2 NNN ligand is sensitive to changes in the coordinated halide while the meta -pyridyl and benzylic resonances are sensitive to changes in the counter anion. This sensitivity is utilized to study halide association and exchange at the fourth coordination site. Conductivity and 1 H NMR spectroscopy confirm the interaction between the exogenous anion (Cl , Br , BF 4 ) and Pd(pip 2 NNN)X + (X = Cl, Br). Halide exchange in palladium( ii ) complexes with NNN-type pincer ligands is investigated.
Bibliografie:Electronic supplementary information (ESI) available: Experimental section. Synthesis, UV visible absorption spectra and positive and negative ion spectra for the PdX
2
10.1039/c9ra05423e
4
salts. See DOI
6
X
and/or Pd
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William B. Connick passed away in 2018.
ISSN:2046-2069
2046-2069
DOI:10.1039/c9ra05423e