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Charge-assisted phosph(v)azane anion receptors
Alex J Plajer1, Sanha Lee1, Andrew D Bond1
1Chemistry Department, Cambridge University, Lensfield Road, Cambridge CB2 1EW, UK. dsw1000@cam.ac.uk.
Dalton Transactions (Cambridge, England : 2003)
|March 5, 2020
Summary
Positively charged anion receptors based on cyclodiphosphazanes show enhanced anion affinity due to increased electrostatic interactions. Replacing selenium with a methyl group also boosts this effect.
Area of Science:
- Coordination chemistry
- Supramolecular chemistry
- Anion recognition
Background:
- Cyclodiphosphazanes are versatile scaffolds for host-guest chemistry.
- Tuning electronic properties of receptors impacts anion binding affinity.
Purpose of the Study:
- To investigate the anion binding properties of novel positively charged seleno-cyclodiphosph(v)azanes.
- To compare the anion affinity of neutral and positively charged receptors.
Main Methods:
- Synthesis of seleno-cyclodiphosph(v)azanes.
- Coordination of Cu(I) or Pd(II) to the phosphorus centers.
- Evaluation of anion binding affinity through changes in electrostatic interactions.
Main Results:
- Coordination of Cu(I) or Pd(II) to seleno-cyclodiphosph(v)azanes generates positively charged receptors.
- These positively charged receptors exhibit significantly increased anion affinity compared to neutral counterparts.
- Replacement of a P=Se unit with a P-Me+ unit mimics the effect of metal coordination, enhancing anion affinity.
Conclusions:
- Positively charged cyclodiphosphazane derivatives are effective anion receptors.
- Electrostatic interactions play a crucial role in enhancing anion binding.
- Structural modifications offer a viable strategy for tuning anion receptor performance.
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