Journal
ORGANIC CHEMISTRY FRONTIERS
Volume 9, Issue 16, Pages 4238-4249Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d2qo00423b
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Funding
- Associate Laboratory for Green Chemistry - LAQV [UIDB/50006/2020, UIDP/50006/2020]
- Research Unit on Applied Molecular Biosciences - UCIBIO [UIDP/04378/2020, UIDB/04378/2020]
- Associate Laboratory Institute for Health and Bioeconomy - i4HB - FCT/MCTES [LA/P/0140/2020]
- FCT/MCTES [ROTEIRO/0031/2013-PINFRA/22161/2016, PTDC/QUI-COL/32351/2017, PTDC/QUI-QFI/30951/2017, FCT-ANR/BBB-MET/0023/2012, PTDC/BIA-BQM/29442/2017, CEECIND/00466/2017, 2021.07205.BD]
- FEDER through COMPETE 2020
- POCI
- PORL
- FCT through PIDDAC
- European Commission [734834]
- BioISI [UIDB/04046/2020-UIDP/04046/2020]
- Spanish Ministry of Science and Innovation [PID2020-119992GB-I00]
- FCT [CEECIND/00381/2021]
- Fundação para a Ciência e a Tecnologia [FCT-ANR/BBB-MET/0023/2012, PTDC/BIA-BQM/29442/2017, 2021.07205.BD, PTDC/QUI-QFI/30951/2017] Funding Source: FCT
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The synthetic receptor cucurbit[8]uril (CB8) can form high-affinity host-guest complexes with dicationic dithienylethene (DTE) photoswitches in water. The formation of these complexes is driven by a combination of hydrophobic effects, ion-dipole, hydrogen- and chalcogen-bonding interactions. The binding affinities are much higher for the closed isomers of DTE, providing ideal conditions for the development of robust photoswitchable host-guest complexes.
The cucurbit[8]uril (CB8) synthetic receptor is shown to form high-affinity host-guest complexes with dicationic dithienylethene (DTE) photoswitches in water. ITC experiments combined with computational studies suggest that the formation of the inclusion complexes is mainly driven by a combination of hydrophobic effects, ion-dipole, hydrogen- and chalcogen-bonding interactions. The binding affinities were observed to be much higher for the DTE closed isomers, reaching values in the picomolar range (up to 10(11) M-1) while the open isomers display up to 10 000-fold lower affinities, setting ideal conditions for the development of robust photoswitchable host-guest complexes. The light-responsive affinity of these photoswitches toward CB8 was explored to control the encapsulation and release of nanomolar affinity steroids via competitive guest replacement.
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