Assembly of superanion capsules of p-sulfonatothiacalix[4]arenes with transition metal ions and diaza-crown ether

Novel Highly Charged Silica-Coated Tb(III) Nanoparticles with Fluorescent Properties Sensitive to Ion Exchange and Energy Transfer Processes in Aqueous Dispersions

“…Another strategy is application of nanoparticles as nanosensors, which is attained by the encapsulation of pH- or substrate-sensitive dyes inside nanoparticles. As it was mentioned above, Tb(III)−TCAS complex is also pH dependent. , Moreover, Tb(III)−TCAS complex exhibits rather efficient complex ability toward organic molecules and metal complexes (Scheme ) due to the presence of the cavity, surrounded by sulfo-groups on the upper rim. − Such ternary complex formation can be detected through the change of luminophoric properties, if additional substrate serves as the antennae or quencher of Tb-centered luminescence. , As we previously showed, the binding of some Co(III) complexes with Tb(III)−TCAS quenchs Tb(III)-centered luminescence in aqueous media as a result of energy transfer processes . Thus the goal of the present work is to examine the effect of cations, which can quench the Tb-centered luminescence ([Co(dipy) 3 ] 3+ , [Co(NH 3 ) 6 ] 3+ , [Co(CN) 6 ] 3− , [Co(en) 2 ox] + ) of Tb(III)−TCAS-doped silica nanoparticles.…”

Outer-Sphere Association of p-Sulfonatothiacalix[4]arene and Tetrasulfonatomethylated Calix[4]resorcinarene with Cobalt(III) Tris(dipyridyl): The Effect on the Spectral and Electrochemical Properties of the Latter

“…The inclusion mode of [Co(dipy) 3 ] 3+ in the cavity of 1 4 - is similar to that of 1 5 - which is in accordance with above mentioned 1 H NMR data in solutions. The up−down face to face π-stacking interaction between the inclusion complexes of p -sulfonatothiacalix[4]arene units very often provides a so-called bilayer supramolecular structure. − The assembly of the inclusion complexes of 1 4 - with [Co(dipy) 3 ] 3+ results in a tubular superstructure, which is unlike the tubular structure of the assembly of p -sulfonatocalix[4]arene inclusion complexes, provided by the up−up arrangement of calixarene units. It is also interesting to note that, unlike the [Ni(dipy) 3 ] 2+ − p -sulfonatocalix[4]arene system 13 in which the presence of the equilibrium mixture of tetra- and penta-anions results in a crystal structure with both tetra- and penta-anions, the system of [Co(dipy) 3 ] 3+ and 1 has two different crystal structures which are dependent on the form of 1 ( 1 4 - and 1 5 - ).…”

Guest-Induced Molecular Capsule Assembly of p-Sulfonatothiacalix[4]arene

“…The capsule significantly keeps open, since one sulfonate group in each calixarene does not coordinate to a sodium center. Compared with the reported capsules compounds, [5][6][7][8]20 the capsule in 1 is quite compact, in which the distance between the top S1A‚‚‚S2A‚‚‚S3A‚‚‚S4A plane and bottom S1‚‚‚S2‚‚‚S3‚‚‚S4 plane defined by bridging sulfur of TCAS is about 13.27 Å (Figure 1). Na1 hinges four different calixarenes of two capsules through sulfonate linkages, resulting in an infinite 1D array of capsules (Figure 2).…”