Self-assembly in self-organized inorganic systems: a view of programmed metallosupramolecular architectures

Abstract

Os avanços recentes das pesquisas na área de sistemas inorgânicos automontados são resumidos neste artigo de revisão, em especial aqueles envolvendo os metalo-helicatos, os metaloexorreceptores e as arquiteturas inorgânicas formadas a partir de componentes múltiplos. As aplicações, assim como as perspectivas vislumbradas para estes sistemas, são também discutidas.This review summarizes the recent advances that have been performed on self-assembled inorganic systems, especially on helical systems, metallo-exoreceptors and on architectures formed from multiple components. In addition, applications as well as the perspectives for these designed systems are also discussed.

Quimiossensores cromogênicos e fluorogênicos para a detecção de analitos aniônicos

“…Assim, os diferentes quimiossensores cromogênicos e fluorogênicos fazem uso do enorme repertório de receptores disponíveis na literatura, 1-4,9-21,28,29,38,133 além de novos sistemas especialmente planejados, em combinação com indicadores de pH clássicos, compostos solvatocrômicos e solvatofluorocrômicos e com novas unidades sinalizadoras cromóforas e fluoróforas. Quimiossensores baseados em tris-tiouréias pseudocí-clicas têm sido estudados, 134 os quais ilustram a enorme importância da automontagem e da auto-organização 15,135,136 no planejamento de novas estratégias de detecção de analitos. Merece ser observado que a química metalossupramolecular 29,38,136,137 tem inspirado uma vasta quantidade de sistemas com potencial para o reconhecimento e detecção de ânions.…”

Inorganic self-assembly through sequential complexation in the formation of bimetallic and trimetallic architectures from multisite ligands based on 5,5'-disubstituted 2,2'-bipyridines

“…[1][2][3][4][5][6] Such processes involve the design of programmed supramolecular species, which are spontaneously formed from carefully constructed ligands and metal ions able to read the binding sites according to their coordination algorithm. 1,2,6 This strategy has allowed the synthesis of a great variety of inorganic architectures, 1-6 such as double-7 and triple-helical 8 complexes, rack-, 9 grid-10 and cagetype 11 arrays of metal ions synthesized by our own group.…”

“…[1][2][3][4][5][6] Such processes involve the design of programmed supramolecular species, which are spontaneously formed from carefully constructed ligands and metal ions able to read the binding sites according to their coordination algorithm. 1,2,6 This strategy has allowed the synthesis of a great variety of inorganic architectures, [1][2][3][4][5][6] such as double- 7 and triple-helical 8 complexes, rack-, 9 grid-10 and cagetype 11 arrays of metal ions synthesized by our own group. The design of ligands containing different coordination sites has spontaneously yielded structures having different metal ions at specific locations, as in heterometallic helicates 12 and in large multicomponent arrays.…”

“…13 Exoreceptors are receptor molecules where the substrate fixation sites are divergent, in opposition to the convergent chemistry of the endoreceptors. 1,6,14,15 The different kinds of exoreceptors include organic as well as J. Braz. Chem.…”

“…6 Thus, the octahedral coordination of 5,5'-disubstituted 2,2'-bipyridines by a metal ion such as Fe 2+ will enable the substituents to acquire a proper spatial orientation, leading to the formation of a ditopic metallo-exoreceptor presenting two potential substrate binding subunits. These receptors may be of importance in many areas of supramolecular chemistry, such as enzyme modelling, anionic recognition and in the development of molecular devices.…”