51
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San LK, Spisak SN, Dubceac C, Deng SHM, Kuvychko IV, Petrukhina MA, Wang X, Popov AA, Strauss SH, Boltalina OV. Experimental and DFT Studies of the Electron‐Withdrawing Ability of Perfluoroalkyl (R
F
) Groups: Electron Affinities of PAH(R
F
)
n
Increase Significantly with Increasing R
F
Chain Length. Chemistry 2017; 24:1441-1447. [DOI: 10.1002/chem.201704868] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2017] [Indexed: 11/06/2022]
Affiliation(s)
- Long K. San
- Department of Chemistry Colorado State University Fort Collins Colorado 80523 USA
| | - Sarah N. Spisak
- Department of Chemistry University at Albany, State University of New York Albany New York 12222 USA
| | - Cristina Dubceac
- Department of Chemistry University at Albany, State University of New York Albany New York 12222 USA
| | - Shihu H M. Deng
- Physical Sciences Division Pacific Northwest National Laboratory MS K8 88, P.O. Box 999 Richland Washington 99352 USA
| | - Igor V. Kuvychko
- Department of Chemistry Colorado State University Fort Collins Colorado 80523 USA
| | - Marina A. Petrukhina
- Department of Chemistry University at Albany, State University of New York Albany New York 12222 USA
| | - Xue‐Bin Wang
- Physical Sciences Division Pacific Northwest National Laboratory MS K8 88, P.O. Box 999 Richland Washington 99352 USA
| | - Alexey A. Popov
- Department of Electrochemistry and Conducting Polymers Liebniz Institute for Solid State and Materials Research Dresden 01069 Germany
| | - Steven H. Strauss
- Department of Chemistry Colorado State University Fort Collins Colorado 80523 USA
| | - Olga V. Boltalina
- Department of Chemistry Colorado State University Fort Collins Colorado 80523 USA
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52
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Van Craen D, Rath WH, Huth M, Kemp L, Räuber C, Wollschläger JM, Schalley CA, Valkonen A, Rissanen K, Albrecht M. Chasing Weak Forces: Hierarchically Assembled Helicates as a Probe for the Evaluation of the Energetics of Weak Interactions. J Am Chem Soc 2017; 139:16959-16966. [PMID: 29068687 DOI: 10.1021/jacs.7b10098] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
London dispersion forces are the weakest interactions between molecules. Because of this, their influence on chemical processes is often low, but can definitely not be ignored, and even becomes important in cases of molecules with large contact surfaces. Hierarchically assembled dinuclear titanium(IV) helicates represent a rare example in which the direct observation of London dispersion forces is possible in solution even in the presence of strong cohesive solvent effects. Hereby, the dispersion forces do not unlimitedly support the formation of the dimeric complexes. Although they have some favorable enthalpic contribution to the dimerization of the monomeric complex units, large flexible substituents become conformationally restricted by the interactions leading to an entropic disadvantage. The dimeric helicates are entropically destabilized.
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Affiliation(s)
- David Van Craen
- Institut für Organische Chemie, RWTH Aachen University , Landoltweg 1, Aachen 52074, Germany
| | - Wolfgang H Rath
- Institut für Organische Chemie, RWTH Aachen University , Landoltweg 1, Aachen 52074, Germany
| | - Marina Huth
- Institut für Organische Chemie, RWTH Aachen University , Landoltweg 1, Aachen 52074, Germany
| | - Laura Kemp
- Institut für Organische Chemie, RWTH Aachen University , Landoltweg 1, Aachen 52074, Germany
| | - Christoph Räuber
- Institut für Organische Chemie, RWTH Aachen University , Landoltweg 1, Aachen 52074, Germany
| | - Jan M Wollschläger
- Institut für Chemie und Biochemie-Organische Chemie, Freie Universität Berlin , Takustrasse 3, Berlin 14195, Germany
| | - Christoph A Schalley
- Institut für Chemie und Biochemie-Organische Chemie, Freie Universität Berlin , Takustrasse 3, Berlin 14195, Germany
| | - Arto Valkonen
- Department of Chemistry, Nanoscience Center, University of Jyvaskyla , Survontie 9 B, Jyväskylä 40014, Finland
| | - Kari Rissanen
- Department of Chemistry, Nanoscience Center, University of Jyvaskyla , Survontie 9 B, Jyväskylä 40014, Finland
| | - Markus Albrecht
- Institut für Organische Chemie, RWTH Aachen University , Landoltweg 1, Aachen 52074, Germany
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53
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Pascoe DJ, Ling KB, Cockroft SL. The Origin of Chalcogen-Bonding Interactions. J Am Chem Soc 2017; 139:15160-15167. [PMID: 28985065 DOI: 10.1021/jacs.7b08511] [Citation(s) in RCA: 339] [Impact Index Per Article: 48.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Favorable molecular interactions between group 16 elements have been implicated in catalysis, biological processes, and materials and medicinal chemistry. Such interactions have since become known as chalcogen bonds by analogy to hydrogen and halogen bonds. Although the prevalence and applications of chalcogen-bonding interactions continues to develop, debate still surrounds the energetic significance and physicochemical origins of this class of σ-hole interaction. Here, synthetic molecular balances were used to perform a quantitative experimental investigation of chalcogen-bonding interactions. Over 160 experimental conformational free energies were measured in 13 different solvents to examine the energetics of O···S, O···Se, S···S, O···HC, and S···HC contacts and the associated substituent and solvent effects. The strongest chalcogen-bonding interactions were found to be at least as strong as conventional H-bonds, but unlike H-bonds, surprisingly independent of the solvent. The independence of the conformational free energies on solvent polarity, polarizability, and H-bonding characteristics showed that electrostatic, solvophobic, and van der Waals dispersion forces did not account for the observed experimental trends. Instead, a quantitative relationship between the experimental conformational free energies and computed molecular orbital energies was consistent with the chalcogen-bonding interactions being dominated by n → σ* orbital delocalization between a lone pair (n) of a (thio)amide donor and the antibonding σ* orbital of an acceptor thiophene or selenophene. Interestingly, stabilization was manifested through the same acceptor molecular orbital irrespective of whether a direct chalcogen···chalcogen or chalcogen···H-C contact was made. Our results underline the importance of often-overlooked orbital delocalization effects in conformational control and molecular recognition phenomena.
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Affiliation(s)
- Dominic J Pascoe
- EaStCHEM School of Chemistry, University of Edinburgh , Joseph Black Building, David Brewster Road, Edinburgh EH9 3FJ, U.K
| | - Kenneth B Ling
- Syngenta, Jealott's Hill International Research Centre, Bracknell, Berkshire RG42 6EY, U.K
| | - Scott L Cockroft
- EaStCHEM School of Chemistry, University of Edinburgh , Joseph Black Building, David Brewster Road, Edinburgh EH9 3FJ, U.K
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54
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Pollice R, Bot M, Kobylianskii IJ, Shenderovich I, Chen P. Attenuation of London Dispersion in Dichloromethane Solutions. J Am Chem Soc 2017; 139:13126-13140. [DOI: 10.1021/jacs.7b06997] [Citation(s) in RCA: 72] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Robert Pollice
- Laboratorium für Organische
Chemie, ETH Zurich, Vladimir-Prelog-Weg 2, CH-8093 Zurich, Switzerland
| | - Marek Bot
- Laboratorium für Organische
Chemie, ETH Zurich, Vladimir-Prelog-Weg 2, CH-8093 Zurich, Switzerland
| | - Ilia J. Kobylianskii
- Laboratorium für Organische
Chemie, ETH Zurich, Vladimir-Prelog-Weg 2, CH-8093 Zurich, Switzerland
| | - Ilya Shenderovich
- Laboratorium für Organische
Chemie, ETH Zurich, Vladimir-Prelog-Weg 2, CH-8093 Zurich, Switzerland
| | - Peter Chen
- Laboratorium für Organische
Chemie, ETH Zurich, Vladimir-Prelog-Weg 2, CH-8093 Zurich, Switzerland
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55
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56
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Li P, Maier JM, Vik EC, Yehl CJ, Dial BE, Rickher AE, Smith MD, Pellechia PJ, Shimizu KD. Stabilizing Fluorine–π Interactions. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201702950] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Affiliation(s)
- Ping Li
- Department of Chemistry and Biochemistry University of South Carolina Columbia SC 29208 USA
| | - Josef M. Maier
- Department of Chemistry and Biochemistry University of South Carolina Columbia SC 29208 USA
| | - Erik C. Vik
- Department of Chemistry and Biochemistry University of South Carolina Columbia SC 29208 USA
| | - Christopher J. Yehl
- Department of Chemistry and Biochemistry University of South Carolina Columbia SC 29208 USA
| | - Brent E. Dial
- Department of Chemistry and Biochemistry University of South Carolina Columbia SC 29208 USA
| | - Amanda E. Rickher
- Department of Chemistry and Biochemistry University of South Carolina Columbia SC 29208 USA
| | - Mark D. Smith
- Department of Chemistry and Biochemistry University of South Carolina Columbia SC 29208 USA
| | - Perry J. Pellechia
- Department of Chemistry and Biochemistry University of South Carolina Columbia SC 29208 USA
| | - Ken D. Shimizu
- Department of Chemistry and Biochemistry University of South Carolina Columbia SC 29208 USA
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57
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Li P, Maier JM, Vik EC, Yehl CJ, Dial BE, Rickher AE, Smith MD, Pellechia PJ, Shimizu KD. Stabilizing Fluorine–π Interactions. Angew Chem Int Ed Engl 2017; 56:7209-7212. [DOI: 10.1002/anie.201702950] [Citation(s) in RCA: 58] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2017] [Indexed: 12/19/2022]
Affiliation(s)
- Ping Li
- Department of Chemistry and Biochemistry University of South Carolina Columbia SC 29208 USA
| | - Josef M. Maier
- Department of Chemistry and Biochemistry University of South Carolina Columbia SC 29208 USA
| | - Erik C. Vik
- Department of Chemistry and Biochemistry University of South Carolina Columbia SC 29208 USA
| | - Christopher J. Yehl
- Department of Chemistry and Biochemistry University of South Carolina Columbia SC 29208 USA
| | - Brent E. Dial
- Department of Chemistry and Biochemistry University of South Carolina Columbia SC 29208 USA
| | - Amanda E. Rickher
- Department of Chemistry and Biochemistry University of South Carolina Columbia SC 29208 USA
| | - Mark D. Smith
- Department of Chemistry and Biochemistry University of South Carolina Columbia SC 29208 USA
| | - Perry J. Pellechia
- Department of Chemistry and Biochemistry University of South Carolina Columbia SC 29208 USA
| | - Ken D. Shimizu
- Department of Chemistry and Biochemistry University of South Carolina Columbia SC 29208 USA
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58
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Zhang C, Tao T, Yuan W, Zhang L, Zhang X, Yao J, Zhang Y, Lu H. Fluorous Solid-Phase Extraction Technique Based on Nanographite Fluoride. Anal Chem 2017; 89:4566-4572. [DOI: 10.1021/acs.analchem.6b05071] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Cheng Zhang
- Shanghai
Cancer Center and Institutes of Biomedical Sciences, Fudan University, Shanghai, 200032, P. R. China
- Department
of Chemistry, Fudan University, Shanghai, 200433, P. R. China
| | - Tao Tao
- Shanghai
Cancer Center and Institutes of Biomedical Sciences, Fudan University, Shanghai, 200032, P. R. China
- Department
of Chemistry, Fudan University, Shanghai, 200433, P. R. China
| | - Wenjuan Yuan
- Shanghai
Cancer Center and Institutes of Biomedical Sciences, Fudan University, Shanghai, 200032, P. R. China
- Department
of Chemistry, Fudan University, Shanghai, 200433, P. R. China
| | - Lei Zhang
- Shanghai
Cancer Center and Institutes of Biomedical Sciences, Fudan University, Shanghai, 200032, P. R. China
| | - Xiaoqin Zhang
- Shanghai
Cancer Center and Institutes of Biomedical Sciences, Fudan University, Shanghai, 200032, P. R. China
- Department
of Chemistry, Fudan University, Shanghai, 200433, P. R. China
| | - Jun Yao
- Shanghai
Cancer Center and Institutes of Biomedical Sciences, Fudan University, Shanghai, 200032, P. R. China
| | - Ying Zhang
- Shanghai
Cancer Center and Institutes of Biomedical Sciences, Fudan University, Shanghai, 200032, P. R. China
| | - Haojie Lu
- Shanghai
Cancer Center and Institutes of Biomedical Sciences, Fudan University, Shanghai, 200032, P. R. China
- Department
of Chemistry, Fudan University, Shanghai, 200433, P. R. China
- Key
Laboratory of Glycoconjugates Research Ministry of Public Health, Fudan University, Shanghai, 200032, P. R. China
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59
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Hwang JW, Li P, Shimizu KD. Synergy between experimental and computational studies of aromatic stacking interactions. Org Biomol Chem 2016; 15:1554-1564. [PMID: 27878156 DOI: 10.1039/c6ob01985d] [Citation(s) in RCA: 50] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Aromatic stacking interactions are one of the most common types of non-covalent interactions. However, their fundamental origins and the ability to accurately predict their stability trends are still an active area of research. The study of aromatic stacking interactions has been particularly challenging. The interaction involves a delicate balance of multiple forces, and the aromatic surfaces can readily adopt different interaction geometries. Thus, the collaborative efforts of theoretical and experimental researchers have been essential to understand and build more accurate predictive models of aromatic stacking interactions.
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Affiliation(s)
- Jung Wun Hwang
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, SC 29208, USA.
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60
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Yamada S, Yamamoto N, Takamori E. Synthesis of Molecular Seesaw Balances and the Evaluation of Pyridinium−π Interactions. J Org Chem 2016; 81:11819-11830. [DOI: 10.1021/acs.joc.6b02295] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Shinji Yamada
- Department of Chemistry, Faculty of Science, Ochanomizu University, 2-1-1 Otsuka, Bunkyo-ku,
Tokyo 112-8610, Japan
| | - Natsuo Yamamoto
- Department of Chemistry, Faculty of Science, Ochanomizu University, 2-1-1 Otsuka, Bunkyo-ku,
Tokyo 112-8610, Japan
| | - Eri Takamori
- Department of Chemistry, Faculty of Science, Ochanomizu University, 2-1-1 Otsuka, Bunkyo-ku,
Tokyo 112-8610, Japan
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61
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Abstract
On the basis of many literature measurements, a critical overview is given on essential noncovalent interactions in synthetic supramolecular complexes, accompanied by analyses with selected proteins. The methods, which can be applied to derive binding increments for single noncovalent interactions, start with the evaluation of consistency and additivity with a sufficiently large number of different host-guest complexes by applying linear free energy relations. Other strategies involve the use of double mutant cycles, of molecular balances, of dynamic combinatorial libraries, and of crystal structures. Promises and limitations of these strategies are discussed. Most of the analyses stem from solution studies, but a few also from gas phase. The empirically derived interactions are then presented on the basis of selected complexes with respect to ion pairing, hydrogen bonding, electrostatic contributions, halogen bonding, π-π-stacking, dispersive forces, cation-π and anion-π interactions, and contributions from the hydrophobic effect. Cooperativity in host-guest complexes as well as in self-assembly, and entropy factors are briefly highlighted. Tables with typical values for single noncovalent free energies and polarity parameters are in the Supporting Information.
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Affiliation(s)
- Frank Biedermann
- Institute of Nanotechnology, Karlsruhe Institute of Technology (KIT) , Hermann-von-Helmholtz Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
| | - Hans-Jörg Schneider
- FR Organische Chemie der Universität des Saarlandes , D-66041 Saarbrücken, Germany
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62
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Tatikonda R, Bhowmik S, Rissanen K, Haukka M, Cametti M. Metallogel formation in aqueous DMSO by perfluoroalkyl decorated terpyridine ligands. Dalton Trans 2016; 45:12756-62. [DOI: 10.1039/c6dt02008a] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
In this paper, we present a series of stable and thermoreversible metallogels formed by the combination of terpyridine based ligands decorated with perfluorinated C8F17 tags and several divalent d-block metal salts.
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Affiliation(s)
| | - Sandip Bhowmik
- University of Jyväskylä
- Department of Chemistry
- FI-40014 University of Jyväskylä
- Finland
| | - Kari Rissanen
- University of Jyväskylä
- Department of Chemistry
- FI-40014 University of Jyväskylä
- Finland
| | - Matti Haukka
- University of Jyväskylä
- Department of Chemistry
- FI-40014 University of Jyväskylä
- Finland
| | - Massimo Cametti
- Department of Chemistry
- Materials and Chemical Engineering “Giulio Natta” Politecnico di Milano
- Milano
- Italy
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63
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Yang L, Brazier JB, Hubbard TA, Rogers DM, Cockroft SL. Can Dispersion Forces Govern Aromatic Stacking in an Organic Solvent? Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201508056] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Lixu Yang
- EaStCHEM School of Chemistry; University of Edinburgh, Joseph Black Building; David Brewster Road Edinburgh EH9 3FJ UK
| | - John B. Brazier
- EaStCHEM School of Chemistry; University of Edinburgh, Joseph Black Building; David Brewster Road Edinburgh EH9 3FJ UK
| | - Thomas A. Hubbard
- EaStCHEM School of Chemistry; University of Edinburgh, Joseph Black Building; David Brewster Road Edinburgh EH9 3FJ UK
| | - David M. Rogers
- EaStCHEM School of Chemistry; University of Edinburgh, Joseph Black Building; David Brewster Road Edinburgh EH9 3FJ UK
| | - Scott L. Cockroft
- EaStCHEM School of Chemistry; University of Edinburgh, Joseph Black Building; David Brewster Road Edinburgh EH9 3FJ UK
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64
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Yang L, Brazier JB, Hubbard TA, Rogers DM, Cockroft SL. Can Dispersion Forces Govern Aromatic Stacking in an Organic Solvent? Angew Chem Int Ed Engl 2015; 55:912-6. [DOI: 10.1002/anie.201508056] [Citation(s) in RCA: 71] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2015] [Revised: 10/13/2015] [Indexed: 12/27/2022]
Affiliation(s)
- Lixu Yang
- EaStCHEM School of Chemistry; University of Edinburgh, Joseph Black Building; David Brewster Road Edinburgh EH9 3FJ UK
| | - John B. Brazier
- EaStCHEM School of Chemistry; University of Edinburgh, Joseph Black Building; David Brewster Road Edinburgh EH9 3FJ UK
| | - Thomas A. Hubbard
- EaStCHEM School of Chemistry; University of Edinburgh, Joseph Black Building; David Brewster Road Edinburgh EH9 3FJ UK
| | - David M. Rogers
- EaStCHEM School of Chemistry; University of Edinburgh, Joseph Black Building; David Brewster Road Edinburgh EH9 3FJ UK
| | - Scott L. Cockroft
- EaStCHEM School of Chemistry; University of Edinburgh, Joseph Black Building; David Brewster Road Edinburgh EH9 3FJ UK
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65
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Emenike BU, Bey SN, Bigelow BC, Chakravartula SVS. Quantitative model for rationalizing solvent effect in noncovalent CH-Aryl interactions. Chem Sci 2015; 7:1401-1407. [PMID: 29910898 PMCID: PMC5975927 DOI: 10.1039/c5sc03550c] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2015] [Accepted: 11/17/2015] [Indexed: 11/21/2022] Open
Abstract
Establishing a linear relationship between CH–aryl interaction energies and the properties of the solvating media.
The strength of CH–aryl interactions (ΔG) in 14 solvents was determined via the conformational analysis of a molecular torsion balance. The molecular balance adopted folded and unfolded conformers in which the ratio of the conformers in solution provided a quantitative measure of ΔG as a function of solvation. While a single empirical solvent parameter based on solvent polarity failed to explain solvent effect in the molecular balance, it is shown that these ΔG values can be correlated through a multiparameter linear solvation energy relationship (LSER) using the equation introduced by Kamlet and Taft. The resulting LSER equation [ΔG = –0.24 + 0.23α – 0.68β – 0.1π* + 0.09δ]—expresses ΔG as a function of Kamlet–Taft solvent parameters—revealed that specific solvent effects (α and β) are mainly responsible for “tipping” the molecular balance in favour of one conformer over the other, where α represents a solvents' hydrogen-bond acidity and β represents a solvents' hydrogen-bond basicity. Furthermore, using extrapolated data (α and β) and the known π* value for the gas phase, the LSER equation predicted ΔG in the gas phase to be –0.31 kcal mol–1, which agrees with –0.35 kcal mol–1 estimated from DFT-D calculations.
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Affiliation(s)
- Bright U Emenike
- Department of Chemistry & Physics , State University of New York , 223 Store Hill Road, Old Westbury , NY 11568 , USA .
| | - Sara N Bey
- Department of Chemistry & Physics , State University of New York , 223 Store Hill Road, Old Westbury , NY 11568 , USA .
| | - Brianna C Bigelow
- Department of Chemistry & Physics , State University of New York , 223 Store Hill Road, Old Westbury , NY 11568 , USA .
| | - Srinivas V S Chakravartula
- Department of Chemistry & Biochemistry , Hunter College Graduation Center , City University of New York , 695 Park Avenue New York , NY 10065 , USA
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66
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Jiménez-Moreno E, Jiménez-Osés G, Gómez AM, Santana AG, Corzana F, Bastida A, Jiménez-Barbero J, Asensio JL. A thorough experimental study of CH/π interactions in water: quantitative structure-stability relationships for carbohydrate/aromatic complexes. Chem Sci 2015; 6:6076-6085. [PMID: 28717448 PMCID: PMC5504637 DOI: 10.1039/c5sc02108a] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2015] [Accepted: 07/29/2015] [Indexed: 12/01/2022] Open
Abstract
CH/π interactions play a key role in a large variety of molecular recognition processes of biological relevance. However, their origins and structural determinants in water remain poorly understood. In order to improve our comprehension of these important interaction modes, we have performed a quantitative experimental analysis of a large data set comprising 117 chemically diverse carbohydrate/aromatic stacking complexes, prepared through a dynamic combinatorial approach recently developed by our group. The obtained free energies provide a detailed picture of the structure-stability relationships that govern the association process, opening the door to the rational design of improved carbohydrate-based ligands or carbohydrate receptors. Moreover, this experimental data set, supported by quantum mechanical calculations, has contributed to the understanding of the main driving forces that promote complex formation, underlining the key role played by coulombic and solvophobic forces on the stabilization of these complexes. This represents the most quantitative and extensive experimental study reported so far for CH/π complexes in water.
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Affiliation(s)
- Ester Jiménez-Moreno
- Instituto de Química Orgánica (IQOG-CSIC) , Juan de la Cierva 3 , 28006 Madrid , Spain . ; ; Tel: +34 915622900
| | - Gonzalo Jiménez-Osés
- Dept. Química and Centro de Investigación en Síntesis Química , Universidad de La Rioja , Logroño , Spain
- Institute of Biocomputation and Physics of Complex Systems (BIFI) , University of Zaragoza , BIFI-IQFR (CSIC) , Zaragoza , Spain
| | - Ana M Gómez
- Instituto de Química Orgánica (IQOG-CSIC) , Juan de la Cierva 3 , 28006 Madrid , Spain . ; ; Tel: +34 915622900
| | - Andrés G Santana
- Instituto de Química Orgánica (IQOG-CSIC) , Juan de la Cierva 3 , 28006 Madrid , Spain . ; ; Tel: +34 915622900
| | - Francisco Corzana
- Dept. Química and Centro de Investigación en Síntesis Química , Universidad de La Rioja , Logroño , Spain
| | - Agatha Bastida
- Instituto de Química Orgánica (IQOG-CSIC) , Juan de la Cierva 3 , 28006 Madrid , Spain . ; ; Tel: +34 915622900
| | - Jesus Jiménez-Barbero
- Centro de Investigaciones Biológicas (CIB-CSIC) , Madrid , Spain
- Center for Cooperative Research in Biosciences (CIC-bioGUNE) , Derio-Bizkaia , Spain
- Basque Foundation for Science , Ikerbasque , Bilbao , Spain
| | - Juan Luis Asensio
- Instituto de Química Orgánica (IQOG-CSIC) , Juan de la Cierva 3 , 28006 Madrid , Spain . ; ; Tel: +34 915622900
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67
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Yang L, Adam C, Cockroft SL. Quantifying Solvophobic Effects in Nonpolar Cohesive Interactions. J Am Chem Soc 2015; 137:10084-7. [DOI: 10.1021/jacs.5b05736] [Citation(s) in RCA: 79] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Lixu Yang
- EaStCHEM School of Chemistry, University of Edinburgh, Joseph Black
Building, David Brewster Road, Edinburgh EH9 3FJ, U.K
| | - Catherine Adam
- EaStCHEM School of Chemistry, University of Edinburgh, Joseph Black
Building, David Brewster Road, Edinburgh EH9 3FJ, U.K
| | - Scott L. Cockroft
- EaStCHEM School of Chemistry, University of Edinburgh, Joseph Black
Building, David Brewster Road, Edinburgh EH9 3FJ, U.K
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68
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Assaf KI, Ural MS, Pan F, Georgiev T, Simova S, Rissanen K, Gabel D, Nau WM. Water Structure Recovery in Chaotropic Anion Recognition: High-Affinity Binding of Dodecaborate Clusters to γ-Cyclodextrin. Angew Chem Int Ed Engl 2015; 54:6852-6. [PMID: 25951349 PMCID: PMC4510780 DOI: 10.1002/anie.201412485] [Citation(s) in RCA: 194] [Impact Index Per Article: 21.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2014] [Revised: 03/18/2015] [Indexed: 12/29/2022]
Abstract
Dodecaborate anions of the type B12X12(2-) and B12X11Y(2-) (X=H, Cl, Br, I and Y=OH, SH, NH3(+), NR3(+)) form strong (K(a) up to 10(6) L mol(-1), for B12Br12(2-)) inclusion complexes with γ-cyclodextrin (γ-CD). The micromolar affinities reached are the highest known for this native CD. The complexation exhibits highly negative enthalpies (up to -25 kcal mol(-1)) and entropies (TΔS up to -18.4 kcal mol(-1), both for B12I12(2-)), which position these guests at the bottom end of the well-known enthalpy-entropy correlation for CDs. The high driving force can be traced back to a chaotropic effect, according to which chaotropic anions have an intrinsic affinity to hydrophobic cavities in aqueous solution. In line with this argument, salting-in effects revealed dodecaborates as superchaotropic dianions.
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Affiliation(s)
- Khaleel I Assaf
- Department of Life Sciences and Chemistry, Jacobs University Bremen, Campus Ring 1, 28759 Bremen (Germany)
| | - Merve S Ural
- Department of Life Sciences and Chemistry, Jacobs University Bremen, Campus Ring 1, 28759 Bremen (Germany)
| | - Fangfang Pan
- University of Jyvaskyla, Department of Chemistry, Nanoscience Center, P.O. Box. 35, 40014 University of Jyvaskyla (Finland)
| | - Tony Georgiev
- Department of Life Sciences and Chemistry, Jacobs University Bremen, Campus Ring 1, 28759 Bremen (Germany)
| | - Svetlana Simova
- Institute of Organic Chemistry with Center of Phytochemistry, Bulgarian Academy of Science, 1113 Sofia (Bulgaria)
| | - Kari Rissanen
- University of Jyvaskyla, Department of Chemistry, Nanoscience Center, P.O. Box. 35, 40014 University of Jyvaskyla (Finland).
| | - Detlef Gabel
- Department of Life Sciences and Chemistry, Jacobs University Bremen, Campus Ring 1, 28759 Bremen (Germany).
| | - Werner M Nau
- Department of Life Sciences and Chemistry, Jacobs University Bremen, Campus Ring 1, 28759 Bremen (Germany).
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Hwang J, Dial BE, Li P, Kozik ME, Smith MD, Shimizu KD. How important are dispersion interactions to the strength of aromatic stacking interactions in solution? Chem Sci 2015; 6:4358-4364. [PMID: 29218207 PMCID: PMC5707509 DOI: 10.1039/c5sc01370d] [Citation(s) in RCA: 79] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2015] [Accepted: 05/15/2015] [Indexed: 01/07/2023] Open
Abstract
The similarity of aromatic stacking energies in solution for varying sized surfaces suggests that dispersion interactions are a minor contributor.
In this study, the contributions of London dispersion forces to the strength of aromatic stacking interactions in solution were experimentally assessed using a small molecule model system. A series of molecular torsion balances were designed to measure an intramolecular stacking interaction via a conformational equilibrium. To probe the importance of the dispersion term, the size and polarizability of one of the aromatic surfaces were systematically increased (benzene, naphthalene, phenanthrene, biphenyl, diphenylethene, and diphenylacetylene). After correcting for solvophobic, linker, and electrostatic substituent effects, the variations due to polarizability were found to be an order of magnitude smaller in solution than in comparison to analogous computational studies in vacuo. These results suggest that in solution the dispersion term is a small component of the aromatic stacking interaction in contrast to their dominant role in vacuo.
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Affiliation(s)
- Jungwun Hwang
- Department of Chemistry and Biochemistry , University of South Carolina , SC 29208 , USA .
| | - Brent E Dial
- Department of Chemistry and Biochemistry , University of South Carolina , SC 29208 , USA .
| | - Ping Li
- Department of Chemistry and Biochemistry , University of South Carolina , SC 29208 , USA .
| | - Michael E Kozik
- Department of Chemistry and Biochemistry , University of South Carolina , SC 29208 , USA .
| | - Mark D Smith
- Department of Chemistry and Biochemistry , University of South Carolina , SC 29208 , USA .
| | - Ken D Shimizu
- Department of Chemistry and Biochemistry , University of South Carolina , SC 29208 , USA .
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Assaf KI, Ural MS, Pan F, Georgiev T, Simova S, Rissanen K, Gabel D, Nau WM. Water Structure Recovery in Chaotropic Anion Recognition: High-Affinity Binding of Dodecaborate Clusters to γ-Cyclodextrin. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201412485] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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71
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Kolaříková V, Šimůnek O, Rybáčková M, Cvačka J, Březinová A, Kvíčala J. Transition metal complexes bearing NHC ligands substituted with secondary polyfluoroalkyl groups. Dalton Trans 2015; 44:19663-73. [DOI: 10.1039/c5dt02258d] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Silver and palladium complexes bearing dihydroimidazolylidene or imidazolidinylidene NHC ligands substituted with racemic secondary polyfluoroalkyl groups were synthesized.
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Affiliation(s)
- V. Kolaříková
- Department of Organic Chemistry
- University of Chemistry and Technology
- Prague
- 166 28 Prague 6
- Czech Republic
| | - O. Šimůnek
- Department of Organic Chemistry
- University of Chemistry and Technology
- Prague
- 166 28 Prague 6
- Czech Republic
| | - M. Rybáčková
- Department of Organic Chemistry
- University of Chemistry and Technology
- Prague
- 166 28 Prague 6
- Czech Republic
| | - J. Cvačka
- Institute of Organic Chemistry and Biochemistry
- Academy of Sciences of the Czech Republic
- 166 10 Prague 6
- Czech Republic
| | - A. Březinová
- Institute of Organic Chemistry and Biochemistry
- Academy of Sciences of the Czech Republic
- 166 10 Prague 6
- Czech Republic
| | - J. Kvíčala
- Department of Organic Chemistry
- University of Chemistry and Technology
- Prague
- 166 28 Prague 6
- Czech Republic
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