Molecular Structures of Dipeptide–Palladium(II) Conjugated Complexes

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<jats:title>Abstract</jats:title><jats:p>The chiral tridentate 2,6‐pyridinedicarboxamide ligand L<jats:sup>1</jats:sup>H<jats:sub>2</jats:sub> bearing two dipeptide chains (‐<jats:sc>L</jats:sc>‐Ala‐<jats:sc>L</jats:sc>‐Pro‐NHBu) was designed. Complexation of L<jats:sup>1</jats:sup>H<jats:sub>2</jats:sub> with Pd(OAc)<jats:sub>2</jats:sub> was demonstrated to afford the dipeptide–palladium(II) conjugated complex [(L<jats:sup>1</jats:sup>)Pd(MeCN)] (<jats:bold>1</jats:bold>) with an ancillary acetonitrile ligand. In the crystal packing of <jats:bold>1</jats:bold>, a right‐handed helical‐like molecular arrangement was observed, wherein each assembly is connected through continuous intermolecular hydrogen bonds together with water molecules. The dipeptide–palladium(II) conjugated complex <jats:bold>1</jats:bold> was studied as a metalloreceptor through metal coordination to accommodate a guest ligand, 4‐aminopyridine, resulting in the formation of the dipeptide–palladium(II) conjugated complex [(L<jats:sup>1</jats:sup>)Pd(4APy)] (<jats:bold>2</jats:bold>). Each preorganized helical molecule of <jats:bold>2</jats:bold> is packed in a right‐handed helical‐like molecular arrangement in the crystal packing. The dipeptide–palladium(II) conjugated complex <jats:bold>2</jats:bold> was found to exhibit emission with a maximum at 652 nm in the solid state.</jats:p>

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