title: Ambidentate ligands capable of variable bond angles in the coordination-driven self-assembly of discrete Pt macrocycles.
abstract: Flexible, ambidentate pyridyl-carboxylate based donor ligands such as sodium 3-(3-pyridyl)benzoate, sodium 4-(3-pyridyl)benzoate, and potassium 4-(3-pyridyl)ethynylbenzoate self-assemble into discrete [2 + 2] macrocyclic species instead of infinite networks when combined with a 90 degrees platinum-containing acceptor. In each case, only one isomeric ensemble is selectively formed in high yield. All products are characterized by electrospray ionization mass spectrometry (ESI-MS) and 31P{1H} and 1H NMR spectroscopy. They are the first examples of discrete supramolecules incorporating flexible, ambidentate donor ligands. Despite their potential versatility, these pyridyl-carboxylate donors adjust their bonding directionality to accommodate a rigid platinum acceptor in the formation of one discrete ensemble.
authors.affiliation: Department of Chemistry, University of Ulsan, Ulsan 680-749, Republic of Korea. kwchi@ulsan.ac.kr
authors.forename: Ki-Whan
authors.initials: KW
authors.lastname: Chi
authors.forename: Chris
authors.initials: C
authors.lastname: Addicott
authors.forename: Mi-Eun
authors.initials: ME
authors.lastname: Moon
authors.forename: Hyo Jin
authors.initials: HJ
authors.lastname: Lee
authors.forename: Sung Chul
authors.initials: SC
authors.lastname: Yoon
authors.forename: Peter J
authors.initials: PJ
authors.lastname: Stang
mesh_terms: D008024:Ligands; D047028:Macrocyclic Compounds / Q000138:chemical synthesis* / Q000737:chemistry; D009682:Magnetic Resonance Spectroscopy; D015394:Molecular Structure; D017671:Platinum Compounds / Q000138:chemical synthesis* / Q000737:chemistry; D021241:Spectrometry, Mass, Electrospray Ionization
chemical_list: D008024:Ligands; D047028:Macrocyclic Compounds; D017671:Platinum Compounds