scholarly journals On the origin of the great rigidity of self-assembled diphenylalanine nanotubes

2016 ◽  
Vol 18 (43) ◽  
pp. 29681-29685 ◽  
Author(s):  
Pavel Zelenovskiy ◽  
Igor Kornev ◽  
Semen Vasilev ◽  
Andrei Kholkin
Keyword(s):  
Hydrogen Bonds ◽  
Self Assembled

The great rigidity of self-assembled diphenylalanine nanotubes is due to the hydrogen bonds existing between monomers and water in the nanochannel.

Synthesis and Crystal Structure of [(CH2)6N4CH3]2[CoCl4]

2002 ◽  
Vol 55 (9) ◽  
pp. 561 ◽  
Author(s):  
W. Li ◽  
S.-L. Zheng ◽  
C.-R. Zhu ◽  
Y.-X. Tong ◽  
X.-M. Chen
Keyword(s):  
Crystal Structure ◽  
Nitrogen Atom ◽  
Hydrogen Bonds ◽  
Three Dimensional ◽  
Title Complex ◽  
Chlorine Atoms ◽  
Synthesis And Crystal Structure ◽  
Methylene Groups ◽  
Self Assembled ◽  
Hydrogen Bonded

The interesting three-dimensional hydrogen-bonded self-assembled network of [(CH2)6N4CH3]+ cations and [CoCl4]2– anions has been prepared and structurally characterized. In the title complex, the quaternization of one hexamethylenetetramine nitrogen atom has been trapped, and further stabilized by the large [CoCl4]2– anions, featuring C–H���Cl hydrogen bonds (3.497–3.709 �) between the methylene groups of [(CH2)6N4CH3]+ cations and the chlorine atoms of the [CoCl4]2– anions.

scholarly journals 3-Carboxyphenylboronic acid–theophylline (1/1)

2012 ◽  
Vol 68 (8) ◽  
pp. o2320-o2320 ◽  
Author(s):  
Ventsi Dyulgerov ◽  
Rositsa P. Nikolova ◽  
Louiza T. Dimova ◽  
Boris L. Shivachev
Keyword(s):  
Hydrogen Bonds ◽  
Benzoic Acid ◽  
Molecular Crystal ◽  
Molar Ratio ◽  
Π Interactions ◽  
Centroid Distance ◽  
Two Component ◽  
Self Assembled

The title two-component molecular crystal [systematic name: 3-(dihydroxyboranyl)benzoic acid–1,3-dimethyl-7H-purine-2,6-dione (1/1)], C7H7BO4·C7H8N4O2, comprises theophylline and 3-carboxyphenylboronic acid molecules in a 1:1 molar ratio. In the crystal, molecules are self-assembled by O—H...O and N—H...N hydrogen bonds, generating layers parallel to (-209). The layers are stacked through π–π [centroid–centroid distance = 3.546 (2) Å] and C—H...π interactions.

Strategies for Crystal Engineering of Polar Solids

1993 ◽  
Vol 328 ◽  
Author(s):  
Mike Zaworotko ◽  
S. Subramanian ◽  
L. R. Macgillivray
Keyword(s):  
Hydrogen Bonding ◽  
Hydrogen Bonds ◽  
Crystal Engineering ◽  
Organic Cation ◽  
Polar Materials ◽  
Structural Analogues ◽  
Cubane Cluster ◽  
Self Assembled ◽  
Hydrogen Bonded

ABSTRACTCrystal engineering has been invoked to design structural analogues of two prototypal SHG active solids, p-nitroaniline (pNA) and potassium dihydrogenphosphate (KDP). pNA exists as linear polar strands because of head-to-tail hydrogen bonding between adjacent molecules whereas KDP is a self-assembled hydrogen bonded diamondoid network that becomes polar when the hydrogen bonds align. We detail preparation and crystallographic characterization of two classes of multicomponent solid, organic cation hydrogen sulfates and cocrystals of the cubane cluster [M (CO)3(μ3-OH)]4, which structurally mimic pNA and KDP, respectively. Several of the Multi-component solids are polar and they represent a generic approach to designing new polar materials since one component can be changed without altering the basic architecture within the crystal.

scholarly journals Hierarchical organization of a robust porphyrin cage self-assembled by hydrogen bonds

2011 ◽  
Vol 47 (25) ◽  
pp. 7134 ◽  
Author(s):  
Sunaina Singh ◽  
Amit Aggarwal ◽  
Christopher Farley ◽  
Brian A. Hageman ◽  
James D. Batteas ◽  
...  
Keyword(s):  
Hydrogen Bonds ◽  
Hierarchical Organization ◽  
Self Assembled

scholarly journals Use of Pyrazole Hydrogen Bonding in Tripodal Complexes to Form Self Assembled Homochiral Dimers

Materials ◽  
2020 ◽  
Vol 13 (7) ◽  
pp. 1595
Author(s):  
Greg Brewer ◽  
Raymond J. Butcher ◽  
Peter Zavalij
Keyword(s):  
Hydrogen Bonding ◽  
Hydrogen Bonds ◽  
New Materials ◽  
Tripodal Ligand ◽  
Space Group ◽  
Aerial Oxidation ◽  
Self Assembled

The 3:1 condensation of 5-methyl-1H-pyrazole-3-carboxaldehyde (MepyrzH) with tris(2-aminoethyl)amine (tren) gives the tripodal ligand tren(MePyrzH)3. Aerial oxidation of a solution of cobalt(II) with this ligand in the presence of base results in the isolation of the insoluble Co(tren)(MePyrz)3. This complex reacts with acids, HCl/NaClO4, NH4ClO4, NH4BF4, and NH4I to give the crystalline compounds Co(tren)(MePyrzH)3(ClO4)3, {[Co(tren)(MePyrzH0.5)3](ClO4)1.5}2 {[Co(tren)(MePyrzH0.5)3](BF4)1.5}2 and [Co(tren)(MePyrzH)3][Co(tren)(MePyrzH)3]I2. The latter three complexes are dimeric, held together by three Npyrazole –H…Npyrazolate hydrogen bonds. The structures and symmetries of these homochiral dimers or pseudodimers are discussed in terms of their space group. Possible applications of these complexes by incorporation into new materials are mentioned.

Two hydrate pseudopolymorphs of thiamine pyrophosphate: a dihydrate and a trihydrate

2013 ◽  
Vol 69 (7) ◽  
pp. 794-797
Author(s):  
Shu-Qiang Li ◽  
Ning-Hai Hu
Keyword(s):  
Hydrogen Bonds ◽  
Structural Study ◽  
Vitamin B1 ◽  
Pyrimidine Ring ◽  
Thiamine Pyrophosphate ◽  
Two Dimensional ◽  
Torsion Angles ◽  
Self Assembled ◽  
Methylene Group

Two hydrate pseudopolymorphs of 3-[(4-amino-2-methylpyrimidin-1-ium-5-yl)methyl]-4-methyl-1,3-thiazol-3-ium-5-yl hydrogen pyrophosphate (TPP),viz.a dihydrate, C12H18N4O7P2S·2H2O, (I), and a trihydrate, C12H18N4O7P2S·3H2O, (II), were obtained during a structural study of vitamin B1 coenzyme. In both compounds, TPP is a neutral zwitterion, with its pyrophosphate group doubly deprotonated and its pyrimidine ring protonated, and it assumes the usual `F' conformation in terms of the two torsion angles about the bonds by which the methylene group links the thiazolium and pyrimidinium rings [1.1 (3) and 79.7 (3)° for (I), and 2.0 (3) and 75.5 (3)° for (II)]. In (I), two TPP molecules are linked by a pair of O—H...O hydrogen bonds into a phosphate-pairing dimer. N—H...O hydrogen bonds connect the dimers into a sheet parallel to (101). In (II), the TPP molecules are self-assembled solely by N—H...O hydrogen bonds, generating a tape structure along [001]. A comparison of the four known hydrate pseudopolymorphs of TPP shows that the phosphate-pairing dimers are basic building units for the formation of two-dimensional networks.

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