guest complex
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2022 ◽  
Author(s):  
Hosoowi Lee ◽  
Jun Ho Hwang ◽  
Dajung Lee ◽  
Inhye Kim ◽  
Eunji Lee ◽  
...  

Abstract Reversible supramolecular polymerisation and depolymerisation of biomacromolecules are common and fundamental phenomena in biological systems, which can be controlled by the selective modification of biomacromolecules through molecular recognition. Herein, a porphyrin tripod (DPZnT) connected through a triazole bridge was prepared as a monomeric building block for guest-induced supramolecular polymerisation. Although the lone pair electrons in triazolic nitrogen potentially bind to the zinc porphyrin units through axial ligation, the intrinsic steric hindrance suppressed the coordination of the triazole bridge to the porphyrin unit in DPZnT. Therefore, DPZnT formed spherical nanoparticles through π-π interactions. The addition of 1,3,5-tris(pyridine-4-yl)benzene (Py3B) caused the guest-induced fibrous supramolecular polymerisation of DPZnT by forming a 1:1 host-guest complex, which was further assembled into a fibrous polymer. Furthermore, addition of Cl− to DPZnT induced the transformation of spherical nanoparticles to fibrous supramolecular polymers. The fibrous supramolecular polymers of DPZnT obtained by adding Py3B or Cl− were depolymerised to their original spherical particles after adding Cu(ClO4)2 or AgNO3, respectively.


2021 ◽  
Vol 8 (12) ◽  
Author(s):  
Jun Zheng ◽  
Lian An ◽  
Jie Gao ◽  
Lin Zhang ◽  
Xinan Yang ◽  
...  

This paper has selected dicyclohexanocucurbit[6]uril (CyH 2 Q[6]) as the host and 2-phenylbenzimidazole ( G ) as the guest to investigate the host–guest interaction mode between CyH 2 Q[6] and G . Under acidic conditions, the complex was characterized using nuclear magnetic resonance, ultraviolet and fluorescence spectroscopy. The results show that the molecular ratio of CyH 2 Q[6] to G is 2 : 1. The crystals were cultured with ZnCl 2 as a structural inducer under acidic conditions and single crystal X-ray diffraction showed that the molecular ratio of CyH 2 Q[6] to G is 1 : 3. The G@CyH 2 Q[6] was used as a fluorescent probe to identify metal cations. The probe exhibits a good selective recognition effect toward Fe 3+ ions, which involves a reduced fluorescence intensity with a limit of detection of 1.321 × 10 –6 mol l –1 .


2021 ◽  
Vol 340 ◽  
pp. 129916
Author(s):  
Wenjun Xu ◽  
Honghong Duan ◽  
Xingmao Chang ◽  
Gang Wang ◽  
Dingfang Hu ◽  
...  

2021 ◽  
pp. 971-977
Author(s):  
Akihide Sugawara ◽  
Taka-Aki Asoh ◽  
Yoshinori Takashima ◽  
Akira Harada ◽  
Hiroshi Uyama

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Hong Zhang ◽  
Felix Thomas Eickemeyer ◽  
Zhiwen Zhou ◽  
Marko Mladenović ◽  
Farzaneh Jahanbakhshi ◽  
...  

AbstractFormamidinium lead iodide perovskites are promising light-harvesting materials, yet stabilizing them under operating conditions without compromising optimal optoelectronic properties remains challenging. We report a multimodal host–guest complexation strategy to overcome this challenge using a crown ether, dibenzo-21-crown-7, which acts as a vehicle that assembles at the interface and delivers Cs+ ions into the interior while modulating the material. This provides a local gradient of doping at the nanoscale that assists in photoinduced charge separation while passivating surface and bulk defects, stabilizing the perovskite phase through a synergistic effect of the host, guest, and host–guest complex. The resulting solar cells show power conversion efficiencies exceeding 24% and enhanced operational stability, maintaining over 95% of their performance without encapsulation for 500 h under continuous operation. Moreover, the host contributes to binding lead ions, reducing their environmental impact. This supramolecular strategy illustrates the broad implications of host–guest chemistry in photovoltaics.


2021 ◽  
Vol MA2021-01 (63) ◽  
pp. 1665-1665
Author(s):  
Salla Välimäki ◽  
Ngong Kodiah Beyeh ◽  
Veikko Linko ◽  
Robin Ras ◽  
Mauri Kostiainen

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