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Honeycomb Network (honeycomb + network)

Distribution by Scientific Domains
Chemistry75%

Selected Abstracts

Guest,Guest,Host Multicomponent Molecular Crystals: Entrapment of Guest,Guest in Honeycomb Networks Formed by Self-Assembly of 1,3,5-Tri(4-hydroxyaryl)benzenes

CHEMISTRY - A EUROPEAN JOURNAL, Issue 26 2010
Jarugu, Narasimha Moorthy Prof.
Abstract Sterically-engineered rigid trigonal molecular modules based on 1,3,5-tri(4-hydroxyphenyl)benzenes H1 and H2 undergo O-H,,,O hydrogen-bonded self-assembly into eight-fold catenated hexagonal (6,3) and two-fold interpenetrated undulated square (4,4) networks, respectively. In the presence of [18]crown-6 as a guest, the triphenol H1 is found to self-assemble into a honeycomb network with hexagonal voids created between three triphenol building blocks. The guest [18]crown-6 molecules are found to be nicely nested in hexagonal enclosures. The empty spaces within the crowns can be further filled with neutral (MeOH/water, MeOH/MeNO2) or ionic guest species such as KI/KAcAc to furnish novel multicomponent assemblies, that is, guest,guest,host, that typify Russian dolls. In contrast, triphenol H2 is found to yield analogous multicomponent molecular crystals in which the guest crown,K+ acts as a spacers in the hydrogen-bonded self-assembly that leads to distorted chicken wire networks. [source]

Molecular Auxetic Behavior of Epitaxial Co-Ferrite Spinel Thin Film

ADVANCED FUNCTIONAL MATERIALS, Issue 4 2010
Matjaz Valant
Abstract In functional oxide materials so-called molecular auxetic behavior is extremely rare. Here, it is reported in the CoFe2O4 spinel structure. A CoFe2O4 epitaxial thin film under compressive axial strain also reduces its cell dimensions in the transverse direction with a Poisson's ratio of ,0.85. A hinge-like honeycomb network in the spinel structure is identified as being responsible for the negative Poisson's ratio. This phenomenon has a substantial effect on the functional properties of CoFe2O4 and enables the construction of a new class of nano-devices. [source]

Guest,Guest,Host Multicomponent Molecular Crystals: Entrapment of Guest,Guest in Honeycomb Networks Formed by Self-Assembly of 1,3,5-Tri(4-hydroxyaryl)benzenes

CHEMISTRY - A EUROPEAN JOURNAL, Issue 26 2010
Jarugu, Narasimha Moorthy Prof.
Abstract Sterically-engineered rigid trigonal molecular modules based on 1,3,5-tri(4-hydroxyphenyl)benzenes H1 and H2 undergo O-H,,,O hydrogen-bonded self-assembly into eight-fold catenated hexagonal (6,3) and two-fold interpenetrated undulated square (4,4) networks, respectively. In the presence of [18]crown-6 as a guest, the triphenol H1 is found to self-assemble into a honeycomb network with hexagonal voids created between three triphenol building blocks. The guest [18]crown-6 molecules are found to be nicely nested in hexagonal enclosures. The empty spaces within the crowns can be further filled with neutral (MeOH/water, MeOH/MeNO2) or ionic guest species such as KI/KAcAc to furnish novel multicomponent assemblies, that is, guest,guest,host, that typify Russian dolls. In contrast, triphenol H2 is found to yield analogous multicomponent molecular crystals in which the guest crown,K+ acts as a spacers in the hydrogen-bonded self-assembly that leads to distorted chicken wire networks. [source]

Syntheses and Crystal Structure of a New 3D Ag (I)-Fumaric Acid Framework, [Ag (hmt) (fma)1/2 · 2H2O]n

CHINESE JOURNAL OF CHEMISTRY, Issue 6 2003
Bi Wen-Hua
Abstract A new silver (I) coordination polymer, [Ag(hmt) (fma)1/2 · 2H2O]n (1), (hmt = hexamethylenetetramine, fma = furmaric acid), was obtained by self-assembly of hmt, fma and AgNO3 in the mixed solvent of methanol, dichloromethane and water (CH3OH:CH2Cl2:H2O = 5:5:1), and characterized by X-ray diffraction analysis. Complex 1 belongs to orthorhombic space group Pbcn with cell parameters a = 1.72043(5) nm, b=1.19704(2) nm, c = 1.11685(3) nm, V = 2.30007(10) nm3, Z = 8, CCDC number: 194381. In complex 1, each hmt ligand acts as a ,3 -bridge to link three Ag(I) atoms and in turn every Ag(I) ion attaches to three hmt ligands to produce a 2D honeycomb network, which is further linked by the bidentate fma ligands to form a 3D noninterpenetrating open framework with one-dimensional channels being filled by guest molecules. [source]