NMR spectroscopy, ligand's influence

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The discussion centers on the influence of ligands on metal NMR shifts in palladium complexes with two amine ligands and two chlorides, focusing on cis and trans geometries. In DMF, the chemical shift differences for cyclic amines, such as cyclopropyl and cyclohexyl, are minimal, with trans compounds exhibiting more shielding. Conversely, for complexes with NH3, MeNH2, or adamantylamine ligands, trans configurations are more deshielded than cis, particularly pronounced in adamantylamine compounds. The conversation raises questions about the nature of the complexes and their electronic configurations, specifically referencing d8 configurations.
KarolinaPL
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Hi,

i have been wondering about the influence of the ligands on metal NMR shifts, for complexes with metal like Pd, the ligands are 2 amine ligands, and they have also two chlorides in structure, cis or trans geometry. In DMF, when comparing the difference between the chemical shifts of the same complexes (the same ligands) but with different geometry, for cyclic amines like cyclopropyl-cyclohexyl, is small, and trans-compounds signal are more shielded. The opposite situation is for ths type of coplex with NH3, MeNH2 or Adamantylamine ligands, trans more deshielded than cis, and the difference between cis and trans is biggest for adamantylamine compounds, while for rest is veeery small. What can be the reason?
Greetings.
 
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What is a ths type of complex? What electronic configuration/ charge you are talking about (d8)?
 

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