540770-63-6Relevant academic research and scientific papers
Irreversible but Noncovalent Ru(II)-Pyridine Bond: Its Use for the Formation of [2]-Catenanes
Colasson,Sauvage
, p. 1895 - 1901 (2004)
The reaction between ligand 1, which consists of two terminal pyridines attached to a central 1,10-phenanthroline (phen), and the complex Ru(phen) 2(CH3CN)2(PF6)2 has been studied. A new ruthenium containing metallamacrocycle has been obtained and fully characterized. Despite the relatively poor yield for the cyclization process involving the ruthenium center (20percent), this strategy led to the synthesis of two different kinds of [2]-catenane. The first example reported in this article is a bimetallic Cu(I)/Ru(II) catenane 53+ consisting of a purely organic ring interlocked with the ruthenium(II)-incorporating metallacycle. Complex 53+ was selectively demetalated at the Cu(I) center to lead to the free Ru(II)-containing catenane. A trimetallic Ru(II)/Cu(I)/Ru(II) catenane 85+ was also synthesized showing that this approach is reliable and promising for the elaboration of photoactive multicomponent systems.
Quantitative formation of [2]catenanes using copper(I) and palladium(II) as templating and assembling centers: The entwining route and the threading approach
Dietrich-Buchecker, Christiane,Colasson, Benoit,Fujita, Makoto,Hori, Akiko,Geum, Neri,Sakamoto, Shigeru,Yamaguchi, Kentaro,Sauvage, Jean-Pierre
, p. 5717 - 5725 (2007/10/03)
Transition metal-mediated templating and self-assembly have shown powerful potentials for the synthesis of interlocked molecules. These two strategies were combined in designing and preparing a new 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) clipping) and the threading approach (Cu(I)-templated threading of a cyclic ligand on an acyclic ligand followed by the PD(II) clipping of the second ring). In the former method, stepwise treatment of 1 with Cu(CH3CN)4PF6 (templating center) and enPd(NO3)2 (assembling center) gives rise to the quantitative formation of CuPd2 catenane 18. In the latter method, Cu(I) templates the threading of phenanthroline-containing macrocycle 2 on ligand 1, which is followed by Pd(II) clipping to give hetero catenane 20. In both approaches, the formation of catenanes is convincing thanks to the strong templating effect of Cu(I), while the ring closure steps are efficiently furnished by Pd(II)-directed self-assembly.
