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Consulta la lista di attuali articoli, libri, tesi, atti di convegni e altre fonti scientifiche attinenti al tema "Hydrogen bonding".
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Breugst, Martin, Daniel von der Heiden e Julie Schmauck. "Novel Noncovalent Interactions in Catalysis: A Focus on Halogen, Chalcogen, and Anion-π Bonding". Synthesis 49, n. 15 (23 maggio 2017): 3224–36. http://dx.doi.org/10.1055/s-0036-1588838.
Noncovalent interactions play an important role in many biological and chemical processes. Among these, hydrogen bonding is very well studied and is already routinely used in organocatalysis. This Short Review focuses on three other types of promising noncovalent interactions. Halogen bonding, chalcogen bonding, and anion-π bonding have been introduced into organocatalysis in the last few years and could become important alternate modes of activation to hydrogen bonding in the future.1 Introduction2 Halogen Bonding3 Chalcogen Bonding4 Anion-π Bonding5 Conclusions
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Wang, Xinyu, Huiyuan Wang, Hongmin Zhang, Tianxi Yang, Bin Zhao e Juan Yan. "Investigation of the Impact of Hydrogen Bonding Degree in Long Single-Stranded DNA (ssDNA) Generated with Dual Rolling Circle Amplification (RCA) on the Preparation and Performance of DNA Hydrogels". Biosensors 13, n. 7 (23 luglio 2023): 755. http://dx.doi.org/10.3390/bios13070755.
DNA hydrogels have gained significant attention in recent years as one of the most promising functional polymer materials. To broaden their applications, it is critical to develop efficient methods for the preparation of bulk-scale DNA hydrogels with adjustable mechanical properties. Herein, we introduce a straightforward and efficient molecular design approach to producing physically pure DNA hydrogel and controlling its mechanical properties by adjusting the degree of hydrogen bonding in ultralong single-stranded DNA (ssDNA) precursors, which were generated using a dual rolling circle amplification (RCA)-based strategy. The effect of hydrogen bonding degree on the performance of DNA hydrogels was thoroughly investigated by analyzing the preparation process, morphology, rheology, microstructure, and entrapment efficiency of the hydrogels for Au nanoparticles (AuNPs)–BSA. Our results demonstrate that DNA hydrogels can be formed at 25 °C with simple vortex mixing in less than 10 s. The experimental results also indicate that a higher degree of hydrogen bonding in the precursor DNA resulted in stronger internal interaction forces, a more complex internal network of the hydrogel, a denser hydrogel, improved mechanical properties, and enhanced entrapment efficiency. This study intuitively demonstrates the effect of hydrogen bonding on the preparation and properties of DNA hydrogels. The method and results presented in this study are of great significance for improving the synthesis efficiency and economy of DNA hydrogels, enhancing and adjusting the overall quality and performance of the hydrogel, and expanding the application field of DNA hydrogels.
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Li, Zhangkang, Cheng Yu, Hitendra Kumar, Xiao He, Qingye Lu, Huiyu Bai, Keekyoung Kim e Jinguang Hu. "The Effect of Crosslinking Degree of Hydrogels on Hydrogel Adhesion". Gels 8, n. 10 (21 ottobre 2022): 682. http://dx.doi.org/10.3390/gels8100682.
The development of adhesive hydrogel materials has brought numerous advances to biomedical engineering. Hydrogel adhesion has drawn much attention in research and applications. In this paper, the study of hydrogel adhesion is no longer limited to the surface of hydrogels. Here, the effect of the internal crosslinking degree of hydrogels prepared by different methods on hydrogel adhesion was explored to find the generality. The results show that with the increase in crosslinking degree, the hydrogel adhesion decreased significantly due to the limitation of segment mobility. Moreover, two simple strategies to improve hydrogel adhesion generated by hydrogen bonding were proposed. One was to keep the functional groups used for hydrogel adhesion and the other was to enhance the flexibility of polymer chains that make up hydrogels. We hope this study can provide another approach for improving the hydrogel adhesion generated by hydrogen bonding.
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Dai, Bailin, Ting Cui, Yue Xu, Shaoji Wu, Youwei Li, Wu Wang, Sihua Liu, Jianxin Tang e Li Tang. "Smart Antifreeze Hydrogels with Abundant Hydrogen Bonding for Conductive Flexible Sensors". Gels 8, n. 6 (13 giugno 2022): 374. http://dx.doi.org/10.3390/gels8060374.
Recently, flexible sensors based on conductive hydrogels have been widely used in human health monitoring, human movement detection and soft robotics due to their excellent flexibility, high water content, good biocompatibility. However, traditional conductive hydrogels tend to freeze and lose their flexibility at low temperature, which greatly limits their application in a low temperature environment. Herein, according to the mechanism that multi−hydrogen bonds can inhibit ice crystal formation by forming hydrogen bonds with water molecules, we used butanediol (BD) and N−hydroxyethyl acrylamide (HEAA) monomer with a multi−hydrogen bond structure to construct LiCl/p(HEAA−co−BD) conductive hydrogel with antifreeze property. The results indicated that the prepared LiCl/p(HEAA−co−BD) conductive hydrogel showed excellent antifreeze property with a low freeze point of −85.6 °C. Therefore, even at −40 °C, the hydrogel can still stretch up to 400% with a tensile stress of ~450 KPa. Moreover, the hydrogel exhibited repeatable adhesion property (~30 KPa), which was attributed to the existence of multiple hydrogen bonds. Furthermore, a simple flexible sensor was fabricated by using LiCl/p(HEAA−co−BD) conductive hydrogel to detect compression and stretching responses. The sensor had excellent sensitivity and could monitor human body movement.
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Faust, Bruce C. "Hydrogen Bonding". Science 258, n. 5081 (16 ottobre 1992): 381. http://dx.doi.org/10.1126/science.258.5081.381.c.
Abraham, Michael H., Gary S. Whiting, Jenik Andonian-Haftvan, Jonathan W. Steed e Jay W. Grate. "Hydrogen bonding". Journal of Chromatography A 588, n. 1-2 (dicembre 1991): 361–0364. http://dx.doi.org/10.1016/0021-9673(91)85048-k.
Abraham, Michael H., Gary S. Whiting, Ruth M. Doherty e Wendel J. Shuely. "Hydrogen bonding". Journal of Chromatography A 587, n. 2 (dicembre 1991): 213–28. http://dx.doi.org/10.1016/0021-9673(91)85158-c.
Abraham, Michael H., Gary S. Whiting, Ruth M. Doherty e Wendel J. Shuely. "Hydrogen bonding". Journal of Chromatography A 587, n. 2 (dicembre 1991): 229–36. http://dx.doi.org/10.1016/0021-9673(91)85159-d.
Abraham, Michael H., e Gary S. Whiting. "Hydrogen bonding". Journal of Chromatography A 594, n. 1-2 (marzo 1992): 229–41. http://dx.doi.org/10.1016/0021-9673(92)80335-r.
Mitchell, John Blayney Owen. "Theoretical studies of hydrogen bonding". Thesis, University of Cambridge, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.358697.
This thesis deals with wider application and implications of the hydrogen bond in crystal engineering studies and beyond; in addition, it also highlights the Cambridge Structural Database (CSD) as the potential knowledge-mine for inorganic chemists. The content of this thesis covers mainly three areas, viz, the role of hydrogen bonding in crystal engineering studies, the bridging between mainstream crystal engineering studies and solvates via hydrogen bond, and CSD studies on metal coordination spheres. Chapter 2 deals with crystal structure prediction through understanding the driving forces for forming supramolecular synthons and some rare supramolecular networks (Carbomndum III). With the help of a series of supraminols we attempt to identify the underlying reason for forming P-As networks. Chapter 3 covers the much debated topic of acceptor capabilities of organic halogens and consequently, how the so-called illusory hydrogen bond involving an organic halogen as an acceptor can explain a complex topic like synthon change-over, in a perfectly comprehensible manner. The aim of the Chapters 4 to 6 is to bring two separate fields, "crystal engineering" and "solvates" closer via a common root, like hydrogen bonding. The serendipitous host molecules are part of our crystal engineering studies, yet they form solvates due to less than optimum hydrogen bonding in their respective crystal structures. Alongside some usual solvates, in an unconventional way, different amines with varying steric, strain and donor hydrogen atoms were used. Different geometrical as well as crystallographical aspects and their explicit role in synthon selection has also been discussed. In Chapter 7, geometrical distortions of three-coordinate metal complexes in the crystal structures in the CSD have been analysed using symmetry modified Principal Component Analysis (PCA). Results shows that 90% of three coordinate species are accounted for by the five elements Cu, Ag, Hg, Au and Zn. Among the three major types of geometries, trigonal planar dominates the data sets, with smaller contribution for Y- and T-shaped structure. For Hg complexes, a possible reaction pathway for ligand addition reaction to two-coordinate linear complexes via T-shaped geometries leading to trigonal planar is discussed in detail. The background information and an overview of the experiments are discussed in the Introductory Chapter.
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Sagar, Rajeeve. "Self-assembly via hydrogen bonding". Thesis, University of Warwick, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.247352.
Scott, Tianeka S. "Understanding Hydrogen Bonding in Photoenolization". University of Cincinnati / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1378196534.
Howard, Daryl L., e n/a. "Hydrogen bonding in the near infrared". University of Otago. Department of Chemistry, 2006. http://adt.otago.ac.nz./public/adt-NZDU20060823.150321.
OH-stretching spectra of various vapour phase species were recorded to investigate hydrogen bonding. The species studied include 1,2-ethanediol, 1,3-propanediol, 1,4-butanediol, acetylacetone, hexafluoroacetylacetone and the complex formed in the heterogeneous mixture of methanol and trimethylamine. The spectra range from the infrared, near infrared to visible wavelengths. The main focus of this study is in the near infrared region, in which the OH-stretching overtones are dominant.
The near infrared and visible spectrum of formic acid has been recorded to investigate coupling across bonds, specifically a resonance occurring between OH- and CH-stretching vibrations. The same resonance was also observed in the spectrum of 1,2-ethanediol. The spectra of deuterated isotopomers of formic acid and 1,2-ethanediol were recorded to experimentally verify the resonance.
The inherently weak nature of the vibrational overtone transitions required sensitive spectroscopic techniques to observe the spectra. The spectra were recorded with conventional long path length absorption spectroscopy and intracavity laser photoacoustic spectroscopy.
Anharmonic oscillator local mode calculations of the OH-stretching transitions were performed to simulate the observed spectra. These calculations require calculation of potential energy surfaces and dipole moment functions. Simulated spectra obtained with highly correlated ab initio methods and large basis sets have yielded the best agreement with observation.
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Biemond, Gerard Jan Eduard. "Hydrogen bonding in segmented block copolymers". Enschede : University of Twente, 2006. http://doc.utwente.nl/51102.
Taylor, Russell Alan. "Hydrogen bonding effects in homogeneous catalysis". Thesis, Imperial College London, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.500138.
When multiple hydrogen bonds lie in-plane and parallel to each other in close proximity, they experience additional positive or negative secondary electrostatic interactions. When a pair of molecules are arranged such that every hydrogen bond acceptor is on one molecule and every hydrogen bond donor is on another, the positive secondary electrostatic interactions are maximised, and thus the association constant of the complex is enhanced. This thesis will present the development of a family of quadruple hydrogen bonded complexes containing only positive secondary interactions, which confers unprecedented stability. The complexes are sufficiently stable to maintain strong binding in polar solvents such as acetonitrile and can be switched “on” and “off” with acid and base. They will be developed into synthons for acid-base responsive supramolecular recognition, for use in stimuli-responsive supramolecular polymers and gelators.
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Locke, Christopher John. "Competitive hydrogen bonding in polymeric systems". Thesis, University of York, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.259805.
Hayward, Owen David. "Hydrogen bonding in the crystalline state". Thesis, University of Bristol, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.391181.
1943-, Bellissent-Funel M. C., Dore John C e NATO Advanced Research Workshop on Hydrogen Bond Networks (1993 : Cargèse, France), a cura di. Hydrogen bond networks. Dordrecht: Kluwer Academic Publishers, 1994.
Jeffrey, George A., e Wolfram Saenger. Hydrogen Bonding in Biological Structures. Berlin, Heidelberg: Springer Berlin Heidelberg, 1991. http://dx.doi.org/10.1007/978-3-642-85135-3.
Chen, Chang-Hwei. "Deuterium Bonding Versus Hydrogen Bonding". In Deuterium Oxide and Deuteration in Biosciences, 29–42. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-08605-2_3.
Huyskens, P. L., e G. G. Siegel. "Hydrogen Bonding and Entropy". In Intermolecular Forces, 397–408. Berlin, Heidelberg: Springer Berlin Heidelberg, 1991. http://dx.doi.org/10.1007/978-3-642-76260-4_17.
Vilar, Ramón. "Hydrogen-Bonding Templated Assemblies". In Supramolecular Assembly via Hydrogen Bonds II, 85–137. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/b14141.
Todres, Zory Vlad. "Effects of Hydrogen Bonding". In Organic Chemistry in Confining Media, 89–102. Heidelberg: Springer International Publishing, 2013. http://dx.doi.org/10.1007/978-3-319-00158-6_4.
Jeffrey, George A., e Wolfram Saenger. "Hydrogen Bonding in Carbohydrates". In Hydrogen Bonding in Biological Structures, 169–219. Berlin, Heidelberg: Springer Berlin Heidelberg, 1994. http://dx.doi.org/10.1007/978-3-642-85135-3_13.
Jeffrey, George A., e Wolfram Saenger. "Hydrogen Bonding in Proteins". In Hydrogen Bonding in Biological Structures, 351–93. Berlin, Heidelberg: Springer Berlin Heidelberg, 1994. http://dx.doi.org/10.1007/978-3-642-85135-3_19.
Hawthorne, F. C., e W. H. Baur. "Hydrogen Bonding in Minerals". In Advanced Mineralogy, 340–47. Berlin, Heidelberg: Springer Berlin Heidelberg, 1994. http://dx.doi.org/10.1007/978-3-642-78523-8_23.
Kasai, Paul H. "Hydrogen Bonding in Disk Lubricants". In 2006 Asia-Pacific Magnetic Recording Conference. IEEE, 2006. http://dx.doi.org/10.1109/apmrc.2006.365901.
Dilshard, Rahima, John R. Dixon, William O. George, Robert A. Lewis, Brian Minty e Roger Upton. "Molecular modeling of hydrogen bonding interactions". In Fourier Transform Spectroscopy: Ninth International Conference, a cura di John E. Bertie e Hal Wieser. SPIE, 1994. http://dx.doi.org/10.1117/12.166742.
Ilgen, Anastasia, Jeffery A. Greathouse, Ward Thompson e Hasini Senanayake. "Hydrogen-bonding networks in nanoconfined water". In Goldschmidt2022. France: European Association of Geochemistry, 2022. http://dx.doi.org/10.46427/gold2022.9797.
Rusev, Rostislav. "Hydrogen bonding network as a logic gate". In 2017 XXVI International Scientific Conference "Electronics" (ET). IEEE, 2017. http://dx.doi.org/10.1109/et.2017.8124383.
Pohl, Radek, Lenka Poštová Slavětínská e Dominik Rejman. "Pyrrolidine nucleotides conformationally constrained via hydrogen bonding". In XVIth Symposium on Chemistry of Nucleic Acid Components. Prague: Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, 2014. http://dx.doi.org/10.1135/css201414352.
Arrivo, S. M., T. P. Dougherty, W. T. Grubbs e E. J. Heilweil. "New Advances in Measuring Hydrogen Bonding Dynamics". In International Conference on Ultrafast Phenomena. Washington, D.C.: Optica Publishing Group, 1996. http://dx.doi.org/10.1364/up.1996.tha.3.
We report the only known comprehensive study of conserved vibrational energy transfer during association and dissociation of biologically relevant hydrogen-bonded complexes in dilute (0.1 M acid) room temperature solution. Newly applied picosecond infrared techniques which vibrationally tag and probe interacting proton donating (-OH, -NH) and accepting (e.g., -C = O, ≡ON) constituents will be presented. From these measurements, details of steric interactions, equilibrium reaction rates and unexpected vibrational excitation transfer during hydrogen-bond formation are revealed for the first time.
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King, John, e Kevin Kubarych. "Solvent Dependent Spectral Diffusion in Hydrogen Bonding Environments". In International Conference on Ultrafast Phenomena. Washington, D.C.: OSA, 2010. http://dx.doi.org/10.1364/up.2010.the17.
Medcraft, Chris, Nick Walker, Anthony Legon e Yannick Geboes. "HALOGEN BONDING VS HYDROGEN BONDING IN CHF2I COMPLEXES WITH NH3 AND N(CH3)3". In 71st International Symposium on Molecular Spectroscopy. Urbana, Illinois: University of Illinois at Urbana-Champaign, 2016. http://dx.doi.org/10.15278/isms.2016.wf02.
Laib, Jonathan P., e Daniel M. Mittleman. "Terahertz absorption in non-polar, non-hydrogen-bonding liquids". In Conference on Lasers and Electro-Optics. Washington, D.C.: OSA, 2009. http://dx.doi.org/10.1364/cleo.2009.cmt4.
Rapporti di organizzazioni sul tema "Hydrogen bonding":
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Zhou, Xu, Hunaid Nulwala, Hyung Kim e Shiaoguo Chen. Universal Solvent Viscosity Reduction via Hydrogen Bonding Disruptors. Office of Scientific and Technical Information (OSTI), giugno 2022. http://dx.doi.org/10.2172/1873907.
Wendlandt, Johanna. Study of Hydrogen Bonding in Small Water Clusters with Density Functional Theory Calculations. Office of Scientific and Technical Information (OSTI), dicembre 2005. http://dx.doi.org/10.2172/877463.
Roberds, B. E., K. D. Choquette, K. M. Geib, S. H. Kravitz, R. D. Twesten e S. N. Farrens. Wafer bonding of GaAs, InP, and Si annealed without hydrogen for advanced device technologies. Office of Scientific and Technical Information (OSTI), ottobre 1997. http://dx.doi.org/10.2172/634098.
Wei, Jing-Fong. Determination of the effect of various hydrogen bonding functionalities on the viscosity of coal liquids. Office of Scientific and Technical Information (OSTI), novembre 1990. http://dx.doi.org/10.2172/6203549.
Gragson, D. E., e G. L. Richmond. Investigations of the Structure and Hydrogen Bonding of Water Molecules at Liquid Surfaces by Vibrational Sum Frequency Spectroscopy. Fort Belvoir, VA: Defense Technical Information Center, giugno 1998. http://dx.doi.org/10.21236/ada347409.
Craven, S., D. Kramer e W. Moddeman. Chemistry of glass-ceramic to metal bonding for header applications: 2. Hydrogen bubble formation during glass-ceramic to metal sealing. Office of Scientific and Technical Information (OSTI), dicembre 1986. http://dx.doi.org/10.2172/6963554.
Gragson, D. E., e G. L. Richmond. Probing the Intermolecular Hydrogen Bonding of Water Molecules at the CCl sub 4 Water Interface in the Presence of Charged Soluble Surfactant. Fort Belvoir, VA: Defense Technical Information Center, giugno 1998. http://dx.doi.org/10.21236/ada347139.
Gao, Q., e J. C. Hemminger. A Vibrational Spectroscopy Study of CH3COOH, CH3COOD and (13)CD3COOH(D) Adsorption on Pt(111). 1. Surface Dimer Formation and Hydrogen Bonding. Fort Belvoir, VA: Defense Technical Information Center, giugno 1991. http://dx.doi.org/10.21236/ada237240.
Gao, Quanyin, e John C. Hemminger. A Vibrational Spectroscopy Study of Ch3COOH, CH3COOD and (13)CD3COOH(D) Adsorption on Pt (111): 1. Surface Dimer Formation and Hydrogen Bonding. Fort Belvoir, VA: Defense Technical Information Center, giugno 1991. http://dx.doi.org/10.21236/ada237284.
Kubas, G. J., J. Eckert e X. L. Luo. Binding of hydrocarbons and other extremely weak ligands to transition metal complexes that coordinate hydrogen: Investigation of cis-interactions and delocalized bonding involving sigma bonds. Office of Scientific and Technical Information (OSTI), luglio 1997. http://dx.doi.org/10.2172/505275.
