Elucidation of Charge Contribution in Iridium-Chelated Hydrogen-Bonding Systems

Abstract

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We present two iridium complexes 1H+ and 2H+ that contain cationic ligands to extend the knowledge of charge-assisted hydrogen bonding (CAHB), which counts among the strongest non-covalent bonding interactions. Upon protonation, both complexes were converted into new hydrogen-bonding arrays with various selectivity for respective H-bonding partners. This study compares the association strengths of four hydrogen-bonding co-systems, emphasizing the roles of CAHB in supramolecular systems. We determined that the cationic charge in these systems contributed up to 2.7 kJ mol−1 in the H-bonding complexation processes.

Keywords

• H-bonding array
• charge-assisted
• ligand non-innocence
• non-covalent interactions
• self-assembly