We report the design and synthesis of a Cu(ii) metallocycle (1) and use the possibility to expand the Cu(ii) coordination sphere to self-assemble mechanically interlocked species via interpenetration. Metallocycle 1 can be used as a platform to reversibly assemble a 1D + 1D -> 1D coordination-driven polyrotaxane (3), where 1 acts as the hosting ring as well as the stopper, and 4,4?-bipyridine is the guest-axle. A coordinating solvent can substitute the 4,4?-bipyridine axle to disassemble the polyrotaxane (3 -> 2) that is easily restored by further adding 4,4?-bipyridine (2 -> 3). Other polyrotaxanes can be isolated by reacting 1 with pyridine (4) and phenylpyridine (5). Interconversion among the presented species is demonstrated and ensured by the open position of each copper center in platform 1.
A Cu(ii) metallocycle for the reversible self-assembly of coordination-driven polyrotaxane-like architectures
Tessarolo J;Quici S;Armelao L;Rancan M
2018
Abstract
We report the design and synthesis of a Cu(ii) metallocycle (1) and use the possibility to expand the Cu(ii) coordination sphere to self-assemble mechanically interlocked species via interpenetration. Metallocycle 1 can be used as a platform to reversibly assemble a 1D + 1D -> 1D coordination-driven polyrotaxane (3), where 1 acts as the hosting ring as well as the stopper, and 4,4?-bipyridine is the guest-axle. A coordinating solvent can substitute the 4,4?-bipyridine axle to disassemble the polyrotaxane (3 -> 2) that is easily restored by further adding 4,4?-bipyridine (2 -> 3). Other polyrotaxanes can be isolated by reacting 1 with pyridine (4) and phenylpyridine (5). Interconversion among the presented species is demonstrated and ensured by the open position of each copper center in platform 1.File | Dimensione | Formato | |
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Descrizione: A Cu(II) metallocycle for the reversible self-assembly of coordination-driven polyrotaxane-like architectures
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