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Relevant academic research and scientific papers

Strapped-porphyrin-based molecular turnstiles

The synthesis of a series of molecular turnstiles that contained both H-bond-donor and -acceptor sites was achieved. Their structures were based on tetra-aryl X2SnIV porphyrins (X=Cl or OH) as H-bond-acceptor sites that were equipped with a rotor that contained a pyridyldiamide moiety as a H-bond donor. In the solution phase, 1D and 2D NMR spectroscopic analysis showed that switching between the closed state, which resulted from the formation of intramolecular H-bonds, and the open state of the turnstile was achieved by using external H-bond-acceptor molecules, such as DMSO. The solid-state structure of the closed state of the turnstile was established by single-crystal X-ray diffraction. Re-turn to sender: Molecular turnstiles, which were based on strapped-type tetra-aryl X2Sn IV porphyrins (X=Cl or OH) that contained both H-bond-donor and -acceptor sites, were prepared; switching between their open and closed states was studied in solution by 1D and 2D NMR spectroscopy. Copyright