title: Facile self-assembly of neutral dendritic metallocycles via oxygen-to-platinum coordination.
abstract: A new approach for the fabrication of neutral dendritic metallocycles is described. By combining rigid 120 degrees dicarboxylate donor linkers funtionalized with [G0]-[G3] Frechet-type dendrons and complementary rigid 60 degrees and 120 degrees di-Pt(II) acceptor subunits, neutral rhomboidal metallodendrimers and hexagonal metallodendrimers, respectively, were prepared under mild conditions in high yields. The assemblies have well-defined shapes and sizes and were characterized by multinuclear NMR ((1)H and (31)P), mass spectrometry (ESI (+)-TOF-MS and APPI(+)-TOF-MS), and elemental analysis. Isotopically resolved mass spectrometry data support the formation of the neutral [2 + 2] rhomboidal, and [3 + 3] hexagonal metallodendrimers, and NMR data are consistent with the formation of all ensembles. The structures of the [G0] and [G1] neutral rhomboidal metallodendrimers (3a and 3b) were unambiguously confirmed via single-crystal X-ray crystallography. The shape and size of [G3] neutral hexagonal metallodendrimer 5d was established with MMFF force-field simulations.
authors.affiliation: Shanghai Key Laboratory of Green Chemistry and Chemical Processes, Department of Chemistry, East China Normal University, 3663 North Zhongshan Road, Shanghai 200062, China. hbyang@chem.ecnu.edu.cn
authors.forename: Hai-Bo
authors.initials: HB
authors.lastname: Yang
authors.forename: Brian H
authors.initials: BH
authors.lastname: Northrop
authors.forename: Yao-Rong
authors.initials: YR
authors.lastname: Zheng
authors.forename: Koushik
authors.initials: K
authors.lastname: Ghosh
authors.forename: Peter J
authors.initials: PJ
authors.lastname: Stang
mesh_terms: D018360:Crystallography, X-Ray; D050091:Dendrimers / Q000138:chemical synthesis* / Q000737:chemistry; D006844:Hydrocarbons, Cyclic / Q000138:chemical synthesis* / Q000737:chemistry; D009682:Magnetic Resonance Spectroscopy; D013058:Mass Spectrometry; D008958:Models, Molecular; D009942:Organometallic Compounds / Q000138:chemical synthesis* / Q000737:chemistry; D010100:Oxygen / Q000737:chemistry*; D010984:Platinum / Q000737:chemistry*; D021241:Spectrometry, Mass, Electrospray Ionization; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization; D013696:Temperature
chemical_list: D050091:Dendrimers; D006844:Hydrocarbons, Cyclic; D009942:Organometallic Compounds; D010984:Platinum; D010100:Oxygen
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