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Area of Science:

  • Organometallic Chemistry
  • Supramolecular Chemistry
  • Computational Chemistry

Background:

  • Intramolecular hydrogen bonds require conformational rearrangement.
  • Designing such bonds necessitates understanding molecular flexibility.

Purpose of the Study:

  • To apply conformational analysis principles for designing intramolecular hydrogen bonds in square-planar Pd(II) dichlorides.
  • To investigate the role of metallacycle size and unsaturation in accommodating intramolecular hydrogen bonds.

Main Methods:

  • Conformational analysis of palladium(II) dichloride complexes.
  • Synthesis and characterization of diprotic and monoprotic analogues (L1, L2, L3).
  • Distortion-interaction model analysis of hydrogen bonds.

Main Results:

  • Unsaturated six-membered metallacycles in Pd(II) complexes exhibit significant flexibility.
  • This flexibility facilitates the formation of intramolecular hydrogen bonds.
  • Small energies of rearrangement are key to accommodating intramolecular hydrogen bonding.

Conclusions:

  • Conformational analysis provides a framework for designing intramolecular hydrogen bonds.
  • Flexible metallacycles are crucial for accommodating intramolecular hydrogen bonding.
  • The study unifies various cases of intramolecular hydrogen bonding under a common mechanistic understanding.