Intermolecular Interactions Determine Exciton Lifetimes in Neat Films and Solid State Solutions of Metal-Free Phthalocyanine

2015 ◽  
Vol 119 (49) ◽  
pp. 27340-27347 ◽  
Author(s):  
Benjamin W. Caplins ◽  
Tyler K. Mullenbach ◽  
Russell J. Holmes ◽  
David A. Blank
Keyword(s):  
Solid State ◽  
Intermolecular Interactions ◽  
Metal Free ◽  
Neat Films

scholarly journals Convenient Access to Functionalized Non-Symmetrical Atropisomeric 4,4′-Bipyridines

Compounds ◽  
2021 ◽  
Vol 1 (2) ◽  
pp. 58-74
Author(s):  
Emmanuel Aubert ◽  
Emmanuel Wenger ◽  
Paola Peluso ◽  
Victor Mamane
Keyword(s):  
Solid State ◽  
Intermolecular Interactions ◽  
Medicinal Chemistry ◽  
Crystal Packing ◽  
Cross Coupling ◽  
Coupling Reactions ◽  
Halogen Bonds ◽  
Cross Coupling Reactions ◽  
Cyano Groups ◽  
Post Functionalization

Non-symmetrical chiral 4,4′-bipyridines have recently found interest in organocatalysis and medicinal chemistry. In this regard, the development of efficient methods for their synthesis is highly desirable. Herein, a series of non-symmetrical atropisomeric polyhalogenated 4,4′-bipyridines were prepared and further functionalized by using cross-coupling reactions. The desymmetrization step is based on the N-oxidation of one of the two pyridine rings of the 4,4′-bipyridine skeleton. The main advantage of this methodology is the possible post-functionalization of the pyridine N-oxide, allowing selective introduction of chlorine, bromine or cyano groups in 2- and 2′-postions of the chiral atropisomeric 4,4′-bipyridines. The crystal packing in the solid state of some newly prepared derivatives was analyzed and revealed the importance of halogen bonds in intermolecular interactions.

scholarly journals Giant room temperature elastocaloric effect in metal-free thin-film perovskites

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
Cheng Li ◽  
Yu Hui Huang ◽  
Jian-Jun Wang ◽  
Bo Wang ◽  
Yong Jun Wu ◽  
...  
Keyword(s):  
Thin Films ◽  
Solid State ◽  
Room Temperature ◽  
Entropy Change ◽  
Stress Change ◽  
Chemical Doping ◽  
Metal Free ◽  
Organic Ferroelectrics ◽  
Potential Applications ◽  
Unit Stress

AbstractSolid-state refrigeration which is environmentally benign has attracted considerable attention. Mechanocaloric (mC) materials, in which the phase transitions can be induced by mechanical stresses, represent one of the most promising types of solid-state caloric materials. Herein, we have developed a thermodynamic phenomenological model and predicted extraordinarily large elastocaloric (eC) strengths for the (111)-oriented metal-free perovskite ferroelectric [MDABCO](NH4)I3 thin-films. The predicted room temperature isothermal eC ΔSeC/Δσ (eC entropy change under unit stress change) and adiabatic eC ΔTeC/Δσ (eC temperature change under unit stress change) for [MDABCO](NH4)I3 are −60.0 J K−1 kg−1 GPa−1 and 17.9 K GPa−1, respectively, which are 20 times higher than the traditional ferroelectric oxides such as BaTiO3 thin films. We have also demonstrated that the eC performance can be improved by reducing the Young’s modulus or enhancing the thermal expansion coefficient (which could be realized through chemical doping, etc.). We expect these discoveries to spur further interest in the potential applications of metal-free organic ferroelectrics materials towards next-generation eC refrigeration devices.

Substituent and Solvent Effects on Intermolecular Interactions in Crystals of N-Acylhydrazone Derivatives: Single-Crystal X-ray, Solid-State NMR, and Computational Studies

2014 ◽  
Vol 14 (5) ◽  
pp. 2263-2281 ◽  
Author(s):  
Liliana Mazur ◽  
Katarzyna N. Jarzembska ◽  
Radosław Kamiński ◽  
Krzysztof Woźniak ◽  
Edyta Pindelska ◽  
...  
Keyword(s):  
Solid State ◽  
Single Crystal ◽  
Intermolecular Interactions ◽  
Solvent Effects ◽  
Solid State Nmr ◽  
Computational Studies ◽  
X Ray

Minute Torsional Reorganization Elicited Large Visible Range Fluorescence Gain in Terphenyl Derived Crystals

2022 ◽  
Author(s):  
Tapan Ghosh ◽  
Madalasa Mondal ◽  
Ratheesh Vijayaraghavan
Keyword(s):  
Solid State ◽  
Intermolecular Interactions ◽  
Organic Semiconductor ◽  
Structural Rearrangement ◽  
Semiconductor Materials ◽  
Visible Range ◽  
Optical Signals ◽  
Electro Optic ◽  
Organic Semiconductor Materials

Understanding the variations in the solid-state optical signals of organic semiconductor materials upon subtle structural rearrangement or intermolecular interactions would help to extract the best performance in their electro-optic devices....

scholarly journals Solid-State NMR Identification of Intermolecular Interactions in Amelogenin Bound to Hydroxyapatite

2018 ◽  
Vol 115 (9) ◽  
pp. 1666-1672 ◽  
Author(s):  
Rajith Jayasinha Arachchige ◽  
Sarah D. Burton ◽  
Jun-Xia Lu ◽  
Bojana Ginovska ◽  
Larisa K. Harding ◽  
...  
Keyword(s):  
Solid State ◽  
Intermolecular Interactions ◽  
Solid State Nmr ◽  
Nmr Identification
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