Assembly of Interlocked Superstructures with a Titanium Oxide Molecular Ring in Water

Abstract

[2]­Catenane, [2]­rotaxane, and [2]­pseudorotaxane based on a cyclic titanium oxide cluster, [Ti8O8(SO4)16]16– (Ti 8 ), and cyclic/linear alkylammonium cations are reported. Their syntheses, structures, spectroscopy, and stability in water were studied. These molecules were synthesized from and remained intact upon redissolution in acidic water. Hence, the cluster Ti 8 is a promising metal oxide ring that can be used as an inorganic analogue of crown ether to assemble inorganic–organic hybrid mechanical interlocked supramolecular assemblies in water.

New picolinate-functionalized titanium-oxide clusters: syntheses, structures and photocatalytic H2 evolution

“…Hence, the spectroscopic characteristics of a lyophilized solid sample may be utilized to deduce the speciation of solutes in the original solution. 22 Fig. 4 shows that the IR peaks of crystals of 1 at 1660, 1337, 1157, and 587 cm −1 are due to PA ligand, whereas those at 830, 758, and 690 cm −1 are attributable to Ti–O stretching vibrations.…”

Two solvent-dependent Al16 nanorings: design, synthesis and nonlinear optical limiting behavior

“…31 Jacobson et al and Wang et al reported [M 8 ] 16− (M = Cr and Fe) and [Ti 8 ] 16− with μ 2 -OH and μ 2 -SO 4 bridges. 32,33 (c) The cooperation between organic connectors and inorganic components constitutes a ring structure. Zhao et al reported on an Ln 7 ring constructed from 1,1′-cyclopropane-dicarboxylic acid and μ 3 -OH inorganic linkers (Ln = Gd and Dy).…”

A Systematic Crystallographic Study of the Host–Guest Interactions between Amines and Ti8 Polyoxotitanium Clusters

“…25 Fu and Wang reported, respectively, that linear and cyclic amines can be hosted by Ti 8 wheel clusters to form pseudo-rotaxane or catenane-like structures. 26,27 Winpenny and co-workers isolated a family of cyclic [Ti x O (x+1) ] (x = 7, 8, or 9) clusters. The size of the rings was regulated by the alkylammonium cation, demonstrating the effect of the guests on host.…”