PH‐Responsive Pillar[6]arene‐based Water‐Soluble Supramolecular Hexagonal Boxes. (14th March 2019)

• Record Type: Journal Article
• Authors: Kaizerman‐Kane, Dana; Hadar, Maya; Tal, Noam; Dobrovetsky, Roman; Zafrani, Yossi; Cohen, Yoram
• Is Part Of: Angewandte Chemie. Volume 131:Number 16(2019)
• Page Start: 5356
• Page End: 5360
• Publication Date: 2019-03-14
• Subjects: Mellitsäure -- Molekulare Boxen -- Multivalenz -- Pillar[6]arene -- Supramolekulare Chemie; Chemistry -- Periodicals; 540
• DOI: 10.1002/ange.201900217
• Languages: English
• ISSNs: 0044-8249

Abstract

Abstract: We describe the preparation of the first water‐soluble pH‐responsive supramolecular hexagonal boxes (SHBs) based on multiple charge‐assisted hydrogen bonds between peramino‐pillar[6]arenes2 with the molecular "lid" mellitic acid (1 a ). The interaction between2 and1 a, as well as the other "lids" pyromellitic and trimesic acids (1 b and1 c, respecively) were studied by a combination of experimental and computational methods. Interestingly, the addition of1 a to the complexes of the protonated form of pillar[6]arene2, that is, 3, with bis‐sulfonate4 a or4 b, immediately led to guest escape along with the formation of closed1 a2 2 supramolecular boxes. Moreover, the process of the openning and closing of the supramolecular boxes along with threading and escaping of the guests, respectively, was found to be reversible and pH‐responsive. This study paves the way for the easy and modular preparation of different SHBs that may have myriad applications.