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Mole-Ratio-Dependent Reversible Transformation between 2:2 and Cyclic 3:6 Silver(I) Complexes with an Argentivorous Molecule

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journal contribution
posted on 14.01.2021, 17:20 by Huiyeong Ju, Tomoko Abe, Yukari Takahashi, Yumiko Tsuruoka, Akihiro Otsuka, Eunji Lee, Mari Ikeda, Shunsuke Kuwahara, Yoichi Habata
A tetra-armed cyclen (L) with two substituted 3,5-difluorobenzyl and two substituted pyridine-4-yl methyl groups at the 1,4- and 7,10-positions of the cyclen ring as side arms was synthesized. When L was reacted with 1 equiv of the silver­(I), ­di­metallo­[3.3]­para­cyclophane-like 2:2 cyclic dimer, [Ag2(L)2]­(PF6)2, was obtained. The reaction of L with 2 equiv of silver­(I) gave a 3:6 cyclic trimer, [Ag6(L)3(CH3CN)3]­(OTf)6·3CH3CN. Furthermore, reversible complexation between the 2:2 cyclic dimer and 3:6 cyclic trimer was confirmed by 1H NMR and the CSI mass in the addition of silver­(I) or the [2.2.2]­cryptand.