Unconventional ionic hydrogen bonds. 2. NH+.cntdot..cntdot..cntdot..pi.. Complexes of onium ions with olefins and benzene derivatives

1985 ◽  
Vol 107 (2) ◽  
pp. 474-479 ◽  
Author(s):  
Michael Meot-Ner ◽  
Carol A. Deakyne
Keyword(s):  
Hydrogen Bonds ◽  
Benzene Derivatives ◽  
Pi Complexes ◽  
Ionic Hydrogen Bonds

Hydroxyl Ionic Liquids: The Differentiating Effect of Hydroxyl on Polarity due to Ionic Hydrogen Bonds between Hydroxyl and Anions

2010 ◽  
Vol 114 (11) ◽  
pp. 3912-3920 ◽  
Author(s):  
Shiguo Zhang ◽  
Xiujuan Qi ◽  
Xiangyuan Ma ◽  
Liujin Lu ◽  
Youquan Deng
Keyword(s):  
Ionic Liquids ◽  
Hydrogen Bonds ◽  
Ionic Hydrogen Bonds

THERMOREVERSIBLE CROSS-LINKING MALEIC ANHYDRIDE GRAFTED CHLOROBUTYL RUBBER WITH HYDROGEN BONDS (COMBINED WITH IONIC INTERACTIONS)

2014 ◽  
Vol 87 (3) ◽  
pp. 459-470 ◽  
Author(s):  
Lin Li ◽  
Jin Kuk Kim
Keyword(s):  
Hydrogen Bonds ◽  
Maleic Anhydride ◽  
Ionic Interactions ◽  
Cross Linking ◽  
External Energy ◽  
Scanning Calorimetry ◽  
Ionic Bonds ◽  
Cross Links ◽  
Ionic Hydrogen Bonds ◽  
Chlorobutyl Rubber

ABSTRACT Thermoreversible cross-linking polymers are designed based on reversible cross-linking bonds. These bonds are able to reversibly dissociate and associate upon the input of external energy, such as heat or light. Reprocessibility is possible for this kind of material. The objective was to thermoreversibly cross-link maleic anhydride grafted chlorobutyl rubber (MAH-g-CIIR) via a reaction with octadecylamine, with an excess to obtain amide-salts, which form both hydrogen bonds and ionic interactions. X-ray diffraction experiments showed the presence of microphase-separated aggregates that acted as physical cross-links for both the MAH-g-CIIR precursor and amide-salts. The tensile properties were improved by converting MAH-g-CIIR to amide-salts, because of the combination of hydrogen bonding and ionic interactions. The cross-linked materials could be repeatedly compression molded at 155 °C into homogeneous films. The differential scanning calorimetry curves and Fourier transform infrared spectra indicate that hydrogen bonds are of a thermoreversible nature, but the recovery of ionic bonds is impossible. After treatment with heating-cooling for up to three cycles, the tensile strength of the thermoreversible cross-linking CIIR was greatly reduced. The gradual reduction in the effectiveness of the ionic-hydrogen bonds is the major contribution to the reprocessibility of these materials.

Characterization of Doubly Ionic Hydrogen Bonds in Protic Ionic Liquids by NMR Deuteron Quadrupole Coupling Constants: Differences to H-bonds in Amides, Peptides, and Proteins

2017 ◽  
Vol 56 (45) ◽  
pp. 14310-14314 ◽  
Author(s):  
Alexander E. Khudozhitkov ◽  
Peter Stange ◽  
Benjamin Golub ◽  
Dietmar Paschek ◽  
Alexander G. Stepanov ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Hydrogen Bonds ◽  
Coupling Constants ◽  
Protic Ionic Liquids ◽  
Quadrupole Coupling ◽  
Ionic Hydrogen Bonds

X-Ray Structure Determinations of Bromo- and/or Bromomethylsubstituted Benzenes: C–H···Br, C–Br···Br, and C–Br···π Interactions

2012 ◽  
Vol 67 (12) ◽  
pp. 1273-1281 ◽  
Author(s):  
Peter G. Jones ◽  
Piotr Kuś ◽  
Ina Dix
Keyword(s):  
Hydrogen Bonds ◽  
Three Dimensional ◽  
Benzene Derivatives ◽  
Chemical Similarity ◽  
X Ray ◽  
Π Interactions ◽  
Layer Structures ◽  
Structure Determinations ◽  
Subordinate Role

The structures of seven benzene derivatives [1,2,3-tri(bromomethyl)benzene, (1); 3,5- di(bromomethyl)bromobenzene, (2); 2,5-di(bromomethyl)bromobenzene, (3); 4-(bromomethyl)-2,5- dibromotoluene, (4); 4-(bromomethyl)bromobenzene, (5); 2,3-di(bromomethyl)bromobenzene, (6) and (bromomethyl)-p-dibromobenzene, (7)] with bromo and bromomethyl (and in one case methyl) substituents are presented and analysed in terms of Br···Br interactions up to 4.0 A° , supported by hydrogen bonds H···Br. Some interactions of the type Br···π and π···π are encountered and play a subordinate role in the packing. Despite the close chemical similarity of the compounds, some of which are isomers with permuted substituent positions, the packing motifs are highly variable. Compounds 2-5 are based on layer structures with Brn (n=3, 4) and/or mixed Br/C rings. Compounds 1, 6 and 7 display three-dimensional packings of differing complexity, but with interpretable substructures; 1 can be analysed in terms of ribbons of linked Br3 and Br4 rings; 6 displays chains of linked Br3 triangles; 7 consists of ribbons of linked Br4 quadrilaterals.

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