title: Synthesis of light-harvesting dendrimers focally anchored with crown ethers or terpyridine ligands.
abstract: Crown ethers and terpyridine ligands have been successfully attached to the focal point of light harvesting phenylacetylene monodendrons through Pd-catalyzed coupling reactions. The structures of these functional monodendrons were characterized by 1H and 13C NMR spectroscopy, mass spectrometry and elemental analysis. Such binding-ligand anchored dendrons exhibit broad absorption, large molar extenction coefficients and high fluoresence quantum yields. Coordination of crown ethers with alkali ions results in a significant increase in absorption strength in the UV range, but little alteration in either intensity or position of fluorescence emission. Coordination of terpyridine ligands with Ru2+, however, does efficiently quench the fluorescence from the dendrons,albeit only the smallest dendron exhibits efficient binding.
authors.affiliation: Department of Chemistry, University of Missouri-Kansas City, MO 64110, USA.
authors.forename: Yongchun
authors.initials: Y
authors.lastname: Pan
authors.forename: Meng
authors.initials: M
authors.lastname: Lu
authors.forename: Zhonghua
authors.initials: Z
authors.lastname: Peng
authors.forename: Joseph S
authors.initials: JS
authors.lastname: Melinger
mesh_terms: D004988:Ethers, Cyclic / Q000737:chemistry*; D008024:Ligands; D009682:Magnetic Resonance Spectroscopy; D013058:Mass Spectrometry; D008956:Models, Chemical; D015394:Molecular Structure; D010777:Photochemistry; D010788:Photosynthesis; D011108:Polymers / Q000138:chemical synthesis* / Q000737:chemistry; D011725:Pyridines / Q000737:chemistry*; D012428:Ruthenium / Q000737:chemistry; D013050:Spectrometry, Fluorescence; D013056:Spectrophotometry, Ultraviolet
chemical_list: D004988:Ethers, Cyclic; D008024:Ligands; D011108:Polymers; D011725:Pyridines; D012428:Ruthenium