Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8571, Japan.
Inorg Chem. 2009 Nov 16;48(22):10670-8. doi: 10.1021/ic901372k.
Four kinds of folded structures are formed upon the metal complexation of a bis(N(2)O(2)) ligand in which two oxime-type N(2)O(2) chelate ligands are connected by a flexible diethyleneoxy linker. The N(2)O(2) coordination sites are intended for d-block transition-metal ions, and the diethyleneoxy linker can interact with hard metal cations. Meso double helical, folded Omega-shaped, S-shaped helical, and single helical structures were formed depending on the metal combination. The difference in the affinity to metal cations resulted in variation of the folding modes and enabled the structural conversion between the folded structures.
四种折叠结构是在双（N(2)O(2)）配体与金属配位时形成的，其中两个肟型 N(2)O(2)螯合配体通过柔性二氧乙基桥连接。N(2)O(2)配位位点旨在与 d 区过渡金属离子配位，而二氧乙基桥可以与硬金属阳离子相互作用。根据金属组合，形成了介孔双螺旋、折叠的 Omega 形、S 形螺旋和单螺旋结构。对金属阳离子的亲和力的差异导致折叠模式的变化，并实现了折叠结构之间的结构转换。
