Structure/Property Relationships for Polyamide 6 / Organoclay Nanocomposites in the Melt and in the Solid State

2005 ◽  
Vol 221 (1) ◽  
pp. 85-94 ◽  
Author(s):  
Vitaly M. Karaman ◽  
Valery P. Privalko ◽  
Eleonora G. Privalko ◽  
Bjorn Lehmann ◽  
Klaus Friedrich
Keyword(s):  
Solid State ◽  
Polyamide 6 ◽  
Structure Property ◽  
Structure Property Relationships

scholarly journals Crystal chemistry and photomechanical behavior of 3,4-dimethoxycinnamic acid: correlation between maximum yield in the solid-state topochemical reaction and cooperative molecular motion

IUCrJ ◽  
2015 ◽  
Vol 2 (6) ◽  
pp. 653-660 ◽  
Author(s):  
Manish Kumar Mishra ◽  
Arijit Mukherjee ◽  
Upadrasta Ramamurty ◽  
Gautam R. Desiraju
Keyword(s):  
Solid State ◽  
Crystal Packing ◽  
Maximum Yield ◽  
Structure Property ◽  
Crystal Forms ◽  
Individual Crystal ◽  
Structure Property Relationships ◽  
Molecular Movement ◽  
Truxillic Acid ◽  
The Individual

A new monoclinic polymorph, form II (P21/c,Z= 4), has been isolated for 3,4-dimethoxycinnamic acid (DMCA). Its solid-state 2 + 2 photoreaction to the corresponding α-truxillic acid is different from that of the first polymorph, the triclinic form I (P\bar 1,Z= 4) that was reported in 1984. The crystal structures of the two forms are rather different. The two polymorphs also exhibit different photomechanical properties. Form I exhibits photosalient behavior but this effect is absent in form II. These properties can be explained on the basis of the crystal packing in the two forms. The nanoindentation technique is used to shed further insights into these structure−property relationships. A faster photoreaction in form I and a higher yield in form II are rationalized on the basis of the mechanical properties of the individual crystal forms. It is suggested that both Schmidt-type and Kaupp-type topochemistry are applicable for the solid-statetrans-cinnamic acid photodimerization reaction. Form I of DMCA is more plastic and seems to react under Kaupp-type conditions with maximum molecular movements. Form II is more brittle, and its interlocked structure seems to favor Schmidt-type topochemistry with minimum molecular movement.

scholarly journals Molecular and Crystalline Requirements for Solid State Fluorescence Exploiting Excited State Intramolecular Proton Transfer

2019 ◽  
Author(s):  
Michael Dommett ◽  
Miguel Rivera ◽  
Matthew T. H. Smith ◽  
Rachel Crespo Otero
Keyword(s):  
Excited State ◽  
Solid State ◽  
Proton Transfer ◽  
Intramolecular Proton Transfer ◽  
Extensive Study ◽  
Structure Property ◽  
Aggregation Induced Emission ◽  
Organic Systems ◽  
Structure Property Relationships ◽  
Formidable Challenge

Aggregation induced emission offers a route to the development of emissive technologies based on solely organic systems. However, maximising fluorescence quantum efficiencies (QE) is a formidable challenge in attaining first-principles materials design, due to the interplay between the electronic structure of the chromophore and the molecular crystal. The identification of radiative and nonradiative channels, and how these are affected by aggregation, can rationalise the emissive properties of materials and aid in the design of yet more efficient fluorophores. In the current work, we examine the mechanism behind aggregation induced emission in two related families of compounds with lasing properties, which undergo excited state intramolecular proton transfer (ESIPT). We systematically investigate competing excited state decay channels in a total of eleven crystals to evaluate the factors needed for efficient ESIPT fluorophores, aided by a full evaluation of the crystal structures, exciton coupling, and exciton hopping rates. We show that in addition to the restriction of nonradiative pathways, an efficient ESIPT is essential to maximise the QE in the solid state. This extensive study of structure-property relationships for fluorophores based on the ESIPT mechanism bridges the understanding of molecular photophysics with crystal structure, accelerating the development of highly efficient solid state emitters.

Structure-property relationships in normal and mixed dithienylethenes – polyoxometalates supramolecular assemblies with fast solid-state photochromic properties

2021 ◽  
Author(s):  
Oleh Stetsiuk ◽  
Patricia Bolle ◽  
Marie Cordier ◽  
Julien Boixel ◽  
Rémi Dessapt
Keyword(s):  
Solid State ◽  
Single Crystal ◽  
Supramolecular Assembly ◽  
Supramolecular Assemblies ◽  
Inorganic Materials ◽  
Structure Property ◽  
X Ray Diffraction ◽  
Photochromic Properties ◽  
X Ray ◽  
Structure Property Relationships

Five new highly photochromic hybrid organic-inorganic materials were successfully prepared by supramolecular assembly of normal (1+) and mixed (2+) cationic dithienylethenes (DTEs) and polyoxometalates (POMs) units. Single-crystal X-ray diffraction studies...

Structure-property relationships in polyamide 6/multi-walled carbon nanotubes nanocomposites

2009 ◽  
Vol 47 (8) ◽  
pp. 764-774 ◽  
Author(s):  
Emmanuel Logakis ◽  
Christos Pandis ◽  
Vasilios Peoglos ◽  
Polycarpos Pissis ◽  
Charalampos Stergiou ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Polyamide 6 ◽  
Structure Property ◽  
Structure Property Relationships ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

scholarly journals Selenophene-containing heterotriacenes by a C–Se coupling/cyclization reaction

2019 ◽  
Vol 15 ◽  
pp. 1379-1393
Author(s):  
Pierre-Olivier Schwartz ◽  
Sebastian Förtsch ◽  
Astrid Vogt ◽  
Elena Mena-Osteritz ◽  
Peter Bäuerle
Keyword(s):  
Solid State ◽  
Single Crystal ◽  
Structure Property ◽  
Cyclization Reactions ◽  
X Ray ◽  
Structure Property Relationships ◽  
New Novel ◽  
Synthetic Routes ◽  
Interesting Structure

A new novel family of tricyclic sulfur and/or selenium-containing heterotriacenes 2–4 with an increasing number of selenium (Se) atoms is presented. The heterotriacene derivatives were synthesized in multistep synthetic routes and the crucial cyclization steps to the stable and soluble fused systems were achieved by copper-catalyzed C–S and C–Se coupling/cyclization reactions. Structures and packing motifs in the solid state were elucidated by single crystal X-ray analysis and XRD powder measurements. Comparison of the optoelectronic properties provides interesting structure–property relationships and gives valuable insights into the role of heteroatoms within the series of the heterotriacenes. Electrooxidative polymerization led to the corresponding poly(heterotriacene)s P2–P4.

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