Amino acid ester salt recognition by ferrocene-based ditopic receptor bearing oligoethylene glycol with pendant bipy subunits: CV, UV-vis and ESR studies
作者:Takashi Murashima、Sayo Tsukiyama、Satoshi Fujii、Kazuyuki Hayata、Hiroshi Sakai、Toshifumi Miyazawa、Takashi Yamada
DOI:10.1039/b511233h
日期:——
The novel ferrocene-based ditopic receptor 1 was synthesized. This receptor bears two oligoethylene glycol arms with pendant 2,2′-bipyridine unit at the identical cyclopentadienyl rings, CuI cation binds to 1 to form the 1 : 1 complex (1·CuI) with the cavity consisting of polyether, and the resulting complex acts as a receptor for amino acid ester salts to give the ditopic complex (1·CuI·AAOMe–HCl). The 1H NMR spectrum of 1·CuI·LeuOMe–HCl exhibits strong broadening at the bipyridine region, and the ESR spectrum of the same sample gives the signals assigned as CuII species. With these data, the binding of 1·CuI towards AAOMe·HCl leads to the conformational change, and the CuI complex is simultaneously oxidized to the CuII complex.
新型二萜基钴配合物受体1已被合成。该受体具有两个相同环戊二烯环上悬挂的2,2′-联吡啶单元,以及两个聚乙二醇臂。铜(I)离子与1结合形成1∶1的络合物(1·CuI),其空腔由聚醚构成,所得络合物作为氨基酸酯盐的受体,形成二萜基络合物(1·CuI·AAOMe–HCl)。1·CuI·LeuOMe–HCl的1H NMR谱在联吡啶区域展现出强烈的展宽,而相同样品的ESR谱给出了归属为CuII物种的信号。基于这些数据,1·CuI与AAOMe·HCl结合导致构象变化,同时CuI络合物被氧化为CuII络合物。