Room‐temperature self-healable and stretchable waterborne polyurethane film fabricated via multiple hydrogen bonds

2021 ◽  
Vol 151 ◽  
pp. 106081
Author(s):  
Huayun Peng ◽  
Xiaosheng Du ◽  
Xu Cheng ◽  
Haibo Wang ◽  
Zongliang Du
Keyword(s):  
Hydrogen Bonds ◽  
Room Temperature ◽  
Waterborne Polyurethane ◽  
Polyurethane Film ◽  
Multiple Hydrogen Bonds

Infrared spectra of the ammonium ion in crystals. Part VIII. Spectroscopic criteria of highly-bent hydrogen bonds

1980 ◽  
Vol 58 (9) ◽  
pp. 867-874 ◽  
Author(s):  
Osvald Knop ◽  
Wolfgang J. Westerhaus ◽  
Michael Falk
Keyword(s):  
Low Temperature ◽  
Hydrogen Bonds ◽  
Infrared Spectra ◽  
Room Temperature ◽  
Ammonium Ion ◽  
Temperature Transition ◽  
Increasing Temperature

Available evidence suggests that (1) the stretching frequencies of highly-bent hydrogen bonds decrease with increasing temperature, regardless of whether the bonds are static or dynamic in character, to a single acceptor or to several competing acceptors; and (2) departures from symmetric trifurcation (or bifurcation) toward asymmetric situations lower the stretching frequency. In further support of these criteria isotopic probe ion spectra between 10 K and room temperature have been obtained for taurine and for trigonal (NH4)2MF6 (M = Si, Ge, Sn, Ti). Evidence of a low-temperature transition at 100(10) K in trigonal (NH4)2SnF6 is presented, and existence of the previously reported transition at 38.6 K in trigonal (NH4)2SiF6 is confirmed. Symmetry changes associated with these transitions are discussed.

scholarly journals Crystal structure of the new hybrid material bis(1,4-diazoniabicyclo[2.2.2]octane) di-μ-chlorido-bis[tetrachloridobismuthate(III)] dihydrate

2015 ◽  
Vol 71 (11) ◽  
pp. 1384-1387
Author(s):  
Marwen Chouri ◽  
Habib Boughzala
Keyword(s):  
Crystal Structure ◽  
Aqueous Solution ◽  
Hydrogen Bonds ◽  
Room Temperature ◽  
Molar Ratio ◽  
Water Molecules ◽  
Site Symmetry ◽  
Two Dimensional ◽  
Slow Evaporation ◽  
Solution Ph

The title compound bis(1,4-diazoniabicyclo[2.2.2]octane) di-μ-chlorido-bis[tetrachloridobismuthate(III)] dihydrate, (C6H14N2)2[Bi2Cl10]·2H2O, was obtained by slow evaporation at room temperature of a hydrochloric aqueous solution (pH = 1) containing bismuth(III) nitrate and 1,4-diazabicyclo[2.2.2]octane (DABCO) in a 1:2 molar ratio. The structure displays a two-dimensional arrangement parallel to (100) of isolated [Bi2Cl10]4−bioctahedra (site symmetry -1) separated by layers of organic 1,4-diazoniabicyclo[2.2.2]octane dications [(DABCOH2)2+] and water molecules. O—H...Cl, N—H...O and N—H...Cl hydrogen bonds lead to additional cohesion of the structure.

scholarly journals Towards understanding of delignification of grassy and woody biomass in cholinium-based ionic liquids

2021 ◽  
Author(s):  
Mood Mohan ◽  
Hemant Choudhary ◽  
Anthe George ◽  
Blake A. Simmons ◽  
Kenneth Sale ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Ionic Liquids ◽  
Hydrogen Bonds ◽  
Molecular Dynamics Simulations ◽  
Woody Biomass ◽  
Dissolution Mechanism ◽  
Dynamics Simulations ◽  
Multiple Hydrogen Bonds

Herein we report the dissolution mechanism of lignin in cholinium-based ionic liquids by molecular dynamics simulations. Multiple hydrogen bonds, longer HB lifetimes, and higher pKa of [Ch][Lys] makes it a better solvent for lignin than acidic ILs.

Das Kombinationsschwingungsspektrum von Gips im Bereich von 10 000—1200 cm-1

1968 ◽  
Vol 23 (5) ◽  
pp. 708-715 ◽  
Author(s):  
V. Hohler ◽  
H. D. Lutz
Keyword(s):  
Hydrogen Bonds ◽  
Ir Spectrum ◽  
Room Temperature ◽  
Polarized Light ◽  
Water Molecules ◽  
Lattice Vibrations ◽  
Frequency Range ◽  
Sulfate Ions ◽  
Normal Vibrations

The IR-spectrum of gypsum (CaSO4·2 H2O) in the frequency range from 10 000 to 1200 cm-1 has been investigated with polarized light at room temperature. Between 3700 and 1200 cm-1, the measurements confirm the data of HASS and SUTHERLAND and as well as those of SCHAAK derived from IR and reflection measurements. The IR-spectrum shows a great number of bands, most of which can be assigned to combination and fundamental vibrations in terms of normal vibrations of the water molecules and the sulfate ions. The influence of the lattice vibrations is briefly discussed. The existence of hydrogen bonds between the water molecules and the sulfate ions gives rise to combinations of fundamental vibrations of both complexes.

Multiple Hydrogen Bonds Promoted ESIPT and AIE-active Chiral Salicylaldehyde Hydrazide

2018 ◽  
Vol 36 (8) ◽  
pp. 698-707 ◽  
Author(s):  
Man Wang ◽  
Caiqi Cheng ◽  
Jintong Song ◽  
Jun Wang ◽  
Xiangge Zhou ◽  
...  
Keyword(s):  
Hydrogen Bonds ◽  
Multiple Hydrogen Bonds

A DFT study of RuO4 interactions with porous materials: metal–organic frameworks (MOFs) and zeolites

2018 ◽  
Vol 20 (24) ◽  
pp. 16770-16776 ◽  
Author(s):  
Siwar Chibani ◽  
Michael Badawi ◽  
Thierry Loiseau ◽  
Christophe Volkringer ◽  
Laurent Cantrel ◽  
...  
Keyword(s):  
Hydrogen Bonds ◽  
Porous Materials ◽  
Metal Organic Frameworks ◽  
Dft Study ◽  
Hydrated Form ◽  
Metal Organic ◽  
First Time ◽  
Potential Use ◽  
Multiple Hydrogen Bonds

The potential use of zeolite and MOF materials for the capture of RuO4 has been investigated for the first time. A hydrated form of HKUST-1 could be a promising sorbent due to its ability to form multiple hydrogen bonds.

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