Journal ArticleDOI
From Molecules to Interactions to Crystal Engineering: Mechanical Properties of Organic Solids.
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TLDR
This Account describes efforts at focusing down into mechanical properties of organic molecular crystals from the viewpoint of crystal engineering, which is the synthesis and design of functional molecular solids and presents examples where complex properties may be deliberately turned on or off in organic crystals.Abstract:
ConspectusMechanical properties of organic molecular crystals have been noted and studied over the years but the complexity of the subject and its relationship with diverse fields such as mechanochemistry, phase transformations, polymorphism, and chemical, mechanical, and materials engineering have slowed understanding. Any such understanding also needs conceptual advances—sophisticated instrumentation, computational modeling, and chemical insight—lack of such synergy has surely hindered progress in this important field. This Account describes our efforts at focusing down into this interesting subject from the viewpoint of crystal engineering, which is the synthesis and design of functional molecular solids. Mechanical properties of soft molecular crystals imply molecular movement within the solid; the type of property depends on the likelihood of such movement in relation to the applied stress, including the ability of molecules to restore themselves to their original positions when the stress is removed...read more
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Structure-mechanical property correlation of a series of 4-(1-Napthylvinyl) pyridine based cocrystals
TL;DR: In this article , three 4-(1-Napthylvinyl) pyridine-based cocrystals (1, 2 and 3) were obtained and the structure mechanical property correlation was investigated.
Journal ArticleDOI
Chlorinated diketopyrrolopyrrole dye exhibits a three-step polymorphic transition with thermosalient effects
Yusuke Kikuchi,Shinya Matsumoto +1 more
TL;DR: A tetramorphic system was discovered in a diketopyrrolopyrrole dye (3,6-bis(4-chlorophenyl)-2-propyl-2,5-dihydropyrrolo[3,4-c]pyrrole-1,4dione), with thermosalient effects during thermal phase transitions as mentioned in this paper.
Journal ArticleDOI
Structure–property correlations in piracetam polytypes
Pratik P. Upadhyay,Manish Kumar Mishra,Upadrasta Ramamurty,Upadrasta Ramamurty,Andrew D. Bond +4 more
TL;DR: In this paper, the authors analyzed the structure of piracetam molecules using energy-vector models derived from PIXEL pairwise intermolecular interaction energies and showed that the structure is polytypic and the principal expansion axes are parallel and perpendicular to the planes of the molecules.
Journal ArticleDOI
Host-Guest Doping in Flexible Organic Crystals for Room-Temperature Phosphorescence.
TL;DR: In this article , a host-guest doping strategy was proposed to achieve both the RTP and flexible properties of OSCs, and the results showed that the bright RTP arises from Förster resonance energy transfer (FRET) from the triphenylene molecules to the dopants.
Journal ArticleDOI
Thermosalience coupled to abrupt spin crossover with dynamic ligand motion in an iron(II) molecular crystal
Hiroaki Hagiwara,Souta Konomura +1 more
TL;DR: In this paper , an iron(II) molecular crystal was reported to show a thermosalient effect (crystal jumping) coupled to cooperative high-spin (HS) to low-spin spin crossover (SCO) for a single crystal.
References
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Journal ArticleDOI
Photodimerization in the solid state
TL;DR: In this article, a review of solid-state photochemistry can be found under four parallel headings: first, analysis of the topochemical postulate according to which the course of the solid state reaction and the stereochemistry of the photodimer (if any) can be predicted from the configuration and nearest-neighbour geometry of closest monomer molecules in the crystal lattice; secondly, the study of the lOCUS of the reaction, that is the dependence of the course or (dimerization, cis trans isomerization) on crystal texture (dislocation
Journal ArticleDOI
Isostructurality, Polymorphism and Mechanical Properties of Some Hexahalogenated Benzenes: The Nature of Halogen⋅⋅⋅Halogen Interactions
C. Malla Reddy,Michael T. Kirchner,Ravi C. Gundakaram,K. Anantha Padmanabhan,Gautam R. Desiraju +4 more
TL;DR: Both chemical and geometrical models need to be considered for X...X interactions in hexahalogenated benzenes, where nonspecificity of the weak interlayer interactions here is demonstrated by the structure of twinned crystals of these compounds.
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Mechanochemical preparation of co-crystals
TL;DR: The preparation of co-crystals via mechanochemistry combines the quest for clean and green processes with the investigation of multicomponent new materials, among the currently most fashionable systems in the crystal engineering field.
Journal ArticleDOI
Mechanochemistry: the varied applications of mechanical bond-breaking
TL;DR: In this paper, a wide range of practical applications of mechanochemistry are outlined with typical examples for ceramics, mechanical alloying, hydrogen storage, organic syntheses, waste remediation, leachings, surface plasmas, radical formation, explosives, nanotube formation, nanoparticles grafting, polymer technology, radical initiation, scratchless polishing, wear protection, lubrication, mechanochromism, nano-dissection, and many more.
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Elastic and bendable caffeine cocrystals: implications for the design of flexible organic materials.
Soumyajit Ghosh,C. Malla Reddy +1 more
TL;DR: A remarkably flexible, elastically bendable cocrystal solvate 1 is reported, formed from caffeine, 4-chloro-3-nitrobenzoic acid, and methanol in a 1:1:< 1 ratio (Figure 1).
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