《Wholly Visible-Light-Responsive Host-Guest Supramolecular Gels Based on Methoxy Azobenzene and β-Cyclodextrin Dimers》 was written by Yan, Hongchao; Qiu, Yuan; Wang, Jing; Jiang, Qian; Wang, Hong; Liao, Yonggui; Xie, Xiaolin. Formula: C6H12Br2 And the article was included in Langmuir in 2020. The article conveys some information:
Much attention has been paid to construct photoresponsive host-guest supramol. gels; however, red-shifting the responsive wavelength remains a formidable challenge. Here, a wholly visible-light-responsive supramol. gel was fabricated through the host-guest interaction between a β-cyclodextrin (β-CD) dimer and a tetra-ortho-methoxy-substituted azobenzene (mAzo) dimer (binary gelator) in DMSO/H2O (V/V = 8/2). The min. gelation concentration of the low-mol.-weight binary gelator was 6 wt % measured via the tube inversion method. The substituted methoxy groups shifted the responsive wavelengths of trans-mAzo and cis-mAzo to the green and blue light regions, resp. The host-guest interaction between mAzo and β-CD as the driving force for gelation was confirmed using the 1H-NMR and 2D 1H NOESY spectra. The supramol. gel showed good self-supporting ability with a storage modulus higher than 104 Pa. The release of Rhodamine B loaded in the gel as a model drug could be controlled by green light irradiation We envisioned the potential applications of the wholly visible-light-responsive supramol. compounds ranging from biomedical materials to smart materials. In the experimental materials used by the author, we found 1,6-Dibromohexane(cas: 629-03-8Formula: C6H12Br2)
1,6-Dibromohexane(cas: 629-03-8) is generally used to introduce C6 spacer in the molecular architecture. Some of the examples are: synthesis of pyrrolo-tetrathiafulvalene molecular bridge (6PTTF6) to study redox switching behavior of single molecules; synthesis of water-soluble thermoresponsive polylactides.Formula: C6H12Br2
Referemce:
Bromide – Wikipedia,
bromide – Wiktionary