scholarly journals Insights into interaction of chlorophylls with sodium caseinate in aqueous nanometre-scale dispersion: color stability, spectroscopic, electrostatic, and morphological properties

RSC Advances ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 4530-4538 ◽  
Author(s):  
Siyu He ◽  
Nan Zhang ◽  
Pu Jing
Keyword(s):  
Hydrogen Bonds ◽  
Self Assembly ◽  
Van Der Waals ◽  
Color Stability ◽  
Sodium Caseinate ◽  
Van Der Waals Forces ◽  
Morphological Properties

Stability of chlorophylls was improved with self-assembly of chlorophylls and NaCas nanoparticles via van der Waals forces and hydrogen bonds.

Self-Assembly of a Chiral Cubic Three-Connected Net from the High Symmetry Molecules C60 and SnI4

2020 ◽  
Author(s):  
Daniel B. Straus ◽  
Robert J. Cava
Keyword(s):  
Organic Synthesis ◽  
Self Assembly ◽  
Van Der Waals ◽  
Van Der Waals Forces ◽  
High Symmetry ◽  
Molecular Chirality ◽  
Chiral Materials ◽  
Self Assembled ◽  
Chiral Centers

The design of new chiral materials usually requires stereoselective organic synthesis to create molecules with chiral centers. Less commonly, achiral molecules can self-assemble into chiral materials, despite the absence of intrinsic molecular chirality. Here, we demonstrate the assembly of high-symmetry molecules into a chiral van der Waals structure by synthesizing crystals of C<sub>60</sub>(SnI<sub>4</sub>)<sub>2</sub> from icosahedral buckminsterfullerene (C<sub>60</sub>) and tetrahedral SnI4 molecules through spontaneous self-assembly. The SnI<sub>4</sub> tetrahedra template the Sn atoms into a chiral cubic three-connected net of the SrSi<sub>2</sub> type that is held together by van der Waals forces. Our results represent the remarkable emergence of a self-assembled chiral material from two of the most highly symmetric molecules, demonstrating that almost any molecular, nanocrystalline, or engineered precursor can be considered when designing chiral assemblies.

scholarly journals 2,4-Dibromo-2,3-dihydro-1H-inden-1-yl acetate

2012 ◽  
Vol 68 (6) ◽  
pp. o1884-o1884 ◽  
Author(s):  
Ísmail Çelik ◽  
Mehmet Akkurt ◽  
Makbule Yilmaz ◽  
Ahmet Tutar ◽  
Ramazan Erenler ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonds ◽  
Benzene Ring ◽  
Title Compound ◽  
Van Der Waals ◽  
Van Der Waals Forces ◽  
Stacking Interactions ◽  
Compound C ◽  
Centroid Distance ◽  
Cyclopentene Ring

In the title compound, C11H10Br2O2, the cyclopentene ring fused to the benzene ring adopts an envelope conformation, with the C atom attached to the Br atom as the flap. The crystal structure does not exhibit any classical hydrogen bonds. The molecular packing is stabilized by van der Waals forces and π–π stacking interactions with a centroid–centroid distance of 3.811 (4) Å.

The Difference of Serum Protein Transport between Echinosides and Verbascoside

2020 ◽  
Vol 42 (3) ◽  
pp. 369-369
Author(s):  
Ming Guo Ming Guo ◽  
Xiaoxue Zhao Xiaoxue Zhao ◽  
Peter E Brodelius Peter E Brodelius ◽  
Ling Fang Ling Fang ◽  
Zhihong Sun and Rui Wang Zhihong Sun and Rui Wang
Keyword(s):  
Molecular Modeling ◽  
Hydrogen Bonds ◽  
Serum Albumin ◽  
Protein Transport ◽  
Van Der Waals ◽  
Hydrolysis Product ◽  
Van Der Waals Forces ◽  
Molecular Structures ◽  
Hydrophobic Force ◽  
Binding Characteristics

Verbascoside (VER) is the enzymatic hydrolysis product of echinacoside (ECH). The molecular structures of ECH and VER have different glucosyl groups so they bind to serum albumin in different ways, resulting in different pharmacological actions. In this report, we have examined the binding characteristics between human serum albumin (HSA) and ECH/VER by molecular modeling and spectroscopic approaches. Molecular modeling revealed that VER bound to HSA mainly through hydrogen bonds, van der Waals forces and hydrophobic forces. The spectroscopic results showed that the interactions between HSA and VER/ECH involved a static binding process, and the bonding strength of the VER-HSA complex was stronger than that of the ECH-HSA complex. The value of the binding distances (r) was low, which indicated the occurrence of energy transfer. The reaction conformational pattern of HSA-VER and HSA-ECH gave a “two-state model” based on fluorescent phase diagram analysis. According to the thermodynamic model, the main forces between interaction of VER and HSA were hydrogen bonds and van der Waals forces, whereas the interaction between ECH and HSA was hydrophobic force. The fluorescence polarization analysis demonstrated that the interaction between HSA and VER or ECH generated a non-covalent complex. Compared with ECH, VER was more likely to bind with HSA because of its smaller molecular size and low polarity. The results of the spectral analysis concurred with the molecular modeling data, which provides a helpful reference for the study of the molecular reaction mechanism of VER/ECH binding to HSA.

scholarly journals Hydrogen Bonds and van der Waals Forces in Ice at Ambient and High Pressures

2011 ◽  
Vol 107 (18) ◽  
Author(s):  
Biswajit Santra ◽  
Jiří Klimeš ◽  
Dario Alfè ◽  
Alexandre Tkatchenko ◽  
Ben Slater ◽  
...  
Keyword(s):  
Hydrogen Bonds ◽  
High Pressures ◽  
Van Der Waals ◽  
Van Der Waals Forces

scholarly journals Crystal structure of dibromidotetrakis(propan-2-ol-κO)nickel(II)

2015 ◽  
Vol 71 (12) ◽  
pp. m263-m264
Author(s):  
Yaokang Lv ◽  
Mingxian Liu ◽  
Lvlv Ji ◽  
Cheng Zhang ◽  
Mi Ouyang
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonds ◽  
Van Der Waals ◽  
Van Der Waals Forces ◽  
Title Complex ◽  
Asymmetric Unit ◽  
Hexagonal Packing

The asymmetric unit of the mononuclear title complex, [NiBr2(C3H8O)4], comprises a NiIIcation located on a centre of inversion, one Br−anion and two propan-2-ol ligands. The NiIIcation exhibits a distortedtrans-Br2O4environment. There are O—H...Br hydrogen bonds connecting neighbouring molecules into rows along [100]. These rows are arranged in a distorted hexagonal packing and are held together by van der Waals forces only.

scholarly journals Success or Failure of Chiral Crystallization of Similar Heterocyclic Compounds

Molecules ◽  
2020 ◽  
Vol 25 (23) ◽  
pp. 5691
Author(s):  
Cyprian M. Chunkang ◽  
Iris E. Ikome ◽  
Emmanuel N. Nfor ◽  
Yuta Mitani ◽  
Natsuki Katsuumi ◽  
...  
Keyword(s):  
Hydrogen Bonds ◽  
Single Crystal ◽  
Single Crystals ◽  
Heterocyclic Compounds ◽  
Van Der Waals ◽  
Van Der Waals Forces ◽  
The Other ◽  
X Ray ◽  
Other Hand

Single crystals of two achiral and planar heterocyclic compounds, C9H8H3O(CA1) and C8H5NO2 (CA4), recrystallized from ethanol, were characterized by single crystal X-ray analysis, respectively, and chiral crystallization was observed only for CA1 as P212121 (# 19), whereas it was not observed for CA4 P21/c (# 14). In CA1, as a monohydrate, the hydrogen bonds were pronounced around the water of crystallization (O4), and the planar cyclic sites were arranged in parallel to slightly tilted positions. On the other hand, an anhydride CA4 formed a dimer by hydrogen bonds between adjacent molecules in the crystal, which were aggregated by van der Waals forces and placed in parallel planar cyclic sites.

scholarly journals Poly[μ2-aqua-aqua[μ3-N-butyl-N-(2-hydroxyethyl)dithiocarbamato-κ3O,O′:S]sodium]

2016 ◽  
Vol 72 (2) ◽  
pp. 196-198 ◽  
Author(s):  
Muzzaffar A. Bhat ◽  
Shalini Jain ◽  
Sanjay K. Srivastava ◽  
Ray J. Butcher ◽  
Jan Wikaira
Keyword(s):  
Hydrogen Bonds ◽  
Title Compound ◽  
Van Der Waals ◽  
Van Der Waals Forces ◽  
Octahedral Geometry ◽  
Distorted Octahedral Geometry ◽  
Inversion Center ◽  
Distorted Octahedral ◽  
Polymeric Layer

In the title compound, [Na(C7H14NOS2)(H2O)2]n, the NaIcation is coordinated by five O atoms [Na—O = 2.3142 (11)–2.4677 (10) Å] from three aqua and twoN-butyl-N-(2-hydroxyethyl)dithiocarbamate (L) ligands and one S atom [Na—S = 3.0074 (6) Å] from a thirdLligand in a highly distorted octahedral geometry. Two aqua ligands related by an inversion center bridge two NaIcations, and eachLligand coordinates three NaIcations, leading to a layered arrangement aligned parallel to thebcplane. Intermolecular O—H...S hydrogen bonds are observed in the inner part of each polymeric layer; these are packed along theaaxis and held together by weak van der Waals forces.

(E)-4-(Trifluoromethyl)benzaldehyde oxime

2006 ◽  
Vol 62 (7) ◽  
pp. o2683-o2684 ◽  
Author(s):  
Jiong Jia ◽  
Xi-Zhao Wang ◽  
Yan Zhang ◽  
Jian-Wu Wang
Keyword(s):  
Hydrogen Bonds ◽  
Title Compound ◽  
Crystal Packing ◽  
Van Der Waals ◽  
Van Der Waals Forces ◽  
Trifluoromethyl Group ◽  
Compound C

In the title compound, C8H6F3NO, the trifluoromethyl group displays rotational disorder. The crystal packing is stabilized by intermolecular O—H...N hydrogen bonds and van der Waals forces.

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