Concepts of Trapping Topologically by Shell Molecules

Abstract

Concepts of the synthesis of shell topological compounds, which consist of a guest molecule (or molecules) trapped by a host molecule with a spacial, egg shell-like structure are discussed. Generally, both constructing the shell molecule in the presence of a guest molecule and constructing the guest molecule In the presence of the shell (host) are ways to "shell" topological compounds. The preparation of shell molecules may consist of the completion of "preshell" molecules or of obtaining cascade branched oligomers and polymers. Cyclodextrins and aubstances like triquinance are considered to play a role in preshell molecules. Shell molecules may also be obtained by polyreaction of a monomer of the XRY type, which results In a cascade branched molecule of shell structure (spherical form). When the polyreaction is continued, the cascade branched molecule becomes a "cast" one. E is theoretically possible to enclose a guest molecule inside the shell during the cascade branching process if there is a good solvent (of high expansion coefficient value) iii respect to the growing branches, A spacially developed molecule of both "empty" and "cast" structure may be obtained also by the known "step by step" cascade branching process which Involves, for instance, a repeated cyanoethylation-reduction reaction.689

Crystal Engineering of Metalloporphyrin Zeolite Analogues

“…[5] To circumvent these potential difficulties we looked for an alternative metal, and iridium(iii) appeared to be particularly well suited. The [Ir(terpy) 2 ] 3 unit forms the central complex (A 1 ) of the present triad (Scheme 1), in which a free-base porphyrin (PH 2 ) is the primary electron donor (D), and a gold(iii) porphyrin (PAu) the secondary electron acceptor (A 2 ). In the natural photosynthetic reaction center, D, A 1 , and A 2 are P, B, and H, respectively.…”

“…This three-component natural device (triad) is extremely efficient and has triggered the synthesis and study of many triads, designed to function in a similar way. [2] Until now most of these systems relied on covalent bonds. Recently, alternative strategies were proposed for constructing multiporphyrin assemblies, mostly based on hydrogen bonds, [3a] mechanical bonds, [3b] or coordination bonds.…”

“…The absorption spectrum undergoes changes with increasing concentration of rose bengal and the ratio of the two absorption maxima (l 1 /l 2 ) decreases as a result of dye ± dye interactions. [2] based on well established principles of the supramolecular design in solids [3] provide an encouraging indication that development of stable porous molecular solids with structural and functional resemblance to the naturally occurring inorganic zeolites could be feasible. The ability to organize molecular building blocks into desired supramolecular architectures through cooperative noncovalent forces requires identification of effective synthons with suitable geometries and adequate enthalpic driving forces.…”

Structure‐Transport Relationship of Dendritic Core‐Shell Nanocarriers for Polar Dyes

“…[1][2][3] Several host-guest systems have been developed, for example, the ''dendritic box'', [4,5] crown ether dendrimers, [6] and cyclophane dendrimers. [7] A number of guest molecules, such as polar dyes and drugs, can be encapsulated in these dendrimers.…”

Dendrimers based on [1,3,5]‐triazines

“…Subsequent elaboration of the dendron by cycloaddition between the peripheral nitriles and nitrile-substituted guanidine derivatives increases the dendrimer generation. Maciejewski 17 wrote one of the earliest theoretical articles on the subject of dendrimers that could be prepared with this method in 1982. Moreover, cyanoethylation was the method used by Vögtle 18 in what is commonly described as the first dendrimer synthesis, although his dendrimer did not contain triazine derivatives.…”