Poly[2]-catenanes containing alternating topological and covalent bonds
摘要:
A poly[2]-catenane containing interlocking 45-membered rings is synthesized; the polymer backbone includes alternating topological links and covalent bonds.
Poly[2]-catenanes containing alternating topological and covalent bonds
摘要:
A poly[2]-catenane containing interlocking 45-membered rings is synthesized; the polymer backbone includes alternating topological links and covalent bonds.
Quantitative Formation of [2]Catenanes Using Copper(I) and Palladium(II) as Templating and Assembling Centers: The Entwining Route and the Threading Approach
type of coordination catenanes incorporating Cu(I) and Pd(II) metal centers. The ligand designed here contains a phenanthroline core and pyridine sidearms (compound 1). Using this phenanthroline-pyridine conjugated ligand, two approaches were examined, which were shown to be surprisingly efficient for the catenane synthesis: the entwining route (entwining of two ligands around Cu(I) followed by Pd(II)
Large bifunctionalized catenate and catenand, composed of macrocycles containing 45 atoms, have been synthesized and copolymerized with a terephthalic acid derivative to afford a cyclic oligo[2]catenand and a linear poly[2]catenate. Poly[2]catenand was obtained by demetalation of poly[2]catenate. The molecular weight distribution of these polymers, which are composed of alternating topological and covalent bonds, has been characterized by gel permeation chromatography (GPC) with universal calibration, viscometry, and MALDI-TOF mass spectrometry, We were able to synthesize a poly[2]catenate and a poly[2]catenand with a degree of polymerization (DP) equal to 8-9. In addition. an upper value of the Kuhn segment length of poly[2]catenand has been determined and is discussed in the light of its structure.