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Thiabaud G, Brugnara A, Carboni M, Le Poul N, Colasson B, Le Mest Y, Reinaud O. Synthesis and Studies of a Water-Soluble and Air-Stable CuI/CuII Open-Shell Funnel Complex. Org Lett 2012; 14:2500-3. [DOI: 10.1021/ol3007875] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Grégory Thiabaud
- Laboratoire de Chimie et Biochimie Pharmacologiques et Toxicologiques, CNRS UMR 8601, PRES Sorbonne Paris Cité, Université Paris Descartes, 45 rue des Saints Pères, 75006 Paris, France, and Laboratoire de Chimie, Electrochimie Moléculaires et Chimie Analytique, CNRS UMR 6521, Université Européenne de Bretagne à Brest, CS 93837, 6 avenue Le Gorgeu, 29238 Brest Cedex 3, France
| | - Andrea Brugnara
- Laboratoire de Chimie et Biochimie Pharmacologiques et Toxicologiques, CNRS UMR 8601, PRES Sorbonne Paris Cité, Université Paris Descartes, 45 rue des Saints Pères, 75006 Paris, France, and Laboratoire de Chimie, Electrochimie Moléculaires et Chimie Analytique, CNRS UMR 6521, Université Européenne de Bretagne à Brest, CS 93837, 6 avenue Le Gorgeu, 29238 Brest Cedex 3, France
| | - Michael Carboni
- Laboratoire de Chimie et Biochimie Pharmacologiques et Toxicologiques, CNRS UMR 8601, PRES Sorbonne Paris Cité, Université Paris Descartes, 45 rue des Saints Pères, 75006 Paris, France, and Laboratoire de Chimie, Electrochimie Moléculaires et Chimie Analytique, CNRS UMR 6521, Université Européenne de Bretagne à Brest, CS 93837, 6 avenue Le Gorgeu, 29238 Brest Cedex 3, France
| | - Nicolas Le Poul
- Laboratoire de Chimie et Biochimie Pharmacologiques et Toxicologiques, CNRS UMR 8601, PRES Sorbonne Paris Cité, Université Paris Descartes, 45 rue des Saints Pères, 75006 Paris, France, and Laboratoire de Chimie, Electrochimie Moléculaires et Chimie Analytique, CNRS UMR 6521, Université Européenne de Bretagne à Brest, CS 93837, 6 avenue Le Gorgeu, 29238 Brest Cedex 3, France
| | - Benoît Colasson
- Laboratoire de Chimie et Biochimie Pharmacologiques et Toxicologiques, CNRS UMR 8601, PRES Sorbonne Paris Cité, Université Paris Descartes, 45 rue des Saints Pères, 75006 Paris, France, and Laboratoire de Chimie, Electrochimie Moléculaires et Chimie Analytique, CNRS UMR 6521, Université Européenne de Bretagne à Brest, CS 93837, 6 avenue Le Gorgeu, 29238 Brest Cedex 3, France
| | - Yves Le Mest
- Laboratoire de Chimie et Biochimie Pharmacologiques et Toxicologiques, CNRS UMR 8601, PRES Sorbonne Paris Cité, Université Paris Descartes, 45 rue des Saints Pères, 75006 Paris, France, and Laboratoire de Chimie, Electrochimie Moléculaires et Chimie Analytique, CNRS UMR 6521, Université Européenne de Bretagne à Brest, CS 93837, 6 avenue Le Gorgeu, 29238 Brest Cedex 3, France
| | - Olivia Reinaud
- Laboratoire de Chimie et Biochimie Pharmacologiques et Toxicologiques, CNRS UMR 8601, PRES Sorbonne Paris Cité, Université Paris Descartes, 45 rue des Saints Pères, 75006 Paris, France, and Laboratoire de Chimie, Electrochimie Moléculaires et Chimie Analytique, CNRS UMR 6521, Université Européenne de Bretagne à Brest, CS 93837, 6 avenue Le Gorgeu, 29238 Brest Cedex 3, France
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Darbost U, Rager MN, Petit S, Jabin I, Reinaud O. Polarizing a Hydrophobic Cavity for the Efficient Binding of Organic Guests: The Case of Calix[6]tren, a Highly Efficient and Versatile Receptor for Neutral or Cationic Species. J Am Chem Soc 2005; 127:8517-25. [PMID: 15941287 DOI: 10.1021/ja051299u] [Citation(s) in RCA: 93] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The host-guest properties of calix[6]tren 1 have been evaluated. The receptor is based on a calix[6]arene that is covalently capped at the narrow rim by a tren unit. As a result, the system presents a concave hydrophobic cavity with, at its bottom, a grid-like nitrogenous core. Despite its well-defined cavity and opening to the outside at the large rim, 1 did not behave as a good receptor for neutral molecules in chloroform. However, it exhibited efficient endo-complexation of ammonium guests. By contrast, the per-protonated host, 1.4H(+), behaved as a remarkable receptor for small organic molecules. The complexation is driven by a strong charge-dipole interaction and hydrogen bonds between the polar guest and the tetracationic cap of the calixarene. Finally, coordination of Zn(2+) to the tren core led to the asymmetrization of calixarene cavity and to the strong but selective endo-binding of neutral ligands. This study emphasizes the efficiency of a receptor presenting a concave hydrophobic cavity that is polarized at its bottom. The resulting combination of charge-dipole, hydrogen bonding, CH-pi, and van der Waals interactions highly stabilizes the supramolecular architectures. Also, importantly, the tren cap allows the tuning of the polarization, offering either a basic (1), a highly charged and acidic (1.4H(+)), or a coordination (1.Zn(2+)) site. As a result, the system proved to be highly versatile, tunable, and interconvertible in solution by simple addition of protons, bases, or metal ions.
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Affiliation(s)
- Ulrich Darbost
- URCOM, Université du Havre, Faculté des Sciences et Techniques, 25 rue Philippe Lebon, BP 540, 76058 Le Havre Cedex, France
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O'Leary BM, Szabo T, Svenstrup N, Schalley CA, Lützen A, Schäfer M, Rebek J. "Flexiball" toolkit: a modular approach to self-assembling capsules. J Am Chem Soc 2001; 123:11519-33. [PMID: 11716705 DOI: 10.1021/ja011651d] [Citation(s) in RCA: 88] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We report the synthesis and characterization of new, self-assembling molecular capsules. The modular strategy makes use of glycoluril building blocks available in multigram amounts combined with aromatic spacer elements. The lengthy syntheses encountered with earlier generations of capsules are avoided, and several capsules of nanometer dimensions are now accessible. Single bond attachments between spacers and glycoluril modules result in monomers as dimeric capsules that are less rigid than their earlier counterparts. The host-guest properties of the homo- and heterodimeric capsules were studied using a combination of NMR and ESI-mass spectrometry. They show a less pronounced selectivity for guests of different sizes, and their increased flexibility prevents self-assembly when no rigidifying elements are present on the central spacer unit. Some of the new capsules bear inwardly directed, secondary amide N-H protons. These can be further functionalized, as shown by their methylation to give tertiary analogues. The structures hold broader implications for the placement of functional groups on concave molecular surfaces.
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Affiliation(s)
- B M O'Leary
- The Skaggs Institute for Chemical Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, USA
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