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Molecular Structures of Dipeptide–Palladium(II) Conjugated Complexes
Author(s) -
Moriuchi Toshiyuki,
Morimoto Kunihiro,
Sakamoto Yuki,
Hirao Toshikazu
Publication year - 2012
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201200155
Subject(s) - dipeptide , chemistry , palladium , conjugated system , ligand (biochemistry) , molecule , hydrogen bond , acetonitrile , stereochemistry , intermolecular force , crystal structure , crystallography , peptide , organic chemistry , catalysis , receptor , biochemistry , polymer
The chiral tridentate 2,6‐pyridinedicarboxamide ligand L 1 H 2 bearing two dipeptide chains (‐ L ‐Ala‐ L ‐Pro‐NHBu) was designed. Complexation of L 1 H 2 with Pd(OAc) 2 was demonstrated to afford the dipeptide–palladium(II) conjugated complex [(L 1 )Pd(MeCN)] ( 1 ) with an ancillary acetonitrile ligand. In the crystal packing of 1 , 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 1 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 1 )Pd(4APy)] ( 2 ). Each preorganized helical molecule of 2 is packed in a right‐handed helical‐like molecular arrangement in the crystal packing. The dipeptide–palladium(II) conjugated complex 2 was found to exhibit emission with a maximum at 652 nm in the solid state.