Binaphthyl-Based Macrocycles as Optical Sensors for Aromatic Diphenols

Molecules

Andrea Nitti¹  Aurora Pacini¹  Dario Pasini¹  Marco Caricato¹  Stefano Piacentini¹ 

[1] Department of Chemistry and INSTM Research Unit, University of Pavia, Via Taramelli 12, 27100 Pavia, Italy;

关键词: chirality;    macrocycles;    binaphthyl;    circular dichroism;    chiroptical sensors;   

DOI  :  10.3390/molecules25030514

来源: DOAJ

【 摘 要 】

The synthesis of several rigid, homochiral organic macrocycles possessing, respectively, average molecular D₂ and D₃ symmetries, is described. They have been obtained from aromatic dicarboxylic acids, in combination with an axially-chiral, suitable dibenzylic alcohol, derived from 1,1′-binaphthyl-2,2′-diol (BINOL) using one-pot esterification reactions in good isolated yields. NMR and circular dichroism (CD) spectroscopies detect the structural and shape variability in the scaffolds, reflected both in terms of the changes in chemical shifts and the shape of selected proton resonances, and in terms of the variation of the CD signature related to the dihedral angle defined by the binaphthyl units embedded in the rigid cyclic skeleton. The D₂ cyclic adducts are able to form stable complexes with aromatic diphenols, with binding strengths that are dependent on small variations in the spacing units, and therefore on the shapes of the internal cavities of the cyclic structures.

【 授权许可】

Unknown