An Operative Electrostatic Slipping Mechanism along Macrocycle Flexibility Accelerates Guest Sliding during pseudo‐Rotaxane Formation
Abstract A pseudo‐rotaxane is a host−guest complex composed of a linear molecule encircled by a macrocyclic ring. These complexes can be assembled by sliding the host over the guest terminal groups. If there is a close match between the molecular volume of the flanking groups on the guest and the ca...
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| Format: | Article |
| Language: | English |
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Wiley-VCH
2022-06-01
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| Series: | ChemistryOpen |
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| Online Access: | https://doi.org/10.1002/open.202200112 |
| _version_ | 1818545507542237184 |
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| author | Dr. Aldo C. Catalán Axel A. Loredo Dr. Ruy Cervantes Prof. Dr. Jorge Tiburcio |
| author_facet | Dr. Aldo C. Catalán Axel A. Loredo Dr. Ruy Cervantes Prof. Dr. Jorge Tiburcio |
| author_sort | Dr. Aldo C. Catalán |
| collection | DOAJ |
| description | Abstract A pseudo‐rotaxane is a host−guest complex composed of a linear molecule encircled by a macrocyclic ring. These complexes can be assembled by sliding the host over the guest terminal groups. If there is a close match between the molecular volume of the flanking groups on the guest and the cavity size of the macrocycle, the slipping might occur slowly or even become completely hindered. We have previously shown that it is possible to overcome the restraints imposed by steric effects on the sliding process by integrating electrostatic attractive interactions during the slipping step. In this work, we extend our electrostatically assisted slipping approach (EASA) to a new host−guest system featuring a flexible macrocyclic ring and a series of asymmetric guests containing a cyclic tertiary ammonium group. Compelling evidence for pseudo‐rotaxane formation is presented, along with thermodynamic and kinetic data. Experimental results suggests that the higher conformational flexibility of 24‐crown‐8 significantly increases the sliding rate, compared with the more rigid dibenzo‐24‐crown‐8, without affecting complex stability. Furthermore, by combining the EASA and macrocycle flexibility, we were capable to slip a large eight‐membered cyclic group across the 24‐crown‐8 annulus, setting a new limit on the ring molecular size that can pass through a 24‐membered crown ether. |
| first_indexed | 2024-12-12T07:41:04Z |
| format | Article |
| id | doaj.art-25ac036d05164f6893b2485fdf41eaa1 |
| institution | Directory Open Access Journal |
| issn | 2191-1363 |
| language | English |
| last_indexed | 2024-12-12T07:41:04Z |
| publishDate | 2022-06-01 |
| publisher | Wiley-VCH |
| record_format | Article |
| series | ChemistryOpen |
| spelling | doaj.art-25ac036d05164f6893b2485fdf41eaa12022-12-22T00:32:47ZengWiley-VCHChemistryOpen2191-13632022-06-01116n/an/a10.1002/open.202200112An Operative Electrostatic Slipping Mechanism along Macrocycle Flexibility Accelerates Guest Sliding during pseudo‐Rotaxane FormationDr. Aldo C. Catalán0Axel A. Loredo1Dr. Ruy Cervantes2Prof. Dr. Jorge Tiburcio3Department of Chemistry Center for Research and Advanced Studies (Cinvestav) Avenida IPN 2508 07360 Mexico City MexicoDepartment of Chemistry Center for Research and Advanced Studies (Cinvestav) Avenida IPN 2508 07360 Mexico City MexicoDepartment of Chemistry Center for Research and Advanced Studies (Cinvestav) Avenida IPN 2508 07360 Mexico City MexicoDepartment of Chemistry Center for Research and Advanced Studies (Cinvestav) Avenida IPN 2508 07360 Mexico City MexicoAbstract A pseudo‐rotaxane is a host−guest complex composed of a linear molecule encircled by a macrocyclic ring. These complexes can be assembled by sliding the host over the guest terminal groups. If there is a close match between the molecular volume of the flanking groups on the guest and the cavity size of the macrocycle, the slipping might occur slowly or even become completely hindered. We have previously shown that it is possible to overcome the restraints imposed by steric effects on the sliding process by integrating electrostatic attractive interactions during the slipping step. In this work, we extend our electrostatically assisted slipping approach (EASA) to a new host−guest system featuring a flexible macrocyclic ring and a series of asymmetric guests containing a cyclic tertiary ammonium group. Compelling evidence for pseudo‐rotaxane formation is presented, along with thermodynamic and kinetic data. Experimental results suggests that the higher conformational flexibility of 24‐crown‐8 significantly increases the sliding rate, compared with the more rigid dibenzo‐24‐crown‐8, without affecting complex stability. Furthermore, by combining the EASA and macrocycle flexibility, we were capable to slip a large eight‐membered cyclic group across the 24‐crown‐8 annulus, setting a new limit on the ring molecular size that can pass through a 24‐membered crown ether.https://doi.org/10.1002/open.202200112supramolecular chemistryhost−guest systemskineticsself-assemblymolecular recognition |
| spellingShingle | Dr. Aldo C. Catalán Axel A. Loredo Dr. Ruy Cervantes Prof. Dr. Jorge Tiburcio An Operative Electrostatic Slipping Mechanism along Macrocycle Flexibility Accelerates Guest Sliding during pseudo‐Rotaxane Formation ChemistryOpen supramolecular chemistry host−guest systems kinetics self-assembly molecular recognition |
| title | An Operative Electrostatic Slipping Mechanism along Macrocycle Flexibility Accelerates Guest Sliding during pseudo‐Rotaxane Formation |
| title_full | An Operative Electrostatic Slipping Mechanism along Macrocycle Flexibility Accelerates Guest Sliding during pseudo‐Rotaxane Formation |
| title_fullStr | An Operative Electrostatic Slipping Mechanism along Macrocycle Flexibility Accelerates Guest Sliding during pseudo‐Rotaxane Formation |
| title_full_unstemmed | An Operative Electrostatic Slipping Mechanism along Macrocycle Flexibility Accelerates Guest Sliding during pseudo‐Rotaxane Formation |
| title_short | An Operative Electrostatic Slipping Mechanism along Macrocycle Flexibility Accelerates Guest Sliding during pseudo‐Rotaxane Formation |
| title_sort | operative electrostatic slipping mechanism along macrocycle flexibility accelerates guest sliding during pseudo rotaxane formation |
| topic | supramolecular chemistry host−guest systems kinetics self-assembly molecular recognition |
| url | https://doi.org/10.1002/open.202200112 |
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