A Flexible Copper(I)-Complexed [4]Rotaxane Containing Two Face-to-Face Porphyrinic Plates that Behaves as a Distensible Receptor

作者：Roche Cecile; Sour Angelique^*; Sauvage Jean Pierre

来源：Chemistry - A European Journal, 2012, 18(27): 8366-8376.

DOI：10.1002/chem.201200389

• copper
• host-guest systems
• porphyrinoids
• rotaxanes
• template synthesis

A new cyclic [4]rotaxane composed of two flexible bis-macrocycles and two rigid axles is described. Each bis-macrocycle consists of two rings attached to antipodal meso positions of a central Zn porphyrin through single C?C bonds. Each ring incorporates a 2,9-diphenyl-1,10-phenanthroline chelation site. The axles contain two coplanar bidentate sites derived from the 2,2%26apos;-bipyridine motif. The building blocks were assembled by using a one-pot threading-and-stoppering reaction, which afforded the [4]rotaxane in 50?% yield. The gathering-and-threading effect of copper(I) was utilised in the formation of a [4]pseudorotaxane, which was immediately converted to the corresponding [4]rotaxane by a quadruple CuAAC stoppering reaction. The rotaxane contains two face-to-face zinc porphyrins, which allowed the coordination of ditopic guest substrates. The rotaxane host showed remarkable flexibility and was able to adjust its conformation to the guest size. It can be distended and accommodate rod-like guests of 2.6 to 15.8 angstrom in length.

• 出版日期2012-7