RESUMO
A series of neutral, platinum-based macrocycles was synthesized from rigid oxygen donor building blocks via self-assembly. The combination of a platinum-based 60 degrees acceptor unit 1 with several linear and angular dicarboxylate bridging ligands afforded hitherto unknown neutral platinum-based supramolecular triangles and rhomboids. In addition, a similar reaction of the diplatinum molecular clip 6 and three different linear dicarboxylates led to the formation of neutral molecular rectangles. Most of the macrocycles were characterized by X-ray single-crystal structure analysis, and, in all cases, NMR spectra were consistent with the formation of single highly symmetrical species.
Assuntos
Benzopirenos/química , Compostos Organoplatínicos/química , Compostos Organoplatínicos/síntese química , Cristalografia por Raios X , Ciclização , Substâncias Macromoleculares , Espectroscopia de Ressonância Magnética , Modelos Moleculares , Estrutura Molecular , Platina/química , TermogravimetriaRESUMO
Discrete, nanoscopic 3-D cages are prepared in high yield via coordination-driven self-assembly from a variety of building blocks, including bidentate 3-substituted pyridines, chiral, and silicon-based tripods. All are characterized by NMR ((31)P, (1)H) and electrospray ionization mass spectrometry.
Assuntos
Piridinas/química , Ligantes , Espectroscopia de Ressonância Magnética/métodos , Estrutura Molecular , Nanotecnologia , Compostos de Organossilício/química , Espectrometria de Massas por Ionização por Electrospray , EstereoisomerismoRESUMO
The self-assembly of three nanoscopic prisms of approximate size 1 x 4 nm is reported. Tetrahedral carbon, silicon, and phosphorus were used as structure-defining elements in these coordination-based cages. A carbon-based assembly completes a pair of nanoscopic complementary 3-D structures. The formation of the structures is supported by multinuclear NMR, ESI FT-ICR mass spectrometry, and elemental analysis data.
Assuntos
Antracenos/química , Derivados de Benzeno/química , Reagentes de Ligações Cruzadas/química , Compostos Organofosforados/química , Compostos de Organossilício/química , Antracenos/síntese química , Derivados de Benzeno/síntese química , Reagentes de Ligações Cruzadas/síntese química , Cristalografia por Raios X , Análise de Fourier , Espectroscopia de Ressonância Magnética , Modelos Moleculares , Estrutura Molecular , Compostos Organofosforados/síntese química , Compostos de Organossilício/síntese química , Espectrometria de Massas por Ionização por ElectrosprayRESUMO
The design and self-assembly of three supramolecular triangles is described. A novel 60 degrees corner unit directs the exclusive formation of triangular assemblies that are not in detectable equilibrium with other macrocycles. The resulting triangles have sides ranging from 2.7 to 3.5 nm in length and molecular masses as high as 5396 amu. The crystal structure of one of the assemblies shows an approximately 1.4 nm cavity; the crystal packing forms open, triangular channels. The characterization of the supramolecular triangles by multinuclear NMR, elemental analysis, and electrospray mass spectrometry is also reported.
Assuntos
Compostos Organoplatínicos/química , Fenantrenos/química , Reagentes de Ligações Cruzadas/química , Cristalografia por Raios X , Etilenos/química , Espectroscopia de Ressonância Magnética , Espectrometria de Massas , Modelos Moleculares , Conformação Molecular , Fenantrenos/síntese química , Piridinas/químicaRESUMO
A family of nanoscale-sized supramolecular cage compounds with a trigonal prismatic framework was prepared by means of spontaneous self-assembly from the combination of a predesigned molecular "clip" with tritopic pyridyl subunits. As confirmed by x-ray crystallography, the smallest structure of the reported series is approximately 1 x 2 nm and possesses a nitrate anion incarcerated inside its molecular cavity. The largest structure has dimensions of approximately 1 x 4 nm.
