Heads or Tails? Sandwich-Type Metallocomplexes of Hexakis(2,3-di-O-methyl)-alpha-cyclodextrin
| Authors | |
|---|---|
| Year of publication | 2020 |
| Type | Article in Periodical |
| Magazine / Source | Crystal Growth Design |
| MU Faculty or unit | |
| Citation | |
| Web | DOI: 10.1021/acs.cgd.0c00532 |
| Doi | http://dx.doi.org/10.1021/acs.cgd.0c00532 |
| Keywords | cyclodextrin;crystal structure;X-ray diffraction;metallocomplex |
| Description | Native and synthetically modified cyclodextrins (CDs) are useful building blocks in construction of large coordination complexes and porous materials with various applications. Sandwich-type complexes (STCs) are one of the important groups in this area. Usually, coordination of secondary hydroxyls or the “head” portal of native CD molecules to a notional multinuclear ring of metal cations leads to formation of head-to-head STCs. Our study introduces a new CD-ligand, hexakis(2,3-di-O-methyl)-alpha-cyclodextrin, which enables formation of intriguing head-to-head, but also novel tail-to-tail STCs. Homometallic silver-based head-to-head STCs, AgPF6-STC and AgClO4-STC, were obtained by coordination of ligand methoxy groups to six Ag+, while bulky counter-anions are located on the outside but also filling the inner space of infinite linear channels formed. In contrast, unique homometallic tail-to-tail RbF-STC was prepared by complexation of primary hydroxyls, “tails”, to twelve Rb+ tightly interconnected by twelve F- creating complex structure with accessible pores for potential gas adsorptions. |
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