[Zn3(HCOO)6]: A Porous Diamond Framework Conformable to Guest Inclusion

2006 ◽  
Vol 59 (9) ◽  
pp. 617 ◽  
Author(s):  
Zheming Wang ◽  
Yanjuan Zhang ◽  
Mohamedally Kurmoo ◽  
Tao Liu ◽  
Serge Vilminot ◽  
...  
Keyword(s):  
Thermal Properties ◽  
Hydrogen Bonds ◽  
Inclusion Compounds ◽  
Wide Spectrum ◽  
Diamond Structure ◽  
N2 Adsorption ◽  
Crystal Transformation ◽  
Inclusion Process ◽  
Main Host ◽  
Weak Hydrogen Bonds

We report the syntheses, crystal structures, and the thermal properties of [Zn3(HCOO)6](CH3OH)1.5(H2O)0.5 (1parent), [Zn3(HCOO)6] (2empty), and six guest-inclusion compounds [Zn3(HCOO)6](I2) (3iodine), [Zn3(HCOO)6](C4H8O) (4THF), [Zn3(HCOO)6](C4H4O) (5furan), [Zn3(HCOO)6](C6H6) (6benzene), [Zn3(HCOO)6](CH3CN) (7acetonitrile), and [Zn3(HCOO)6]((CH3)2CO) (8acetone) as well as the H2 and N2 adsorption of 2empty. The frameworks of all the compounds are similar, and consist of Zn-centred ZnZn4 tetrahedral nodes of a distorted diamond structure. It is robust by virtue of the diamond structure and it displays permanent porosity in which the pores, occupying about 30% of the volume, can be reversibly emptied and refilled with solvents and gases without loss of crystallinity. The crystal-to-crystal transformation is assured by performing the guest-inclusion process by exposure of 2empty to the vapours of the guests following the complete desolvation of 1parent. Conformity is evidenced by the change in the lattice parameters proportional to the size of the guests. The framework is thermally stable up to 140°C at which it is transformed exothermically to a more compact form, β-Zn(HCOO)2, that is stable to 270°C. Due to the flexibility and amphiphilic nature of the pores, consisting of both C–H and O arrays at the surface, 2empty can take up a wide spectrum of both polar and non-polar guests of different size. The guests are confined in zig-zag molecular arrays within the channels where weak hydrogen bonds provide the main host–guest interaction. Except for acetonitrile, which sits in the central part of the channels, all the guests appear to line the wall of the channels.

Thermal properties of polybenzoxazine exhibiting improved toughness: Blending with cyclodextrin and its derivatives

2021 ◽  
pp. 095400832110130
Author(s):  
Hailong Li ◽  
Sipei Zhao ◽  
Li Pei ◽  
Zihe Qiao ◽  
Ding Han ◽  
...  
Keyword(s):  
Thermal Properties ◽  
Hydrogen Bonds ◽  
High Performance ◽  
Practical Application ◽  
Scanning Calorimetry ◽  
Thermoset Resins ◽  
Chemical Structures ◽  
Microscopy Techniques ◽  
Fractured Surface ◽  
Scanning Electron

Polybenzoxazines are emerging as a class of high-performance thermoset polymers that can find their applications in various fields. However, its practical application is limited by its low toughness. The cyclic β-cyclodextrin and a newly synthesized derivative (β-cyclodextrin-MAH) were separately blended with benzoxazine to improve the toughness of polybenzoxazine. The results revealed that the maximum impact strength of the blend was 12.24 kJ·m−2 and 14.29 kJ·m−2 when 1 wt.% of β-Cyclodextrin and β-Cyclodextrin-MAH, respectively, were used. The strengths were 53% and 86% higher than that of pure polybenzoxazine. The curing reaction, possible chemical structures, and fractured surface were examined using differential scanning calorimetry, Fourier transform infrared spectroscopy, and scanning electron microscopy techniques to understand the mechanism of generation of toughness. The results revealed that the sea-island structure and the presence of hydrogen bonds between polybenzoxazine and β-cyclodextrin and β-cyclodextrin-MAH resulted in the generation of toughness. Furthermore, the curves generated during thermogravimetric analysis did not significantly change, revealing the good thermal properties of the system. The phase-separated structure and the hydrogen bonds present in the system can be exploited to prepare synergistically tough polybenzoxazine exhibiting excellent thermal properties. This can be a potential way of modifying the thermoset resins.

Raman spectroscopy of weak hydrogen bonds in the liquid phase

1978 ◽  
Vol 47 ◽  
pp. 285-290 ◽  
Author(s):  
J.P. Perchard ◽  
C. Perchard ◽  
A. Burneau ◽  
J. Limouzi
Keyword(s):  
Raman Spectroscopy ◽  
Liquid Phase ◽  
Hydrogen Bonds ◽  
Weak Hydrogen Bonds

scholarly journals Synthetic and crystallographic studies of bicyclo[3.3.1]nonane derivatives: from strong to weak hydrogen bonds and the stereochemistry of network formation

CrystEngComm ◽  
2012 ◽  
Vol 14 (1) ◽  
pp. 178-187 ◽  
Author(s):  
Carl-Johan Wallentin ◽  
Edvinas Orentas ◽  
Magnus T. Johnson ◽  
Nikoletta B. Báthori ◽  
Eugenijus Butkus ◽  
...  
Keyword(s):  
Hydrogen Bonds ◽  
Network Formation ◽  
Weak Hydrogen Bonds

scholarly journals Weak Hydrogen Bonds in Some Six- and Five-atom Interactions: An AIM Topological Analysis

2013 ◽  
Vol 2 (6) ◽  
pp. 343-346 ◽  
Author(s):  
Francisco Sánchez-Viesca ◽  
Fernando Cortés ◽  
Reina Gómez ◽  
Martha Berros
Keyword(s):  
Hydrogen Bonds ◽  
Topological Analysis ◽  
Weak Hydrogen Bonds

scholarly journals catena-Poly[[[bis(acetonitrile-κN)(4,4′-dimethoxy-2,2′-bipyridine-κ2 N,N′)copper(II)]-μ-trifluoromethanesulfonato-κ2 O:O′] trifluoromethanesulfonate]

IUCrData ◽  
2020 ◽  
Vol 5 (10) ◽  
Author(s):  
Rafael A. Adrian ◽  
Diego R. Hernandez ◽  
Hadi D. Arman
Keyword(s):  
Hydrogen Bonds ◽  
Title Compound ◽  
Metal Organic Frameworks ◽  
Starting Material ◽  
Compound A ◽  
Distorted Octahedral ◽  
Weak Hydrogen Bonds ◽  
Polymeric Chains ◽  
Metal Organic ◽  
Bipyridine Ligand

The central copper(II) atom of the title salt, {[Cu(CF3SO3)(CH3CN)2(C12H12N2O2)](CF3SO3)} n or [[Cu(CH3CN)2(diOMe-bpy)(CF3SO3)](CF3SO3)] n where diOMe-bpy is 4,4′-dimethoxy-2,2′-bipyridine, C12H12N2O2, is sixfold coordinated by the N atoms of the chelating bipyridine ligand, the N atoms of two acetonitrile molecules, and two trifluoromethanesulfonate O atoms in a tetragonally distorted octahedral shape. The formation of polymeric chains [Cu(CH3CN)2(diOMe-bpy)(CF3SO3)]+ n leaves voids for the non-coordinating trifluoromethanesulfonate anions that interact with the complex through weak hydrogen bonds. The presence of weakly coordinating ligands like acetonitrile and trifluoromethanesulfonate makes the title compound a convenient starting material for the synthesis of novel metal–organic frameworks.

scholarly journals Amide to amide interactions: from strong to weak hydrogen bonds in bis(quinoxaline-carboxamide) functionality

2011 ◽  
Vol 67 (a1) ◽  
pp. C388-C389
Author(s):  
C. A. Jiménez ◽  
N. Parra ◽  
P. I. Hidalgo ◽  
J. Belmar ◽  
J. Pasán ◽  
...  
Keyword(s):  
Hydrogen Bonds ◽  
Weak Hydrogen Bonds

Chlorido(dimethyl 2,2′-bipyridine-4,4′-dicarboxylate-κ2N,N′)(η5-pentamethylcyclopentadienyl)rhodium(III) chloride 1-hydroxypyrrolidine-2,5-dione disolvate

2013 ◽  
Vol 69 (6) ◽  
pp. 584-587
Author(s):  
Dharmalingam Sivanesan ◽  
Hyung Min Kim ◽  
Yoon Sungho
Keyword(s):  
Hydrogen Bonding ◽  
Hydrogen Bonds ◽  
Substitution Reaction ◽  
Three Dimensional ◽  
Title Complex ◽  
Rhodium Complex ◽  
Synthetic Route ◽  
Dimensional Network ◽  
Weak Hydrogen Bonds ◽  
Solvent Molecules

The title complex, [Rh(C10H15)Cl(C14H12N2O4)]Cl·2C4H5NO3, has been synthesized by a substitution reaction of the precursor [bis(2,5-dioxopyrrolidin-1-yl) 2,2′-bipyridine-4,4′-dicarboxylate]chlorido(pentamethylcyclopentadienyl)rhodium(III) chloride with NaOCH3. The RhIIIcation is located in an RhC5N2Cl eight-coordinated environment. In the crystal, 1-hydroxypyrrolidine-2,5-dione (NHS) solvent molecules form strong hydrogen bonds with the Cl−counter-anions in the lattice and weak hydrogen bonds with the pentamethylcyclopentadienyl (Cp*) ligands. Hydrogen bonding between the Cp* ligands, the NHS solvent molecules and the Cl−counter-anions form links in a V-shaped chain of RhIIIcomplex cations along thecaxis. Weak hydrogen bonds between the dimethyl 2,2′-bipyridine-4,4′-dicarboxylate ligands and the Cl−counter-anions connect the components into a supramolecular three-dimensional network. The synthetic route to the dimethyl 2,2′-bipyridine-4,4′-dicarboxylate-containing rhodium complex from the [bis(2,5-dioxopyrrolidin-1-yl) 2,2′-bipyridine-4,4′-dicarboxylate]rhodium(III) precursor may be applied to link Rh catalysts to the surface of electrodes.

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