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Iman K, Raza MK, Ansari M, Monika, Ansari A, Ahmad M, Ahamad MN, Qasem KMA, Hussain S, Akhtar MN, Shahid M. Novel {Cu 4} and {Cu 4Cd 6} clusters derived from flexible aminoalcohols: synthesis, characterization, crystal structures, and evaluation of anticancer properties. Dalton Trans 2021; 50:11941-11953. [PMID: 34378588 DOI: 10.1039/d1dt00324k] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Two new copper clusters, {Cu4} and {Cu4Cd6}, with polydentate aminoalcohol ligands, diethanol propanolamine (H3L1) and bis-tris{2-[bis(2-hydroxyethyl)amino]-2-(hydroxymethyl)propane-1,3-diol} (H6L2), have been synthesized under mild conditions and characterized thoroughly by single-crystal X-ray diffraction (XRD), infrared spectroscopy, elemental analysis, powder XRD, magnetic and DFT studies, and absorption and fluorescence spectroscopy. The cluster {Cu4} exhibits a rare tetranuclear copper cubane core whereas {Cu4Cd6} forms an unusual heterometallic cage owing to the introduction of the second metal Cd into the ligand. A hexapodal ligand (H6L2) with N and O donor atoms was chosen deliberately for the construction of a high-nuclearity cluster, i.e., {Cu4Cd6}. Interestingly, both the clusters displayed significant cytotoxicity towards human cervical (HeLa) and lung (A549) cancer cells as evident from the shallow IC50 values [15.6 ± 0.8 μM (HeLa), 18.5 ± 1.9 μM (A549) for {Cu4}, and 11.1 ± 1.5 μM (HeLa), 10.2 ± 1.3 μM (A549) for {Cu4Cd6}] obtained after a 24 h incubation. However, moderate toxicity was observed toward immortalized lung epithelial normal cells (HPL1D) with IC50 values of 32.4 ± 1.2 μM for {Cu4} and 27.6 ± 1.7 μM for {Cu4Cd6}. A cellular apoptotic study using HeLa cells revealed that the {Cu4} cluster triggered apoptosis at both the early and late phases while the {Cu4Cd6} cluster facilitate apoptosis mainly at the late apoptotic stage. A standard 2',7'-dichlorodihydrofluorescein-diacetate (DCFH-DA) test affirms that both the clusters enhanced ROS production inside the cancer cells, responsible for promoting cell apoptosis. The decanuclear {Cu4Cd6} clusters demonstrated better anticancer activity compared to the tetranuclear {Cu4} clusters, indicating the role of high nuclearity and additional Cd metal in the enhanced intracellular production of ROS.
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Affiliation(s)
- Khushboo Iman
- Functional Inorganic Materials Lab (FIML), Department of Chemistry, Aligarh Muslim University, Aligarh 202002, India.
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Augusto MG, Santos TMDA, Scaramucci T, Aoki IV, Torres CRG, Hara AT, Borges AB. Protective Effect of Solutions Containing Polymers Associated with Fluoride and Stannous Chloride on Hydroxyapatite Dissolution. Caries Res 2021; 55:122-129. [PMID: 33503639 DOI: 10.1159/000513444] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2020] [Accepted: 11/29/2020] [Indexed: 11/19/2022] Open
Abstract
This study investigated the protective effect of experimental solutions containing 4 polymers (polyoxirane, hydroxypropylmethylcellulose [HPMC], pectin, and an amino methacrylate copolymer [AMC]) in 2 concentrations (low and high) associated or not with sodium fluoride (F; 225 ppm F-) or sodium fluoride plus stannous chloride (FS; 800 ppm Sn2+) on the dissolution of hydroxyapatite crystals (HA). Deionized water was the control. The pretreated HA was added to a 0.3% citric acid solution (pH 3.8). An automatic titrant machine added aliquots of 0.1 N HCl at a rate of 28 μL/min, in a total reaction time of 5 min. Groups were compared with 2-way ANOVA and Tukey's test, and concentrations with Student t test (5%). The zeta potential of the HA treated with the solutions was measured. Significant differences were found for both factors and interaction (p < 0.0001). The treatments with F and FS solutions resulted in a lower amount of dissolved HA than the control. Among the polymers' solutions, only AMC was able to reduce the amount of dissolved HA, changing the surface charge of HA to positive. AMC improved the protective effect of F, but it did not affect FS. Polyoxirane and HPMC reduced the protective potential of the FS solution. No differences were found between the concentrations of the polymers. It was concluded that F and FS reduced the amount of dissolved HA. The protective effect of the experimental solutions against HA dissolution was polymer dependent. The F effect was enhanced by its combination with AMC, but the protection of FS was impaired by polyoxirane and HPMC.
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Affiliation(s)
- Marina Gullo Augusto
- Department of Restorative Dentistry, Institute of Science and Technology, São Paulo State University, UNESP, São José dos Campos, Brazil
| | - Tamires Maria de Andrade Santos
- Department of Restorative Dentistry, Institute of Science and Technology, São Paulo State University, UNESP, São José dos Campos, Brazil
| | - Taís Scaramucci
- Department of Restorative Dentistry, School of Dentistry, University of São Paulo, São Paulo, Brazil
| | - Idalina Vieira Aoki
- Department of Chemical Engineering, Polytechnic School, University of São Paulo, São Paulo, Brazil
| | - Carlos Rocha Gomes Torres
- Department of Restorative Dentistry, Institute of Science and Technology, São Paulo State University, UNESP, São José dos Campos, Brazil
| | - Anderson Takeo Hara
- Department of Cariology, Operative Dentistry and Dental Public Health, Indiana University School of Dentistry, Indianapolis, Indiana, USA
| | - Alessandra Buhler Borges
- Department of Restorative Dentistry, Institute of Science and Technology, São Paulo State University, UNESP, São José dos Campos, Brazil,
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Augusto MG, da Silva LFO, Scaramucci T, Aoki IV, Torres CRG, Borges AB. Protective effect of anti-erosive solutions enhanced by an aminomethacrylate copolymer. J Dent 2020; 105:103540. [PMID: 33249109 DOI: 10.1016/j.jdent.2020.103540] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2020] [Revised: 11/24/2020] [Accepted: 11/25/2020] [Indexed: 10/22/2022] Open
Abstract
OBJECTIVE To investigate if an aminomethacrylate copolymer (AMC) could potentiate the anti-erosive effect of solutions containing sodium fluoride -F (225 ppm F-) and sodium fluoride associated to stannous chloride -FS (800 ppm Sn2+). METHODS The experimental solutions (F, FS, AMC, AMC + F, AMC + FS, and deionized water-DW as negative control) were tested in the presence of acquired pellicle. Polished bovine enamel specimens (n = 13/group) were submitted to an erosion-rehardening cycle (2 h immersion in human saliva, 5 min in 0.3 % citric acid, 1 h in human saliva, 4×/day, 5 days). Treatment with the solutions was performed for 2 min, 2×/day. The rehardening (%Re) and protective (%Prot) potential of the solutions were assessed in the beginning of the experiment, and the surface loss (SL) by contact profilometry after 5 days. Additional bovine specimens (n = 5/group) were prepared to evaluate the contact angle on the treated enamel surface. The zeta potential of the dispersed hydroxyapatite (HA) crystals after the treatment with the solutions was also measured (n = 3/group). Data were statistically analyzed (α = 0.05). RESULTS The association with AMC improved the %Re and the %Prot for W and F, but not for FS. The results of SL were: AMC + F = AMC + FS < AMC < FS < F < DW. The presence of AMC significantly reduced the contact angle on enamel surfaces. The HA presented a strong negative surface charge after the treatment with DW, F and FS, whereas after the treatment with the solutions containing AMC it became positive. CONCLUSION AMC has potential to enhance the anti-erosive effect of fluoride solutions. CLINICAL SIGNIFICANCE The aminomethacrylate copolymer (AMC) may be a promising agent to be added to oral care products for the prevention of erosive tooth wear.
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Affiliation(s)
- Marina Gullo Augusto
- Institute of Science and Technology, Department of Restorative Dentistry, São Paulo State University - UNESP, São José dos Campos, SP, Brazil
| | - Luis Felipe Oliveira da Silva
- Institute of Science and Technology, Department of Restorative Dentistry, São Paulo State University - UNESP, São José dos Campos, SP, Brazil
| | - Tais Scaramucci
- School of Dentistry, Department of Restorative Dentistry, São Paulo University - USP, São Paulo, SP, Brazil
| | - Idalina Vieira Aoki
- Polytechnic School, Department of Chemical Engineering, University of São Paulo - USP, São Paulo, SP, Brazil
| | - Carlos Rocha Gomes Torres
- Institute of Science and Technology, Department of Restorative Dentistry, São Paulo State University - UNESP, São José dos Campos, SP, Brazil
| | - Alessandra Bühler Borges
- Institute of Science and Technology, Department of Restorative Dentistry, São Paulo State University - UNESP, São José dos Campos, SP, Brazil.
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Pierri G, Landi A, Macedi E, Izzo I, De Riccardis F, Dinnebier RE, Tedesco C. Propyne Gas Adsorption in a Cyclic Hexapeptoid: A Combined In Situ XRPD and DFTB Study*. Chemistry 2020; 26:14320-14323. [PMID: 32618043 DOI: 10.1002/chem.202002694] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2020] [Revised: 06/30/2020] [Indexed: 11/06/2022]
Abstract
Cyclic peptoids are macrocyclic N-substituted oligoglycines, with remarkable structural, chemical and physical properties. The gas adsorption properties of a permanently porous hexameric cyclopeptoid decorated with four propargyl and two methoxyethyl side chains were monitored by in situ X-ray powder diffraction (XRPD). High-resolution XRPD data together with Rietveld and density functional based tight binding (DFTB) method allowed us to locate propyne guest molecules inside the host channels, even though the powder sample contains more than one phase. We were able to characterize the host-guest interactions, providing useful information on the host recognition sites and discuss host adaptiveness and host-guest chemical affinity in comparison with analogous compounds.
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Affiliation(s)
- Giovanni Pierri
- Department Chemistry and Biology "A. Zambelli", University of Salerno, Via Giovanni Paolo II 132, 84084, Fisciano (SA), Italy
| | - Alessandro Landi
- Department Chemistry and Biology "A. Zambelli", University of Salerno, Via Giovanni Paolo II 132, 84084, Fisciano (SA), Italy
| | - Eleonora Macedi
- Department of Pure and Applied Science, University of Urbino "Carlo Bo", Via della Stazione 4, 61029, Urbino, Italy
| | - Irene Izzo
- Department Chemistry and Biology "A. Zambelli", University of Salerno, Via Giovanni Paolo II 132, 84084, Fisciano (SA), Italy
| | - Francesco De Riccardis
- Department Chemistry and Biology "A. Zambelli", University of Salerno, Via Giovanni Paolo II 132, 84084, Fisciano (SA), Italy
| | - Robert E Dinnebier
- Max-Planck-Institute for Solid State Research, Heisenbergstrasse 1, Stuttgart, 70569, Germany
| | - Consiglia Tedesco
- Department Chemistry and Biology "A. Zambelli", University of Salerno, Via Giovanni Paolo II 132, 84084, Fisciano (SA), Italy
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Wang H, Fang S, Wu G, Lei Y, Chen Q, Wang H, Wu Y, Lin C, Hong X, Kim SK, Sessler JL, Li H. Constraining Homo- and Heteroanion Dimers in Ultraclose Proximity within a Self-Assembled Hexacationic Cage. J Am Chem Soc 2020; 142:20182-20190. [DOI: 10.1021/jacs.0c10253] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Hongye Wang
- Department of Chemistry, Zhejiang University, Hangzhou 310027, China
| | - Shuai Fang
- Department of Chemistry, Zhejiang University, Hangzhou 310027, China
| | - Guangcheng Wu
- Department of Chemistry, Zhejiang University, Hangzhou 310027, China
| | - Ye Lei
- Department of Chemistry, Zhejiang University, Hangzhou 310027, China
| | - Qiong Chen
- Department of Chemistry, Zhejiang University, Hangzhou 310027, China
| | - Hongliang Wang
- Department of Chemistry, Zhejiang University, Hangzhou 310027, China
| | - Yating Wu
- Department of Chemistry, Zhejiang University, Hangzhou 310027, China
| | - Chuhao Lin
- Department of Chemistry, Zhejiang University, Hangzhou 310027, China
| | - Xin Hong
- Department of Chemistry, Zhejiang University, Hangzhou 310027, China
| | - Sung Kuk Kim
- Department of Chemistry, Research Institute of Natural Science, Gyeongsang National University, Jinju, 660-701, Korea
| | - Jonathan L. Sessler
- Department of Chemistry, The University of Texas at Austin, 105 E. 24th Street-A5300, Austin, Texas 78712-1224 United States
| | - Hao Li
- Department of Chemistry, Zhejiang University, Hangzhou 310027, China
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Gaur A, Avula NVS, Balasubramanian S. Insights into the Stabilization of Fluoride Ions in Ionic Liquids: Pointers to Better Fluorinating Agents. J Phys Chem B 2020; 124:8844-8856. [PMID: 32930587 DOI: 10.1021/acs.jpcb.0c04939] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The fluorination efficiency of a fluorinating agent depends on the free availability of the fluoride ions, which in turn depends on its interaction with its solvation shell. A stable fluoride-based poor solvate ionic liquid (SIL) comprising 1-ethyl-3-methylimidazolium (EMIM) cation and ethylene glycol (EG) was recently reported and demonstrated as a fluorinating agent. Herein, we performed ab initio calculations and ab initio molecular dynamics simulations to gain a microscopic understanding of the intermolecular interactions in this SIL in gas, liquid, and crystalline phases. Ethylene glycol (EG), being capable of forming hydrogen bond(s) with the fluoride ion, prevents the latter from reacting with the EMIM cation. Fluoride forms hydrogen bonds with both the cation and the EG molecule, but it was found to have more affinity toward EG, forming a stronger hydrogen bond with its hydroxyl proton than with the acidic proton of the cation. An optimal concentration of EG in the SIL balances its contribution to stabilizing the fluoride ion and yet making fluoride available for fluorination.
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Affiliation(s)
- Anjali Gaur
- Chemistry and Physics of Materials Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Bangalore 560 064, India
| | - Nikhil V S Avula
- Chemistry and Physics of Materials Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Bangalore 560 064, India
| | - Sundaram Balasubramanian
- Chemistry and Physics of Materials Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Bangalore 560 064, India
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Portis B, Mirchi A, Hasan MH, Khansari ME, Johnson CR, Leszczynski J, Tandon R, Alamgir Hossain M. Cleft‐Induced Ditopic Binding of Spherical Halides with a Hexaurea Receptor. ChemistrySelect 2020. [DOI: 10.1002/slct.201903950] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Bobby Portis
- Department: Chemistry and Biochemistry Institution: Jackson State University 1400 J R Lynch Street Jackson MS 39217 USA
| | - Ali Mirchi
- Department: Chemistry and Biochemistry Institution: Jackson State University 1400 J R Lynch Street Jackson MS 39217 USA
| | - Mohammad H. Hasan
- Department: Microbiology and Immunology, Institution University of Mississippi Medical Center Jackson MS 39216 USA
| | - Maryam Emami Khansari
- Department: Chemistry and Biochemistry Institution: Jackson State University 1400 J R Lynch Street Jackson MS 39217 USA
| | - Corey R. Johnson
- Department: Chemistry and Biochemistry Institution: Jackson State University 1400 J R Lynch Street Jackson MS 39217 USA
| | - Jerzy Leszczynski
- Department: Chemistry and Biochemistry Institution: Jackson State University 1400 J R Lynch Street Jackson MS 39217 USA
| | - Ritesh Tandon
- Department: Microbiology and Immunology, Institution University of Mississippi Medical Center Jackson MS 39216 USA
| | - Md. Alamgir Hossain
- Department: Chemistry and Biochemistry Institution: Jackson State University 1400 J R Lynch Street Jackson MS 39217 USA
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Ilawe NV, Schweitzer-Stenner R, DiGuiseppi D, Wong BM. Is a cross-β-sheet structure of low molecular weight peptides necessary for the formation of fibrils and peptide hydrogels? Phys Chem Chem Phys 2019; 20:18158-18168. [PMID: 29696249 DOI: 10.1039/c8cp00691a] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Short peptides have emerged as versatile building blocks for supramolecular structures and hydrogels. In particular, the presence of aromatic amino acid residues and/or aromatic end groups is generally considered to be a prerequisite for initiating aggregation of short peptides into nanotubes or cross β-sheet type fibrils. However, the cationic GAG tripeptide surprisingly violates these rules. Specifically, in water/ethanol mixtures, GAG peptides aggregate into very long crystalline fibrils at temperatures below 35 °C where they eventually form a spanning network structure and, thus, a hydrogel. Two gel phases are formed in this network, and they differ substantially in chirality and thickness of the underlying fibrils, their rheological parameters, and the kinetics of oligomerization, fibrilization, and gel formation. The spectroscopic data strongly suggests that the observed fibrils do not exhibit canonical cross β-sheet structures and are indicative of a yet unknown secondary conformation. To complement our unusual experimental observations in this perspective article, we performed large-scale DFT calculations to probe the geometry and spectroscopic properties of these GAG oligomers. Most importantly, our experimental and computational results yield rather unconventional structures that are not reminiscent of classical cross-β-sheet structures, and we give two extremely likely candidates for oligomer structures that are consistent with experimental amide I' profiles in IR and vibrational circular dichroism (VCD) spectra of the two gel phases.
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Affiliation(s)
- Niranjan V Ilawe
- Department of Chemical & Environmental Engineering, and Materials Science & Engineering Program, University of California-Riverside, Riverside, CA 92521, USA.
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Jian FF, Liu E, Ma JY. Interesting fluorine anion water clusters [F−·(H2O)n] in metal complex crystals. CrystEngComm 2018. [DOI: 10.1039/c8ce00532j] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Three crystalline complexes containing fluorine anion water cluster were reported. The fluoride anions and water molecules are H-bonded to each other in an alternating fashion within the fluoride–water hybrid cluster, where a fluoride anion plays the important role.
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Affiliation(s)
- Fang Fang Jian
- School of Chemical Engineering and Pharmaceutics
- Henan University of Science and Technology
- Luoyang
- P. R. China
| | - E. Liu
- School of Chemical Engineering and Pharmaceutics
- Henan University of Science and Technology
- Luoyang
- P. R. China
| | - Jun Ying Ma
- School of Chemical Engineering and Pharmaceutics
- Henan University of Science and Technology
- Luoyang
- P. R. China
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Abstract
Two or more anions constrained in close proximity within a single pocket are found in a number of natural systems but a less common motif in artificial systems. This review summarizes work on anion receptors capable of stabilizing anionic dimers, trimers, tetramers and clusters in a well-defined fashion. These systems may provide insights into the fundamental chemistry of anion-anion interactions and provide a guide for understanding in greater detail a number of biological and environmental processes, as well as key tenants of relevance to supramolecular chemistry, extraction, transport, crystal engineering, and the like. The primary goal of this review is to provide a general introduction into multi-anion recognition chemistry for the benefit of supramolecular and non-supramolecular chemists alike.
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Affiliation(s)
- Qing He
- Department of Chemistry, The University of Texas at Austin, 105 East 24th Street-A5300, Austin, Texas 78712-1224, United States
| | - Peiyu Tu
- Department of Chemistry, The University of Texas at Austin, 105 East 24th Street-A5300, Austin, Texas 78712-1224, United States
| | - Jonathan L Sessler
- Center for Supramolecular Chemistry and Catalysis, Shanghai University, Shanghai 200444, China.,Department of Chemistry, The University of Texas at Austin, 105 East 24th Street-A5300, Austin, Texas 78712-1224, United States
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Khaled MB, El Mokadem RK, Weaver JD. Hydrogen Bond Directed Photocatalytic Hydrodefluorination: Overcoming Electronic Control. J Am Chem Soc 2017; 139:13092-13101. [PMID: 28837319 PMCID: PMC6069595 DOI: 10.1021/jacs.7b06847] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
The photocatalytic C-F functionalization of highly fluorinated arenes is a powerful method for accessing functionalized multifluorinated arenes. The decisive step in the determining regioselectivity in fluorine functionalization is fluoride fragmentation from the radical anion of the multifluorinated arene. To date, the availability of regioisomers has been dictated by the innate electronics of the fluorinated arene, limiting the synthetic utility of the chemistry. This study investigates the remarkable ability of a strategically located hydrogen bond to transcend the normal regioselectivity of the C-F functionalization event. A significant rate acceleration is additionally observed for hydrodefluorination of fluorines that can undergo intramolecular hydrogen bonds that form 5-8-membered cycles with moderately acidic N-H's. The hydrogen bond is expected to facilitate the fragmentation not only by bending the C-F bond of the radical anion out of planarity but also by increasing the exothermicity of the fluoride extrusion step through protonation of the naked fluoride. Finally, the synthetic utility of the method is demonstrated in an expedited synthesis of the trifluorinated α-phenyl acetic acid derivative required for the commercial synthesis of Januvia, an antidiabetic drug. This represents the first synthesis of a commercially important multifluorinated arene via a defluorination strategy and is significantly shorter than the current strategy.
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Affiliation(s)
- Mohammad B. Khaled
- Department of Chemistry, Oklahoma State University, Stillwater, OK 74078
| | | | - Jimmie D. Weaver
- Department of Chemistry, Oklahoma State University, Stillwater, OK 74078
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12
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Hoque MN, Das G. Overview of the strategic approaches for the solid-state recognition of hydrated anions. CrystEngComm 2017. [DOI: 10.1039/c6ce02438f] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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13
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Li B, Sun X. Water clusters with anion templates in cucurbit[6]uril supramolecular pseudorotaxanes. INORG CHEM COMMUN 2016. [DOI: 10.1016/j.inoche.2016.10.026] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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14
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Li B, Li X, Sun X, Wang N. Halide-Anion Water Clusters in Cucurbit[6]uril Supramolecular Systems. CHINESE J CHEM 2016. [DOI: 10.1002/cjoc.201600384] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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15
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Ilawe NV, Raeber AE, Schweitzer-Stenner R, Toal SE, Wong BM. Assessing backbone solvation effects in the conformational propensities of amino acid residues in unfolded peptides. Phys Chem Chem Phys 2016; 17:24917-24. [PMID: 26343224 DOI: 10.1039/c5cp03646a] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Conformational ensembles of individual amino acid residues within model GxG peptides (x representing different amino acid residues) are dominated by a mixture of polyproline II (pPII) and β-strand like conformations. We recently discovered rather substantial differences between the enthalpic and entropic contributions to this equilibrium for different amino acid residues. Isoleucine and valine exceed all other amino acid residues in terms of their rather large enthalpic stabilization and entropic destabilization of polyproline II. In order to shed light on these underlying physical mechanisms, we performed high-level DFT calculations to explore the energetics of four representative GxG peptides where x = alanine (A), leucine (L), valine (V), and isoleucine (I) in explicit water (10 H2O molecules with a polarizable continuum water model) and in vacuo. We found that the large energetic contributions to the stabilization of pPII result, to a major extent, from peptide-water, water-water interactions, and changes of the solvent self-energy. Differences between the peptide-solvent interaction energies of hydration in pPII and β-strand peptides are particularly important for the pPII ⇌ β equilibria of the more aliphatic peptides GIG and GLG. Furthermore, we performed a vibrational analysis of the four peptides in both conformations and discovered a rather substantial mixing between water motions and peptide vibrations below 700 cm(-1). We found that the respective vibrational entropies are substantially different for the considered conformations, and their contributions to the Gibbs/Helmholtz energy stabilize β-strand conformations. Taken together, our results underscore the notion of the solvent being the predominant determinant of peptide (and protein) conformations in the unfolded state.
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Affiliation(s)
- Niranjan V Ilawe
- Department of Chemical & Environmental Engineering, and Materials Science & Engineering Program, University of California, Riverside, 900 University Avenue, Riverside, CA 92521, USA.
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16
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Valadbeigi Y. DFT study on the mechanism of trimolecular radical reactions: isomerisation in small clusters. Mol Phys 2016. [DOI: 10.1080/00268976.2016.1202457] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
- Younes Valadbeigi
- Department of Chemistry, Science and Research Branch, Islamic Azad University, Tehran, Iran
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Zhang K, Zhang L, Feng GF, Hu Y, Chang FF, Huang W. Two Types of Anion-Induced Reconstruction of Schiff-Base Macrocyclic Zinc Complexes: Ring-Contraction and Self-Assembly of a Molecular Box. Inorg Chem 2015; 55:16-21. [DOI: 10.1021/acs.inorgchem.5b01451] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Kun Zhang
- State Key Laboratory of Coordination
Chemistry, Nanjing National Laboratory of Microstructures, School
of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, P. R. China
| | - Lei Zhang
- State Key Laboratory of Coordination
Chemistry, Nanjing National Laboratory of Microstructures, School
of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, P. R. China
| | - Gen-Feng Feng
- State Key Laboratory of Coordination
Chemistry, Nanjing National Laboratory of Microstructures, School
of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, P. R. China
| | - Yong Hu
- State Key Laboratory of Coordination
Chemistry, Nanjing National Laboratory of Microstructures, School
of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, P. R. China
| | - Fei-Fan Chang
- State Key Laboratory of Coordination
Chemistry, Nanjing National Laboratory of Microstructures, School
of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, P. R. China
| | - Wei Huang
- State Key Laboratory of Coordination
Chemistry, Nanjing National Laboratory of Microstructures, School
of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, P. R. China
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18
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Anion receptors of N-ferrocenylmethylene-substituted bis-imidazolium salts linked by xylene spacers. J Organomet Chem 2015. [DOI: 10.1016/j.jorganchem.2015.05.013] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Garai S, Rubčić M, Bögge H, Haupt ETK, Gouzerh P, Müller A. A unique fluoride nanocontainer: porous molecular capsules can accommodate an unusually high number of "rather labile" fluoride anions. Angew Chem Int Ed Engl 2015; 54:5879-82. [PMID: 25809440 DOI: 10.1002/anie.201411814] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2014] [Revised: 02/19/2015] [Indexed: 11/09/2022]
Abstract
The present work refers to the challenging issue of fluoride anion recognition/binding in water by taking advantage of the unique possibilities offered by the porous molecular nanocontainers of the {Mo132} Keplerate type allowing the study of a variety of new phenomena. Reaction of the highly reactive carbonate-type capsule with aqueous HF results in the release of carbon dioxide and integration of an unprecedentedly large number of fluoride anions--partly as coordinated ligands at both the pentagonal units and the linkers, partly as a disordered water/fluoride assembly inside the cavity. The internal assembly and some of the fluoride ligands are easily released, which provides interesting options for future studies regarding coordination chemistry and catalysis under confined conditions.
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Affiliation(s)
- Somenath Garai
- Fakultät für Chemie, Universität Bielefeld, Postfach 100131, 33501 Bielefeld (Germany) http://www.uni-bielefeld.de/chemie/ac1/
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20
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Garai S, Rubčić M, Bögge H, Haupt ETK, Gouzerh P, Müller A. A Unique Fluoride Nanocontainer: Porous Molecular Capsules Can Accommodate an Unusually High Number of “Rather Labile” Fluoride Anions. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201411814] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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21
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Chakraborty S, Arunachalam M, Dutta R, Ghosh P. Arene platform based hexa-amide receptors for anion recognition: single crystal X-ray structural and thermodynamic studies. RSC Adv 2015. [DOI: 10.1039/c5ra08747c] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Compartmental recognition of [Cl2(inf>O/inf>O)2]2− in the cavity of p-fluoro-phenyl substituted hexa-amide receptor.
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Affiliation(s)
- Sourav Chakraborty
- Department of Inorganic Chemistry, Indian Association for the Cultivation of Science
- Kolkata 700032
- India
| | - M. Arunachalam
- Department of Inorganic Chemistry, Indian Association for the Cultivation of Science
- Kolkata 700032
- India
| | - Ranjan Dutta
- Department of Inorganic Chemistry, Indian Association for the Cultivation of Science
- Kolkata 700032
- India
| | - Pradyut Ghosh
- Department of Inorganic Chemistry, Indian Association for the Cultivation of Science
- Kolkata 700032
- India
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22
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Basaran I, Wang X, Alamgir A, Wang J, Haque SA, Zhang Y, Powell DR, Leszczynski J, Hossain MA. Synthesis and anion binding properties of a urea-based molecular cleft. Tetrahedron Lett 2015. [DOI: 10.1016/j.tetlet.2014.12.015] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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23
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24
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Chakraborty S, Dutta R, Arunachalam M, Ghosh P. Encapsulation of [X2(H2O)4]2- (X = F/Cl) clusters by pyridyl terminated tripodal amide receptor in aqueous medium: single crystal X-ray structural evidence. Dalton Trans 2014; 43:2061-8. [PMID: 24281328 DOI: 10.1039/c3dt52694a] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new tris-amide receptor L based on 1,3,5-methyl substituted benzene platform and pyridyl as an attached unit is synthesized and explored towards anion recognition in aqueous environment. The presence of pyridyl terminal in L facilitates its aqueous solubility. The binding of halides and oxyanions towards L are examined by (1)H-NMR technique in solution and by single crystal X-ray crystallography in solid state studies. Crystallization of fluoride and chloride with L is carried out in acetone-water (1 : 1, v/v) binary solvent mixture that yields crystals for respective host-guest complexes, [L]2·[F2(H2O)4]·[TBA]2 (1) and [L]2·[Cl2(H2O)4]·[TBA]2 (2) suitable for single crystal X-ray diffraction studies. On the other hand, complexation of L with fluoride in dioxane-acetone (1 : 1, v/v) solvent mixture, results the formation of SiF6(2-) encapsulated complex, [L]2·[SiF6(H2O)2]·[TBA]2 (3). Crystallographic result shows the formation of [F2(H2O)4](2-) and [Cl2(H2O)4](2-) zipped 1D-polymeric tweezer-like assemblies of L in acetone-water (1 : 1, v/v) binary solvent mixture in complexes 1 and 2 respectively. Solution state (1)H-NMR studies in D2O-acetone-d6 (1 : 19, v/v) support 1 : 4 (host-guest) binding stoichiometry of F(-), Cl(-), Br(-), NO3(-), HSO4(-) and H2PO4(-) with L. Binding constants of these investigated anions with L by 1 : 1 binding model are calculated which show the following binding order: NO3(-) ≈ HSO4(-) > F(-) ≈ Cl(-) ≈ Br(-) > H2PO4(-). Further, solution state (19)F-NMR studies are also carried out to establish the F(-) binding with L in DMSO-d6.
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Affiliation(s)
- Sourav Chakraborty
- Department of Inorganic Chemistry Indian Association for the Cultivation of Science, 2A & 2B Raja S. C. Mullick Road, Kolkata 700032, India.
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25
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Dong J, Krasnova L, Finn MG, Sharpless KB. Sulfur(VI) fluoride exchange (SuFEx): another good reaction for click chemistry. Angew Chem Int Ed Engl 2014; 53:9430-48. [PMID: 25112519 DOI: 10.1002/anie.201309399] [Citation(s) in RCA: 764] [Impact Index Per Article: 76.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2013] [Revised: 03/24/2014] [Indexed: 12/11/2022]
Abstract
Aryl sulfonyl chlorides (e.g. Ts-Cl) are beloved of organic chemists as the most commonly used S(VI) electrophiles, and the parent sulfuryl chloride, O2 S(VI) Cl2 , has also been relied on to create sulfates and sulfamides. However, the desired halide substitution event is often defeated by destruction of the sulfur electrophile because the S(VI) Cl bond is exceedingly sensitive to reductive collapse yielding S(IV) species and Cl(-) . Fortunately, the use of sulfur(VI) fluorides (e.g., R-SO2 -F and SO2 F2 ) leaves only the substitution pathway open. As with most of click chemistry, many essential features of sulfur(VI) fluoride reactivity were discovered long ago in Germany.6a Surprisingly, this extraordinary work faded from view rather abruptly in the mid-20th century. Here we seek to revive it, along with John Hyatt's unnoticed 1979 full paper exposition on CH2 CH-SO2 -F, the most perfect Michael acceptor ever found.98 To this history we add several new observations, including that the otherwise very stable gas SO2 F2 has excellent reactivity under the right circumstances. We also show that proton or silicon centers can activate the exchange of SF bonds for SO bonds to make functional products, and that the sulfate connector is surprisingly stable toward hydrolysis. Applications of this controllable ligation chemistry to small molecules, polymers, and biomolecules are discussed.
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Affiliation(s)
- Jiajia Dong
- Department of Chemistry, The Scripps Research Institute, La Jolla, California 92037 (USA)
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26
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Dong J, Krasnova L, Finn MG, Sharpless KB. Schwefel(VI)-fluorid-Austausch (SuFEx): Eine weitere gute Anwendung für die Click-Chemie. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201309399] [Citation(s) in RCA: 172] [Impact Index Per Article: 17.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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27
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Zhuo JB, Zhang CY, Lin CX, Bai S, Xie LL, Yuan YF. Acyclic ferrocene-based imidazolium salts as multi-site anion receptors. J Organomet Chem 2014. [DOI: 10.1016/j.jorganchem.2014.04.018] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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28
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Martí I, Bolte M, Burguete MI, Vicent C, Alfonso I, Luis SV. Tight and Selective Caging of Chloride Ions by a Pseudopeptidic Host. Chemistry 2014; 20:7458-64. [DOI: 10.1002/chem.201303604] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2013] [Revised: 03/24/2014] [Indexed: 11/12/2022]
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Rhaman MM, Ahmed L, Wang J, Powell DR, Leszczynski J, Hossain MA. Encapsulation and selectivity of sulfate with a furan-based hexaazamacrocyclic receptor in water. Org Biomol Chem 2014; 12:2045-8. [PMID: 24554233 PMCID: PMC4428163 DOI: 10.1039/c4ob00116h] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A furan-based hexaazamacrocycle encapsulates a sulfate anion in its cavity showing strong affinity and selectivity for sulfate in water over a wide range of inorganic anions. The DFT calculations demonstrate that the receptor provides binding sites as hydrogen bonding donors and electrostatic positive charges for the strong binding of sulfate.
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Affiliation(s)
- Md Mhahabubur Rhaman
- Department of Chemistry and Biochemistry, Jackson State University, Jackson, MS 39212, USA;
| | - Lucky Ahmed
- Department of Chemistry and Biochemistry, Jackson State University, Jackson, MS 39212, USA;
| | - Jing Wang
- Department of Chemistry and Biochemistry, Jackson State University, Jackson, MS 39212, USA;
| | - Douglas R. Powell
- Department of Chemistry and Biochemistry, University of Oklahoma, Norman, OK 73019, USA;
| | - Jerzy Leszczynski
- Department of Chemistry and Biochemistry, Jackson State University, Jackson, MS 39212, USA;
| | - Md. Alamgir Hossain
- Department of Chemistry and Biochemistry, Jackson State University, Jackson, MS 39212, USA;
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30
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Liu JJ, Lin YJ, Jin GX. Box-like Heterometallic Macrocycles Derived from Bis-Terpyridine Metalloligands. Organometallics 2014. [DOI: 10.1021/om500093p] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Affiliation(s)
- Jing-Jing Liu
- Shanghai Key Laboratory of
Molecular Catalysis and Innovative Material, Department of Chemistry, Fudan University, Shanghai 200433, China
| | - Yue-Jian Lin
- Shanghai Key Laboratory of
Molecular Catalysis and Innovative Material, Department of Chemistry, Fudan University, Shanghai 200433, China
| | - Guo-Xin Jin
- Shanghai Key Laboratory of
Molecular Catalysis and Innovative Material, Department of Chemistry, Fudan University, Shanghai 200433, China
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31
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Basaran I, Khansari ME, Pramanik A, Wong BM, Hossain A. An exclusive fluoride receptor: Fluoride-induced proton transfer to a quinoline-based thiourea. Tetrahedron Lett 2014; 55:1467-1470. [PMID: 24753636 PMCID: PMC3991426 DOI: 10.1016/j.tetlet.2014.01.054] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
A new quinoline-based tripodal thiourea has been synthesized, which exclusively binds fluoride anion in DMSO, showing no affinity for other anions including, chloride, bromide, iodide, perchlorate, nitrate and hydrogen sulfate. As investigated by 1H NMR, the receptor forms both 1:1 and 1:2 complex yielding the binding constants of 2.32(3) (in log β1 ) and 4.39(4) (in log β2 ), respectively; where quinoline groups are protonated by the fluoride-induced proton transfer from the solution to the host molecule. The 1:2 binding is due to the interactions of one fluoride with NH binding sites of urea sites and another fluoride with secondary +NH binding sites within the tripodal pocket. The formation of both 1:1 and 1:2 complexes has been confirmed by the theoretical calculations based on density functional theory (DFT).
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Affiliation(s)
- Ismet Basaran
- Department of Chemistry, Balikesir University, 10145, Balikesir, Turkey
| | - Maryam Emami Khansari
- Department of Chemistry and Biochemistry, Jackson State University, Jackson, MS 39212, USA
| | - Avijit Pramanik
- Department of Chemistry and Biochemistry, Jackson State University, Jackson, MS 39212, USA
| | - Bryan M. Wong
- Department of Chemistry and Department of Materials Science & Engineering, Drexel University, Philadelphia, PA 19104, USA
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32
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Basu A, Chutia R, Das G. Dual modes of binding on the hexafluorosilicate anion by a C3v symmetric flexible tripodal amide ligand in solid state. CrystEngComm 2014. [DOI: 10.1039/c4ce00529e] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A para-nitrophenyl functionalized C3v symmetric flexible tripodal amide ligand, L, shows remarkable solvent dependent dual binding behaviour towards the octahedral hexafluorosilicate anion in solid state.
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Affiliation(s)
- Arghya Basu
- Department of Chemistry
- Indian Institute of Technology Guwahati
- Guwahati 781039, India
| | - Romen Chutia
- Department of Chemistry
- Indian Institute of Technology Guwahati
- Guwahati 781039, India
| | - Gopal Das
- Department of Chemistry
- Indian Institute of Technology Guwahati
- Guwahati 781039, India
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33
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Su ZM, Ye HM, Zhu XX, Xie LL, Bai S, Yuan YF. A selective anion receptor based on 2,2-diferrocenylpropane imidazolium sulphonate salt. J Organomet Chem 2014. [DOI: 10.1016/j.jorganchem.2013.11.006] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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34
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Chakraborty S, Dutta R, Wong BM, Ghosh P. Anion directed conformational diversities of an arene based hexa-amide receptor and recognition of the [F4(H2O)6]4− cluster. RSC Adv 2014. [DOI: 10.1039/c4ra10795k] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The TOC shows difference in binding energies between different conformers after binding with anions of different dimensionalities and conformers A, B & C show structural diversities with anions in case of L.
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Affiliation(s)
- Sourav Chakraborty
- Department of Inorganic Chemistry Indian Association for the Cultivation of Science
- Kolkata 700032, India
| | - Ranjan Dutta
- Department of Inorganic Chemistry Indian Association for the Cultivation of Science
- Kolkata 700032, India
| | - Bryan M. Wong
- Department of Chemical & Environmental Engineering and Materials Science & Engineering Program
- University of California, Riverside
- Riverside, USA
| | - Pradyut Ghosh
- Department of Inorganic Chemistry Indian Association for the Cultivation of Science
- Kolkata 700032, India
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35
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Hoque MN, Das G. Hydrated anion glued capsular and non-capsular assembly of a tripodal host: Solid state recognition of bromide–water [Br5–(H2O)6]5− and iodide–water [I2–(H2O)4]2− clusters in cationic tripodal receptor. CrystEngComm 2014. [DOI: 10.1039/c4ce00149d] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In this report we describe capsular and non-capsular assembly of polyammonium tripodal receptor into supramolecular network driven by anion or anion–water cluster and solid state recognition of unique bromide–water [Br5–(H2O)6]5− and iodide–water [I2–(H2O)4]2− clusters.
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Affiliation(s)
- Md. Najbul Hoque
- Department of Chemistry
- Indian Institute of Technology Guwahati
- , India
| | - Gopal Das
- Department of Chemistry
- Indian Institute of Technology Guwahati
- , India
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36
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Haque SA, Cooper DN, Powell DR, Venkatraman R, Hossain MA. N (1)-(Thio-phen-2-ylmeth-yl)-N (3),N (3)-bis-[3-(thio-phen-2-yl-methyl-ammonio)-prop-yl]propane-1,3-di-ammonium hexa-fluorido-silicate methanol tris-olvate. Acta Crystallogr Sect E Struct Rep Online 2013; 69:o1739-40. [PMID: 24454197 PMCID: PMC3885022 DOI: 10.1107/s1600536813029565] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2013] [Accepted: 10/27/2013] [Indexed: 11/21/2022]
Abstract
In the title compound, C24H40N4S34+·2SiF62−·3CH3OH, the central tertiary amine function is protonated and is connected to three thiophen-2-ylmethylamino-n-propyl groups, forming the arms of a T-shaped cation that has two pockets. Each arm contains one protonated secondary amine function, and each pocket is occupied by one SiF62− anion bonded via two N—H⋯F interactions with the protonated amine group on the middle arm, while two methanol solvent molecules are N—H⋯O hydrogen-bonded with the other secondary protonated amine groups on the side arms. Weak O—H⋯O and O—H⋯F hydrogen bonds between the solvent molecules and between the solvent molecules and the anions, respectively, are also observed. All three thiophene groups in the arms are disordered over two sets of sites, with occupancy ratios of 0.828 (3):0.172 (3), 0.910 (2):0.090 (2) and 0.890 (3):0.110 (3).
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Affiliation(s)
- Syed A Haque
- Department of Chemistry and Biochemistry, Jackson State University, Jackson, MS 39217, USA
| | - Dominique N Cooper
- Department of Chemistry and Biochemistry, Jackson State University, Jackson, MS 39217, USA
| | - Douglas R Powell
- Department of Chemistry and Biochemistry, University of Oklahoma, Norman, OK 73019, USA
| | - Ramaiyer Venkatraman
- Department of Chemistry and Biochemistry, Jackson State University, Jackson, MS 39217, USA
| | - Md Alamgir Hossain
- Department of Chemistry and Biochemistry, Jackson State University, Jackson, MS 39217, USA
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37
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Basu A, Das G. Encapsulation of a discrete cyclic halide water tetramer [X2(H2O)2]2-, X = Cl-/Br- within a dimeric capsular assembly of a tripodal amide receptor. Chem Commun (Camb) 2013; 49:3997-9. [PMID: 23563509 DOI: 10.1039/c3cc40955d] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
A conformationally flexible C3v symmetric N-bridged tripodal amide receptor encapsulates a tetrameric halide water cluster [X2(H2O)2](2-) (X = Cl(-)/Br(-)) within its dimeric capsular assembly and forms a non-capsular 1D polymeric assembly with higher homologous iodide anions upon protonation.
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Affiliation(s)
- Arghya Basu
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781039, Assam, India
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38
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Structural and Infra Red Spectroscopic Aspects of Ion-Water Clusters: A Study Based on a Combined Stochastic and Quantum Chemical Approach. J CLUST SCI 2013. [DOI: 10.1007/s10876-013-0565-4] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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39
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Wang YC, Ju SP, Lee WJ, Chen HT, Hsieh JY. Effect of Au nanotube size on molecular behavior of water/ethanol mixtures. RSC Adv 2013. [DOI: 10.1039/c3ra22530e] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
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40
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López LA, Barrio P, Borge J. Cationic Copper(I) Carbene Complexes: Synthesis and Structures of a Tricoordinate Copper(I) Carbene Water Complex and a Dicoordinate Carbene Complex. Organometallics 2012. [DOI: 10.1021/om300925w] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Luis A. López
- Instituto Universitario de Quı́mica
Organometálica
“Enrique Moles”, Departamento de Quı́mica
Orgánica e Inorgánica, and ‡Departamento de Quı́mica
Fı́sica y Analítica, Universidad de Oviedo, Julián Clavería
8, 33007-Oviedo, Spain
| | - Pablo Barrio
- Instituto Universitario de Quı́mica
Organometálica
“Enrique Moles”, Departamento de Quı́mica
Orgánica e Inorgánica, and ‡Departamento de Quı́mica
Fı́sica y Analítica, Universidad de Oviedo, Julián Clavería
8, 33007-Oviedo, Spain
| | - Javier Borge
- Instituto Universitario de Quı́mica
Organometálica
“Enrique Moles”, Departamento de Quı́mica
Orgánica e Inorgánica, and ‡Departamento de Quı́mica
Fı́sica y Analítica, Universidad de Oviedo, Julián Clavería
8, 33007-Oviedo, Spain
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41
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Sun D, Liu FJ, Huang RB, Zheng LS. Three guest-dependent nitrate–water aggregations encapsulated in silver(i)–bipyridine supramolecular frameworks. CrystEngComm 2012. [DOI: 10.1039/c2ce26161h] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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