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Milone M, Pisagatti I, Gattuso G, Notti A, Parisi MF, Brancatelli G, Hickey N, Geremia S. Influence of H-bond competitors on the solvent-dependent structures of an octaurea-calix[4]tube. RSC Adv 2024; 14:4448-4455. [PMID: 38312720 PMCID: PMC10835760 DOI: 10.1039/d3ra08764f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2023] [Accepted: 01/19/2024] [Indexed: 02/06/2024] Open
Abstract
A novel octaurea-calix[4]tube (UC4T) has been synthesized in three steps from the original Beer's p-tert-butylcalix[4]tube ionophore. In a polar solvent (DMSO-d6), UC4T rapidly interconverts between two identical conformations with C2v symmetry for the two calix[4]arene subunits. However, in a less polar solvent mixture (CDCl3/DMSO-d6, 98 : 2), UC4T adopts a highly distorted asymmetric structure, which hinders the formation of typical tetraurea calix[4]arene capsular assemblies. The complexation of potassium (or barium) cations inside the dioxyethylene ionophoric binding site of UC4T triggers a C2v to C4v symmetry rearrangement of the two calix[4]arene subunits. This rearrangement leads to the formation of a transient capsular dimeric species observed in solution upon the addition of KI or BaCl2·2H2O to a solution (CDCl3/DMSO-d6, 98 : 2) of the macrocycle. X-ray studies confirm UC4T's ability to adopt different asymmetric conformations, depending on its interactions with solvent molecules. Two distinct crystal forms (α and β) of UC4T have been obtained, each displaying divergent calix[4]arene subunits with pinched-cone conformations. These conformations exhibit distinctive head-to-tail (α) or head-to-head/tail-to-tail (β) orientations of the ureido groups, which are involved in hydrogen bonding with solvent molecules. Notably, the pseudo-capsular 1D supramolecular polymeric arrays observed in the β form of UC4T assemble to create large parallel solvent channels.
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Affiliation(s)
- Marco Milone
- Dipartimento di Scienze Chimiche, Biologiche, Farmaceutiche ed Ambientali, Università degli Studi di Messina Viale F. Stagno d'Alcontres 31 Messina 98166 Italy
| | - Ilenia Pisagatti
- Dipartimento di Scienze Chimiche, Biologiche, Farmaceutiche ed Ambientali, Università degli Studi di Messina Viale F. Stagno d'Alcontres 31 Messina 98166 Italy
| | - Giuseppe Gattuso
- Dipartimento di Scienze Chimiche, Biologiche, Farmaceutiche ed Ambientali, Università degli Studi di Messina Viale F. Stagno d'Alcontres 31 Messina 98166 Italy
| | - Anna Notti
- Dipartimento di Scienze Chimiche, Biologiche, Farmaceutiche ed Ambientali, Università degli Studi di Messina Viale F. Stagno d'Alcontres 31 Messina 98166 Italy
| | - Melchiorre F Parisi
- Dipartimento di Scienze Chimiche, Biologiche, Farmaceutiche ed Ambientali, Università degli Studi di Messina Viale F. Stagno d'Alcontres 31 Messina 98166 Italy
| | - Giovanna Brancatelli
- Centro di Eccellenza in Biocristallografia, Dipartimento di Scienze Chimiche e Farmaceutiche, Università di Trieste Via L. Giorgieri 1 Trieste I-34127 Italy
| | - Neal Hickey
- Centro di Eccellenza in Biocristallografia, Dipartimento di Scienze Chimiche e Farmaceutiche, Università di Trieste Via L. Giorgieri 1 Trieste I-34127 Italy
| | - Silvano Geremia
- Centro di Eccellenza in Biocristallografia, Dipartimento di Scienze Chimiche e Farmaceutiche, Università di Trieste Via L. Giorgieri 1 Trieste I-34127 Italy
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Gattuso G, Crisafulli D, Milone M, Mancuso F, Pisagatti I, Notti A, Parisi MF. Proton Transfer Mediated Recognition of Amines by Ionizable Macrocyclic Receptors. Chem Commun (Camb) 2022; 58:10743-10756. [DOI: 10.1039/d2cc04047f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Ammonium ion/carboxylate ion pairing is a key interaction ubiquitous in biological systems, but amine recognition by ionizable molecular receptors, mediated by host-to-guest proton transfer, has too often been overlooked as...
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Cohen Y, Slovak S, Avram L. Solution NMR of synthetic cavity containing supramolecular systems: what have we learned on and from? Chem Commun (Camb) 2021; 57:8856-8884. [PMID: 34486595 DOI: 10.1039/d1cc02906a] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
NMR has been instrumental in studies of both the structure and dynamics of molecular systems for decades, so it is not surprising that NMR has played a pivotal role in the study of host-guest complexes and supramolecular systems. In this mini-review, selected examples will be used to demonstrate the added value of using (multiparametric) NMR for studying macrocycle-based host-guest and supramolecular systems. We will restrict the discussion to synthetic host systems having a cavity that can engulf their guests thus restricting them into confined spaces. So discussion of selected examples of cavitands, cages, capsules and their complexes, aggregates and polymers as well as organic cages and porous liquids and other porous materials will be used to demonstrate the insights that have been gathered from the extracted NMR parameters when studying such systems emphasizing the information obtained from somewhat less routine NMR methods such as diffusion NMR, diffusion ordered spectroscopy (DOSY) and chemical exchange saturation transfer (CEST) and their variants. These selected examples demonstrate the impact that the results and findings from these NMR studies have had on our understanding of such systems and on the developments in various research fields.
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Affiliation(s)
- Yoram Cohen
- School of Chemistry, The Sackler Faculty of Exact Sciences, Tel Aviv University, Ramat Aviv, 699781, Tel Aviv, Israel.
| | - Sarit Slovak
- School of Chemistry, The Sackler Faculty of Exact Sciences, Tel Aviv University, Ramat Aviv, 699781, Tel Aviv, Israel.
| | - Liat Avram
- Faculty of Chemistry, Weizmann Institute of Science, Rehovot 7610001, Israel
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Notti A, Pisagatti I, Nastasi F, Patanè S, Parisi MF, Gattuso G. Stimuli-Responsive Internally Ion-Paired Supramolecular Polymer Based on a Bis-pillar[5]arene Dicarboxylic Acid Monomer. J Org Chem 2020; 86:1676-1684. [PMID: 33369427 PMCID: PMC7871325 DOI: 10.1021/acs.joc.0c02501] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
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A novel
bis-pillar[5]arene dicarboxylic acid self-assembles in
the presence of 1,12-diaminododecane to yield overall neutral, internally
ion-paired supramolecular polymers. Their aggregation, binding mode,
and morphology can be tuned by external stimuli such as solvent polarity,
concentration, and base treatment.
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Affiliation(s)
- Anna Notti
- Dipartimento di Scienze Chimiche, Biologiche, Farmaceutiche ed Ambientali, Università di Messina, Viale F. Stagno d'Alcontres 31, 98166 Messina, Italy
| | - Ilenia Pisagatti
- Dipartimento di Scienze Chimiche, Biologiche, Farmaceutiche ed Ambientali, Università di Messina, Viale F. Stagno d'Alcontres 31, 98166 Messina, Italy
| | - Francesco Nastasi
- Dipartimento di Scienze Chimiche, Biologiche, Farmaceutiche ed Ambientali, Università di Messina, Viale F. Stagno d'Alcontres 31, 98166 Messina, Italy
| | - Salvatore Patanè
- Dipartimento di Scienze Matematiche e Informatiche, Scienze Fisiche e Scienze della Terra, Università di Messina, Viale F. Stagno d'Alcontres 31, 98166 Messina, Italy
| | - Melchiorre F Parisi
- Dipartimento di Scienze Chimiche, Biologiche, Farmaceutiche ed Ambientali, Università di Messina, Viale F. Stagno d'Alcontres 31, 98166 Messina, Italy
| | - Giuseppe Gattuso
- Dipartimento di Scienze Chimiche, Biologiche, Farmaceutiche ed Ambientali, Università di Messina, Viale F. Stagno d'Alcontres 31, 98166 Messina, Italy
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Cohen Y, Slovak S. Diffusion NMR for the characterization, in solution, of supramolecular systems based on calixarenes, resorcinarenes, and other macrocyclic arenes. Org Chem Front 2019. [DOI: 10.1039/c9qo00329k] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
The use of diffusion NMR in studying calixarenes and other arene-based supramolecular systems is described, emphasizing the pivotal role played by the calixarene community in transforming the methods into a routine tool used in supramolecular chemistry.
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Affiliation(s)
- Yoram Cohen
- School of Chemistry
- The Sackler Faculty of Exact Sciences
- Tel Aviv University
- Tel Aviv
- Israel
| | - Sarit Slovak
- School of Chemistry
- The Sackler Faculty of Exact Sciences
- Tel Aviv University
- Tel Aviv
- Israel
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Pisagatti I, Barbera L, Gattuso G, Villari V, Micali N, Fazio E, Neri F, Parisi MF, Notti A. Tuning the aggregation of an amphiphilic anionic calix[5]arene by selective host–guest interactions with bola-type dications. NEW J CHEM 2019. [DOI: 10.1039/c9nj01198f] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Bola-type dications of different length drive the formation of head-to-tail or capsular supramolecular amphiphiles and, in turn, that of the final aggregates.
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Affiliation(s)
- Ilenia Pisagatti
- Dipartimento di Scienze Chimiche, Biologiche
- Farmaceutiche ed Ambientali
- Università di Messina
- 98166 Messina
- Italy
| | - Lucia Barbera
- Dipartimento di Scienze Chimiche, Biologiche
- Farmaceutiche ed Ambientali
- Università di Messina
- 98166 Messina
- Italy
| | - Giuseppe Gattuso
- Dipartimento di Scienze Chimiche, Biologiche
- Farmaceutiche ed Ambientali
- Università di Messina
- 98166 Messina
- Italy
| | | | - Norberto Micali
- CNR-IPCF Istituto per i Processi Chimico-Fisici
- 98158 Messina
- Italy
| | - Enza Fazio
- Dipartimento di Scienze Matematiche e Informatiche
- Scienze Fisiche e Scienze della Terra (MIFT)
- Università di Messina
- 98166 Messina
- Italy
| | - Fortunato Neri
- Dipartimento di Scienze Matematiche e Informatiche
- Scienze Fisiche e Scienze della Terra (MIFT)
- Università di Messina
- 98166 Messina
- Italy
| | - Melchiorre F. Parisi
- Dipartimento di Scienze Chimiche, Biologiche
- Farmaceutiche ed Ambientali
- Università di Messina
- 98166 Messina
- Italy
| | - Anna Notti
- Dipartimento di Scienze Chimiche, Biologiche
- Farmaceutiche ed Ambientali
- Università di Messina
- 98166 Messina
- Italy
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Manganaro N, Pisagatti I, Notti A, Parisi MF, Gattuso G. Self-sorting assembly of a calixarene/crown ether polypseudorotaxane gated by ion-pairing. NEW J CHEM 2019. [DOI: 10.1039/c9nj01583c] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
A polypseudorotaxane composed of a calix[5]arene-diammonium supramolecular polymer and dibenzo-24-crown-8 wheels self-assembles only in the presence of superweak counterions
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Affiliation(s)
- Nadia Manganaro
- Dipartimento di Scienze Chimiche
- Biologiche
- Farmaceutiche ed Ambientali
- Università di Messina
- 98166 Messina
| | - Ilenia Pisagatti
- Dipartimento di Scienze Chimiche
- Biologiche
- Farmaceutiche ed Ambientali
- Università di Messina
- 98166 Messina
| | - Anna Notti
- Dipartimento di Scienze Chimiche
- Biologiche
- Farmaceutiche ed Ambientali
- Università di Messina
- 98166 Messina
| | - Melchiorre F. Parisi
- Dipartimento di Scienze Chimiche
- Biologiche
- Farmaceutiche ed Ambientali
- Università di Messina
- 98166 Messina
| | - Giuseppe Gattuso
- Dipartimento di Scienze Chimiche
- Biologiche
- Farmaceutiche ed Ambientali
- Università di Messina
- 98166 Messina
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