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Shokurov AV, Nikolayeva LV, Novak DN, Arslanov VV, Selektor SL. Nonradiative energy transfer in planar systems based on structurally different fluorophores. MENDELEEV COMMUNICATIONS 2017. [DOI: 10.1016/j.mencom.2017.07.015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Doistau B, Cantin JL, Chamoreau LM, Marvaud V, Hasenknopf B, Vives G. Mechanical switching of magnetic interaction by tweezers-type complex. Chem Commun (Camb) 2015; 51:12916-9. [DOI: 10.1039/c5cc04980f] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
An original approach using a mechanical motion to control the magnetic interaction between the two spin centers of terpy(Cu–salphen)2 complexes is presented.
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Affiliation(s)
- Benjamin Doistau
- Sorbonne Universités
- UPMC Univ Paris 06
- UMR 8232
- Institut Parisien de Chimie Moléculaire
- France
| | | | - Lise-Marie Chamoreau
- Sorbonne Universités
- UPMC Univ Paris 06
- UMR 8232
- Institut Parisien de Chimie Moléculaire
- France
| | - Valérie Marvaud
- Sorbonne Universités
- UPMC Univ Paris 06
- UMR 8232
- Institut Parisien de Chimie Moléculaire
- France
| | - Bernold Hasenknopf
- Sorbonne Universités
- UPMC Univ Paris 06
- UMR 8232
- Institut Parisien de Chimie Moléculaire
- France
| | - Guillaume Vives
- Sorbonne Universités
- UPMC Univ Paris 06
- UMR 8232
- Institut Parisien de Chimie Moléculaire
- France
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Mohammed AAK, Burger SK, Ayers PW. Drug release by pH-responsive molecular tweezers: atomistic details from molecular modeling. J Comput Chem 2014; 35:1545-51. [PMID: 24962869 DOI: 10.1002/jcc.23652] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2013] [Revised: 05/01/2014] [Accepted: 05/19/2014] [Indexed: 12/19/2022]
Abstract
pH-responsive molecular tweezers have been proposed as an approach for targeting drug-delivery to tumors, which tend to have a lower pH than normal cells. We performed a computational study of a pH-responsive molecular tweezer using ab initio quantum chemistry in the gas-phase and molecular dynamics (MD) simulations in solution. The binding free energy in solution was calculated using steered MD. We observe, in atomistic detail, the pH-induced conformational switch of the tweezer and the resulting release of the drug molecule. Even when the tweezer opens, the drug molecule remains near a hydrophobic arm of the molecular tweezer. Drug release cannot occur, it seems, unless the tweezer is in a hydrophobic environment with low pH.
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Affiliation(s)
- Ahmed A K Mohammed
- Department of Chemistry and Chemical Biology, McMaster University, Hamilton, Ontario, Canada, L8S 4M1
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Tsuchido Y, Suzaki Y, Ide T, Osakada K. Dynamic properties of molecular tweezers with a bis(2-hydroxyphenyl)pyrimidine backbone. Chemistry 2014; 20:4762-71. [PMID: 24604771 DOI: 10.1002/chem.201304380] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2013] [Indexed: 11/11/2022]
Abstract
4,6-Bis(2-hydroxyphenyl)-2-alkylpyrimidines with two anthryl or 9-ethylnylanthryl substituents at the positions para to the OH groups prefer a U-shaped conformation supported by two intramolecular OH⋅⋅⋅N hydrogen bonds in the solid state and in CDCl3 solution. The compound with a hexyl substituent on the pyrimidine group and two 9-ethynylanthryl arms at the hydroxyphenyl groups forms a 1:1 complex with 2,4,7-trinitrofluorenone. Its association constant K(a) was estimated to be 2100 M(-1) at 298 K, which is larger than those of other molecular tweezers (K(a) < 1000 M(-1)). DFT calculations suggested that the complex adopts a stable conformation supported by intramolecular hydrogen bonds among the OH groups and the pyrimidine ring as well as by intermolecular π-π interaction between the anthryl groups and 2,4,7-trinitrofluorenone. Addition of nBu4NF to a solution of the molecular tweezers or their complexes causes the cleavage of one or two OH⋅⋅⋅N hydrogen bonds, formation of new O⋅⋅⋅HF hydrogen bonds, and changes in the molecular conformation. The resulting structure of the molecular tweezers contains nonparallel anthryl groups, which do not bind the guest molecule. Photochemical measurements on 4,6-bis(2-hydroxyphenyl)-2-methylpyrimidine with two anthryl substituents showed negligible luminescence (quantum yield ϕ<0.01), owing to photoinduced electron transfer of the molecule with a U-shaped structure. However, the O-hexylated compound exhibits emission from the anthryl groups with ϕ=0.39.
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Affiliation(s)
- Yoshitaka Tsuchido
- Chemical Resources Laboratory, Tokyo Institute of Technology, 4259 R2-3, Nagastuta, Midori-ku, Yokohama 226-8503 (Japan), Fax: (+81) 45-924-5224
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Abstract
Molecular tweezers are dynamic devices that are able to switch from one conformation to another upon stimulation by an external trigger. In this work, we report a new water-soluble macromolecular carrier bearing a pH-responsive molecular tweezer, whose affinity for a substrate depends on the external pH. The conformational change of the switching unit was evidenced by (1)H NMR spectroscopy, and fluorescence studies conducted in aqueous media demonstrated the ability of the carrier to bind to substrates in a pH-dependent fashion.
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Abdallah D, Whelan J, Dust JM, Hoz S, Buncel E. Energy Transfer in the Azobenzene−Naphthalene Light Harvesting System. J Phys Chem A 2009; 113:6640-7. [DOI: 10.1021/jp901596t] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Dalia Abdallah
- Department of Chemistry, Queen’s University, Kingston, ON, K7L 3N6 Canada, Department of Chemistry and Chemical Engineering, Royal Military College of Canada, Kingston, ON, K7K 7B4 Canada, Departments of Chemistry and Environmental Science, Sir Wilfred Grenfell College (SWGC), Memorial University of Newfoundland, Corner Brook, Newfoundland and Labrador, A2H 6P9 Canada, and Department of Chemistry, Bar Ilan University, Ramat-Gan, Israel
| | - Jamie Whelan
- Department of Chemistry, Queen’s University, Kingston, ON, K7L 3N6 Canada, Department of Chemistry and Chemical Engineering, Royal Military College of Canada, Kingston, ON, K7K 7B4 Canada, Departments of Chemistry and Environmental Science, Sir Wilfred Grenfell College (SWGC), Memorial University of Newfoundland, Corner Brook, Newfoundland and Labrador, A2H 6P9 Canada, and Department of Chemistry, Bar Ilan University, Ramat-Gan, Israel
| | - Julian M. Dust
- Department of Chemistry, Queen’s University, Kingston, ON, K7L 3N6 Canada, Department of Chemistry and Chemical Engineering, Royal Military College of Canada, Kingston, ON, K7K 7B4 Canada, Departments of Chemistry and Environmental Science, Sir Wilfred Grenfell College (SWGC), Memorial University of Newfoundland, Corner Brook, Newfoundland and Labrador, A2H 6P9 Canada, and Department of Chemistry, Bar Ilan University, Ramat-Gan, Israel
| | - Shmaryahu Hoz
- Department of Chemistry, Queen’s University, Kingston, ON, K7L 3N6 Canada, Department of Chemistry and Chemical Engineering, Royal Military College of Canada, Kingston, ON, K7K 7B4 Canada, Departments of Chemistry and Environmental Science, Sir Wilfred Grenfell College (SWGC), Memorial University of Newfoundland, Corner Brook, Newfoundland and Labrador, A2H 6P9 Canada, and Department of Chemistry, Bar Ilan University, Ramat-Gan, Israel
| | - Erwin Buncel
- Department of Chemistry, Queen’s University, Kingston, ON, K7L 3N6 Canada, Department of Chemistry and Chemical Engineering, Royal Military College of Canada, Kingston, ON, K7K 7B4 Canada, Departments of Chemistry and Environmental Science, Sir Wilfred Grenfell College (SWGC), Memorial University of Newfoundland, Corner Brook, Newfoundland and Labrador, A2H 6P9 Canada, and Department of Chemistry, Bar Ilan University, Ramat-Gan, Israel
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Petitjean A, Cuccia LA, Schmutz M, Lehn JM. Naphthyridine-Based Helical Foldamers and Macrocycles: Synthesis, Cation Binding, and Supramolecular Assemblies. J Org Chem 2008; 73:2481-95. [DOI: 10.1021/jo702495u] [Citation(s) in RCA: 83] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Anne Petitjean
- Laboratoire de Chimie Supramoléculaire, Institut de Science et d'Ingénierie Supramoléculaires, Université Louis Pasteur, 8 Allée Gaspard Monge, BP 70028, 67083 Strasbourg Cedex, France, and Institut Charles Sadron, BP 40016, 6 rue Boussingault, 67083 Strasbourg Cedex, France
| | - Louis A. Cuccia
- Laboratoire de Chimie Supramoléculaire, Institut de Science et d'Ingénierie Supramoléculaires, Université Louis Pasteur, 8 Allée Gaspard Monge, BP 70028, 67083 Strasbourg Cedex, France, and Institut Charles Sadron, BP 40016, 6 rue Boussingault, 67083 Strasbourg Cedex, France
| | - Marc Schmutz
- Laboratoire de Chimie Supramoléculaire, Institut de Science et d'Ingénierie Supramoléculaires, Université Louis Pasteur, 8 Allée Gaspard Monge, BP 70028, 67083 Strasbourg Cedex, France, and Institut Charles Sadron, BP 40016, 6 rue Boussingault, 67083 Strasbourg Cedex, France
| | - Jean-Marie Lehn
- Laboratoire de Chimie Supramoléculaire, Institut de Science et d'Ingénierie Supramoléculaires, Université Louis Pasteur, 8 Allée Gaspard Monge, BP 70028, 67083 Strasbourg Cedex, France, and Institut Charles Sadron, BP 40016, 6 rue Boussingault, 67083 Strasbourg Cedex, France
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