Steric Control over Supramolecular Aggregation: A Design Element in Crystal Engineering?

2006 ◽  
pp. 117-134 ◽  
Author(s):  
Edward R. T. Tiekink
Keyword(s):  
Crystal Engineering ◽  
Design Element ◽  
Supramolecular Aggregation ◽  
Steric Control

Secondary bonding as a potential design element for crystal engineering

1999 ◽  
Vol 23 (10) ◽  
pp. 969-972 ◽  
Author(s):  
Jonathan Starbuck ◽  
Nicholas C. Norman ◽  
A. Guy Orpen
Keyword(s):  
Crystal Engineering ◽  
Design Element ◽  
Secondary Bonding

Crystal engineering using bisphenols and trisphenols. Complexes with 1,10-phenanthroline: hydrogen-bonded chains in adducts with 4,4′-biphenol (1/1) and 4,4′-sulfonyldiphenol (2/3), π–π stacked chains in the (1/2) adduct with 4,4′-thiodiphenol, and pairwise-interwoven nets in 1,1,1-tris(4-hydroxyphenyl)ethane–1,10-phenanthroline–methanol (1/1/1)

1999 ◽  
Vol 55 (4) ◽  
pp. 591-600 ◽  
Author(s):  
George Ferguson ◽  
Christopher Glidewell ◽  
Emma S. Lavender
Keyword(s):  
Hydrogen Bond ◽  
Hydrogen Bonds ◽  
Crystal Engineering ◽  
Hydroxyl Group ◽  
Hydroxyl Groups ◽  
Two Dimensional ◽  
Rotation Axes ◽  
Molecular Components ◽  
Supramolecular Aggregation ◽  
Hydrogen Bonded

In 4,4′-biphenol–1,10-phenanthroline (1/1) [systematic name: 4,4′-biphenyldiol–1,10-phenanthroline (1/1)] the diphenol molecules lie across centres of inversion and the phenanthroline molecules lie across twofold rotation axes; the phenanthroline molecules act as chain-building units and the molecular components are linked into steeply zigzag C(16) chains parallel to [101] by means of O—H...N hydrogen bonds. In the structure of 4,4′-thiodiphenol–1,10-phenanthroline (1/2) the phenanthroline molecules act as chain-terminating units; the supramolecular aggregation is finite, with the bisphenol linked to each phenanthroline molecule by means of a single O—H...N hydrogen bond. π−π stacking interactions between the phenanthroline molecules in neighbouring hydrogen-bonded aggregates serve to link these aggregates into a continuous two-dimensional array. The phenanthroline molecules in 4,4′-sulfonyldiphenol–1,10-phenanthroline (2/3) play two roles: molecules in general positions act as chain-terminating units and are linked to the sulfonyldiphenol molecules by means of three-centre O—H...(N)2 hydrogen bonds, while those lying across twofold rotation axes act as chain builders and are linked to two different sulfonyldiphenol molecules by means of a two-centre O—H...N hydrogen bond in each case; the resulting U-shaped five-component aggregates are further linked by C—H...O=S hydrogen bonds into a C_3^3(17)[R_2^2(12)] `chain of rings' along [001]. In 1,1,1-tris(4-hydroxyphenyl)ethane–1,10-phenanthroline–methanol (1/1/1) [systematic name: 4,4′,4′′-ethylidynetriphenol–1,10-phenanthroline–methanol (1/1/1)] the phenanthroline molecules again act as chain-terminating units: the trisphenol molecules and the methanol molecules are linked by O—H...O hydrogen bonds into two-dimensional nets built from R_6^6(42) rings, and pairs of these nets are interwoven. The formation of each net utilizes two hydroxyl groups per trisphenol molecule as hydrogen-bond donors and the remaining hydroxyl group acts as donor to the phenanthroline molecule in a three-centre O—H...(N)2 hydrogenbond.

Template mediated crystal engineering

1994 ◽  
Vol 52 ◽  
pp. 480-481
Author(s):  
Brigid R. Heywood ◽  
S. Champ
Keyword(s):  
Crystal Engineering ◽  
Electrostatic Interactions ◽  
Alkyl Chain ◽  
Crystallographic Axis ◽  
Two Dimensional ◽  
Engineering Process ◽  
Solution Interface ◽  
Extensive Program ◽  
Geometric Homology ◽  
Long Alkyl Chain

Recent work on the crystallisation of inorganic crystals under compressed monomolecular surfactant films has shown that two dimensional templates can be used to promote the oriented nucleation of solids. When a suitable long alkyl chain surfactant is cast on the crystallisation media a monodispersied population of crystals forms exclusively at the monolayer/solution interface. Each crystal is aligned with a specific crystallographic axis perpendicular to the plane of the monolayer suggesting that nucleation is facilitated by recognition events between the nascent inorganic solid and the organic template.For example, monolayers of the long alkyl chain surfactant, stearic acid will promote the oriented nucleation of the calcium carbonate polymorph, calcite, on the (100) face, whereas compressed monolayers of n-eicosyl sulphate will induce calcite nucleation on the (001) face, (Figure 1 & 2). An extensive program of research has confirmed the general principle that molecular recognition events at the interface (including electrostatic interactions, geometric homology, stereochemical complementarity) can be used to promote the crystal engineering process.

SYNTHESIS OF ELEMENTS OF LOAD-BEARING SYSTEMS WITH A GIVEN LEVEL OF RELIABILITY

2020 ◽  
Author(s):  
Y.P. Manshin ◽  
◽  
E.Yu. Manshina ◽  
Keyword(s):  
Strain Measurement ◽  
Field Strain ◽  
Design Element ◽  
Load Bearing ◽  
Cyclic Bending ◽  
Bending Stresses

The article considers an algorithm for analyzing the results of field strain-measurement studies of machine structures, which allows obtaining data for the modernization of elements in the form of coefficients of parameter changes. As the object of application of the method, the design element of the header was selected, which had failures due to insufficient endurance under cyclic bending stresses.

The Simplest Patterns of Interpenetrated Honeycomb Layers – Counter examples to the Minimal Transitivity Principle?

2018 ◽  
Author(s):  
Igor Baburin
Keyword(s):  
Crystal Engineering ◽  
Structural Chemistry ◽  
Broad Context ◽  
Rigorous Derivation ◽  
New Approach

The paper calls attention to the most symmetric interpenetration patterns of honeycomb layers. To the best of my knowledge, such patterns remained unknown so far. In my contribution a rigorous derivation of such patterns is given that makes use of a new approach to interpenetrating nets. The results are presented in a broad context of structural chemistry and crystal engineering.

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