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Double-armed and tetra-armed cyclen-based cryptands

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journal contribution
posted on 14.10.2016 by Mari Ikeda, Ajay Kumar Sah, Miki Iwase, Rina Murashige, Shunsuke Kuwahara, Yoichi Habata

Double-armed and tetra-armed cyclen-based cryptands (1a1d and 2) that bridge two aromatic rings by diethyleneoxy and triethyleneoxy units were prepared. The CSI-MS of 1:1 mixtures ([Ag+]/[ligand]) indicated that these new cryptands form 1:1 complexes with Ag+. The log K values for the interaction between Ag+ and 2 was greater than those of 1a1d, double-armed cyclens (3a3c and 4), and tetra-armed cyclen (5). The Ag+-ion-induced 1H NMR spectral changes suggest that the Ag+π interactions of the Ag+ complexes with the cryptands (1a1d and 2) are stronger than those in Ag+/double-armed and tetra-armed cyclens. To visualise the Ag+π interactions, the isosurfaces of the LUMO and HOMOs of the Ag+ complexes were calculated at the B3LYP/3–21G(*) theoretical level. The LUMO of the Ag+ ion is distorted by interaction with the HOMOs of the aromatic side arms. The calculations reveal Ag+π interactions between the Ag+ ion and the aromatic side arms, and these are shown graphically.