A pH Switchable Pseudorotaxane Based on a Metal Cage and a Bis‐anionic Thread

Metal ions in the synthesis of interlocked molecules and materials

“…Using this approach, Clever and Shionoya produced one of the largest rotaxanes reported to date (Fig 13a). 64 [7]catenane structure with the naphthalene diimide units threading through the macrocycles (Fig 14). 66 Interestingly, when a smaller tetrahedral cage was prepared, steric constraints prevented saturation of the naphthalene diimide sites, with evidence of only two macrocycles being incorporated into the assembly.…”

Stepwise Halide‐Triggered Double and Triple Catenation of Self‐Assembled Coordination Cages

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A simple self-assembled [Pd 2 L 4 ] coordination cage consisting of four carbazole-based ligands was found to dimerize into the interpenetrated double cage [3 X@Pd 4 L 8 ] upon the addition of 1.5 equivalents of halide anions (X = Cl À , Br À ). [5] Furthermore, the temporal and spatial control of structural rearrangements and encapsulation processes by the addition of external triggers, [6] a change in pH [7] or electrochemical potential, [8] and irradiation with light [9] is of high current interest.With regard to self-assembled coordination cages, [10] we and others have provided first examples implementing controllable elements such as light-switchable ligands [11] and redox-active functionalities [12] within the last couple of years. The subsequent addition of larger amounts of the same halide triggers another structural conversion, now yielding a triply catenated link structure in which each Pd II node is trans-coordinated by two pyridine donors and two halide ligands.

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“…[1] Such artificial model systems are often based on supramolecular self-assembly which utilizes the formation of complex structures from simple building blocks containing a preprogrammed connectivity. [5] Furthermore, the temporal and spatial control of structural rearrangements and encapsulation processes by the addition of external triggers, [6] a change in pH [7] or electrochemical potential, [8] and irradiation with light [9] is of high current interest. [4] The realization of advanced topologies such as knots and links in the form of self-assembled architectures is another subtopic in this area.…”

Ion-pair recognition by a neutral [2]rotaxane based on a bis-calix[4]pyrrole cyclic component

“…macrocycle 1 , 14 linear component 2b and stopper 4 , 24 Fig. 1) were performed by following or adapting synthetic procedures described in literature (see ESI† for experimental details).…”