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Ciszewski RK, Gordon BP, Muller BN, Richmond GL. Takes Two to Tango: Choreography of the Coadsorption of CTAB and Hexanol at the Oil-Water Interface. J Phys Chem B 2019; 123:8519-8531. [PMID: 31513405 DOI: 10.1021/acs.jpcb.9b05775] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Mixed surfactant systems at the oil-water interface play a vital role in applications ranging widely from drug delivery to oil-spill remediation. Synergistic mixtures are superior emulsifiers and more effective at modifying surface tension than either component alone. Mixtures of surfactants with dissimilar polar head groups are of particular interest because of the additional degree of control they offer. The interplay of hydrophobic and electrostatic effects in these systems is not well understood, in part because of the difficulty in examining their behavior at the buried oil-water interface where they reside. Here, surface-specific vibrational sum frequency spectroscopy is utilized in combination with surface tensiometry and computational methods to probe the cooperative molecular interactions between a cationic surfactant cetyltrimethylammonium bromide (CTAB) and a nonionic alcohol (1-hexanol) that induce the two initially reluctant surfactants to coadsorb synergistically at the interface. A careful deuteration study of CTAB reveals that hexanol cooperates with CTAB such that both molecules preferentially orient at the interface for sufficiently large enough concentrations of hexanol. This work's methodology is unique and serves as a guide for future explorations of macroscopic properties in these complex systems. Results from this work also provide valuable insights into how interfacial ordering impacts surface tensiometry measurements for nonionic surfactants.
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Affiliation(s)
- Regina K Ciszewski
- Department of Chemistry and Biochemistry , University of Oregon , 1253 University of Oregon , Eugene , Oregon 97403 , United States
| | - Brittany P Gordon
- Department of Chemistry and Biochemistry , University of Oregon , 1253 University of Oregon , Eugene , Oregon 97403 , United States
| | - Benjamin N Muller
- Department of Chemistry and Biochemistry , University of Oregon , 1253 University of Oregon , Eugene , Oregon 97403 , United States
| | - Geraldine L Richmond
- Department of Chemistry and Biochemistry , University of Oregon , 1253 University of Oregon , Eugene , Oregon 97403 , United States
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Khan AM, Shawon J, Halim MA. Multiple receptor conformers based molecular docking study of fluorine enhanced ethionamide with mycobacterium enoyl ACP reductase (InhA). J Mol Graph Model 2017; 77:386-398. [DOI: 10.1016/j.jmgm.2017.09.010] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2017] [Revised: 09/07/2017] [Accepted: 09/09/2017] [Indexed: 01/11/2023]
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Affiliation(s)
- Manh-Thuong Nguyen
- Center
for Computational Physics, Institute of Physics, Vietnam Academy of Science and Technology, 10 Dao Tan Street, Hanoi 100000, Vietnam
| | - Pham Nam Phong
- School
of Engineering Physics, Hanoi University of Science and Technology, Hanoi 100000, Vietnam
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Matczak P. Theoretical analysis of trends in hydrogen bonding involving halogen acceptors (F−At) covalently bonded to a group 14 atom (C−Pb). Mol Phys 2016. [DOI: 10.1080/00268976.2016.1268727] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Piotr Matczak
- Department of Theoretical and Structural Chemistry, Faculty of Chemistry, University of Łódź, Lodz, Poland
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Zerrouki A, Allouchi H, Nicolaï B, El Kadiri S, Bahari Z, Céolin R, Rietveld IB. Crystal structure and thermal expansion of N,N,N′,N′-tetrakis-[(1H,2,4-triazol-1-yl)methyl]-ethane-1,2-diamine. Struct Chem 2016. [DOI: 10.1007/s11224-015-0611-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Astashkin AV, Chen L, Elmore BO, Kunwar D, Miao Y, Li H, Poulos TL, Roman LJ, Feng C. Probing the Hydrogen Bonding of the Ferrous-NO Heme Center of nNOS by Pulsed Electron Paramagnetic Resonance. J Phys Chem A 2015; 119:6641-9. [PMID: 26035438 DOI: 10.1021/acs.jpca.5b01804] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Oxidation of L-arginine (L-Arg) to nitric oxide (NO) by NO synthase (NOS) takes place at the heme active site. It is of current interest to study structures of the heme species that activates O2 and transforms the substrate. The NOS ferrous-NO complex is a close mimic of the obligatory ferric (hydro)peroxo intermediate in NOS catalysis. In this work, pulsed electron-nuclear double resonance (ENDOR) spectroscopy was used to probe the hydrogen bonding of the NO ligand in the ferrous-NO heme center of neuronal NOS (nNOS) without a substrate and with L-Arg or N-hydroxy-L-arginine (NOHA) substrates. Unexpectedly, no H-bonding interaction connecting the NO ligand to the active site water molecule or the Arg substrate was detected, in contrast to the results obtained by X-ray crystallography for the Arg-bound nNOS heme domain [Li et al. J. Biol. Inorg. Chem. 2006, 11, 753-768]. The nearby exchangeable proton in both the no-substrate and Arg-containing nNOS samples is located outside the H-bonding range and, on the basis of the obtained structural constraints, can belong to the active site water (or OH). On the contrary, in the NOHA-bound sample, the nearby exchangeable hydrogen forms an H-bond with the NO ligand (on the basis of its distance from the NO ligand and a nonzero isotropic hfi constant), but it does not belong to the active site water molecule because the water oxygen atom (detected by (17)O ENDOR) is too far. This hydrogen should therefore come from the NOHA substrate, which is in agreement with the X-ray crystallography work [Li et al. Biochemistry 2009, 48, 10246-10254]. The nearby nonexchangeable hydrogen atom assigned as H(ε) of Phe584 was detected in all three samples. This hydrogen atom may have a stabilizing effect on the NO ligand and probably determines its position.
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Affiliation(s)
- Andrei V Astashkin
- †Department of Chemistry and Biochemistry, University of Arizona, Tucson, Arizona 85721, United States
| | - Li Chen
- ‡College of Pharmacy, University of New Mexico, Albuquerque, New Mexico 87131, United States
| | - Bradley O Elmore
- ‡College of Pharmacy, University of New Mexico, Albuquerque, New Mexico 87131, United States
| | - Deepak Kunwar
- ‡College of Pharmacy, University of New Mexico, Albuquerque, New Mexico 87131, United States
| | - Yubin Miao
- ‡College of Pharmacy, University of New Mexico, Albuquerque, New Mexico 87131, United States
| | - Huiying Li
- §Departments of Molecular Biology and Biochemistry, Chemistry, and Pharmaceutical Sciences, University of California, Irvine, Irvine, California 92697-3900, United States
| | - Thomas L Poulos
- §Departments of Molecular Biology and Biochemistry, Chemistry, and Pharmaceutical Sciences, University of California, Irvine, Irvine, California 92697-3900, United States
| | - Linda J Roman
- ∥Department of Biochemistry, University of Texas Health Science Center in San Antonio, San Antonio, Texas 78229, United States
| | - Changjian Feng
- ‡College of Pharmacy, University of New Mexico, Albuquerque, New Mexico 87131, United States
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Hartmann M, Wetmore SD, Radom L. C−H···X Hydrogen Bonds of Acetylene, Ethylene, and Ethane with First- and Second-Row Hydrides. J Phys Chem A 2001. [DOI: 10.1021/jp001672e] [Citation(s) in RCA: 117] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Michael Hartmann
- Research School of Chemistry, Australian National University, Canberra, ACT 0200, Australia
| | - Stacey D. Wetmore
- Research School of Chemistry, Australian National University, Canberra, ACT 0200, Australia
| | - Leo Radom
- Research School of Chemistry, Australian National University, Canberra, ACT 0200, Australia
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Gu Y, Kar T, Scheiner S. Fundamental Properties of the CH···O Interaction: Is It a True Hydrogen Bond? J Am Chem Soc 1999. [DOI: 10.1021/ja991795g] [Citation(s) in RCA: 810] [Impact Index Per Article: 32.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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van Mourik T, van Duijneveldt F. Ab initio calculations on the C-H… O hydrogen-bonded systems CH4-H2O, CH3NH2-H2O and CH3NH3+-H2O. ACTA ACUST UNITED AC 1995. [DOI: 10.1016/0166-1280(95)04208-n] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Chattopadhyay S, Plummer PL. Ab initio studies on the mixed heterodimers of ammonia and hydrogen cyanide. Chem Phys 1994. [DOI: 10.1016/0301-0104(93)e0445-2] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Novel base pairing in nucleic acids: CH donor group mediated base pairing involving 3-methyluracil. ACTA ACUST UNITED AC 1988. [DOI: 10.1016/0166-1280(88)80131-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Wierzejewska Hnat M, Ratajczak H. Matrix isolation infrared studies of trichloromethane-base complexes. J Mol Struct 1988. [DOI: 10.1016/0022-2860(88)80115-7] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Fraser GT, Leopold KR, Nelson DD, Tung A, Klemperer W. The rotational spectrum and structure of NH3–HCN. J Chem Phys 1984. [DOI: 10.1063/1.447119] [Citation(s) in RCA: 86] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Ganin YG, Slmonov YA, Malinovskii TI, Bogat-skii AV, Luk'yanenko NG, Orfeev VS. Crystal structure and conformation of 7,7,16,16-tetraethoxycarbonyl-1,4,10,13-tetraoxacyclooctadecane (tetraethoxycarbonyl-18-crown-4). THEOR EXP CHEM+ 1984. [DOI: 10.1007/bf00517007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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18
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Gay R, Vanderkooi G. Hydrogen bonding of phosphodiesters to water, methanol, and methylamine as studied by the CNDO/2 method. J Chem Phys 1981. [DOI: 10.1063/1.442290] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Latajka Z, Ratajczak H. A study of intermolecular interaction in the polymer of monofluorosilane by the CNDO/2 method. J STRUCT CHEM+ 1979. [DOI: 10.1007/bf00753753] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Birnbaum GI, Shugar D. A purine nucleoside unequivocally constrained in the syn form. Crystal structure and conformation of 8-(alpha-hydroxyisopropyl)-adenosine. BIOCHIMICA ET BIOPHYSICA ACTA 1978; 517:500-10. [PMID: 626748 DOI: 10.1016/0005-2787(78)90216-2] [Citation(s) in RCA: 37] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Crystals of 8-(alpha-hydroxyisopropyl)-adenosine dihydrate, C13H19N5O5.2H2O, belong to the monoclinic space group P21. Cell dimensions are a = 8.259 (1), b = 11.117 (2), c = 9.663 (1) A, beta = 109.65 (2) degrees. Intensity data were collected on a four-circle diffractometer and the structure was solved by direct methods. Block diagonal least-squares refinement led to R = 0.031 for 1467 reflections. The glycosyl torsion angle chiCN is 241.4 degrees, corresponding to a syn conformation. The conformation of the exocyclic C(4')-C(5') bond is gauche-gauche and the sugar pucker is C(2') endo. It is considered that the bulky, tetrahedral, neutral 8-substituent, with an effective van der Waals radius of 3.5--4.0 A, provides an adenosine analogue which should exhibit the syn conformation about the glycosidic bond in solution as well as in solid state, irrespective of the nature of the sugar pucker. It should therefore be suitable for studies of interactions with enzyme systems requiring the anti conformation of the nucleoside or nucleotide.
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Study of the hydrogen bond in the complexes of water with hydrogen sulfide by the CNDO/2 method. J STRUCT CHEM+ 1978. [DOI: 10.1007/bf00753258] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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CNDO/2 molecular orbital calculations on the complexes formed between methyllithium and trimethylaluminium with aliphatic amines. J Organomet Chem 1977. [DOI: 10.1016/s0022-328x(00)84410-1] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Study of complexes of p-chloro- and p-fluorophenol with some p-donors by calorimetry and nmr methods. Russ Chem Bull 1976. [DOI: 10.1007/bf00928081] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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