Anion induced capsular self-assemblies

Abstract

Researchers world-wide have employed diverse strategies to achieve various anion binding hosts and anion induced supramolecular architectures due to the increasing appreciation of anion receptor chemistry. Intellectual discovery of molecular capsules for the recognition of different guest species has opened up a new field of research in the area of supramolecular chemistry. This feature article aims to provide an overview of the current status and recent achievements made by us and others in the last decade in the area of anion induced construction of supramolecular capsules and anion binding in molecular capsules.

Arene platform based hexa-amide receptors for anion recognition: single crystal X-ray structural and thermodynamic studies

“…Fig. Chloride recognition pattern in complex 1 follows the trend as in acetate complexes (3)(4)(5)(6)(7)(8) where L1 is in the chair like aaabbb conformation (Table 1S, Fig. Both the chloride complexes show 1 : 2 (host : guest) stoichiometry in solid state.…”

“…[1][2][3][4][5][6][7][8][9] Various neutral tripodal receptors and polyammonium macrocycles are reported in the literature which are capable of encapsulating or isolating numerous anions like sulfate, 10-14 arsenate, [15][16][17][18][19][20][21] uoride, 22-32 thiosulfate, 33 perrhenate 34,35 etc. [1][2][3][4][5][6][7][8][9] Various neutral tripodal receptors and polyammonium macrocycles are reported in the literature which are capable of encapsulating or isolating numerous anions like sulfate, 10-14 arsenate, [15][16][17][18][19][20][21] uoride, 22-32 thiosulfate, 33 perrhenate 34,35 etc.…”

“…Chloride is an integral part of chloride channels which is responsible for transport in human body. 51,52,57 Herein we report a series of neutral hexa-amide receptors that have shown structural diversities upon guest binding depending on basicity of the guests and substitutions on the receptor backbone. For example, carboxylates have specic biochemical behaviors and act as crucial components in metabolic pathways.…”

Self-Assembly of a Tris(Urea) Receptor as Tetrahedral Cage for the Encapsulation of a Discrete Tetrameric Mixed Phosphate Cluster (H2PO4–•HPO42–)2

“…2D-NOESY NMR (DMSO-d 6 ) experiments were carried out on the phosphate complexes (complexes 1 and 2) to study the binding discrepancies of phosphate anion with the neutral and charged host.…”

Acid/base controlled size modulation of capsular phosphates, hydroxide encapsulation, quantitative and clean extraction of sulfate with carbonate capsules of a tripodal urea receptor

“…[1][2][3][4] When two or more receptors with interior anion binding sites create an assembly; there is a possibility to satisfy the higher coordination numbers required for the binding of oxyanions [5][6][7] and hydrated anions. [8][9][10] Recognition of tetrahedral oxyanions like inorganic phosphates and sulfates are of considerable current interest due to their biological and environmental importance. [11][12][13][14] Phosphates are the most important ingredients for fertilizer as plants need phosphorus for growth, though phosphate is often regarded as the main culprit in cases of eutrophication in lakes and river water.…”