2-Substituted Perimidines: Zwitterionic Tauterism in Solid State, Substituent Effect on their Crystal Packing and Biological Activity.

2021 ◽  
pp. 132056
Author(s):  
César Augusto Fernández-Gijón ◽  
Jessica Olvera-Mancilla ◽  
Ronan Le Lagadec ◽  
Noráh Barba-Behrens ◽  
Hugo Rico-Bautista ◽  
...  
Keyword(s):  
Biological Activity ◽  
Solid State ◽  
Substituent Effect ◽  
Crystal Packing

scholarly journals ortho-Substituent effect on the crystal packing and solid state speciation of aromatic C-nitroso compounds

CrystEngComm ◽  
2020 ◽  
Vol 22 (30) ◽  
pp. 5040-5048
Author(s):  
Sarah J. Pike ◽  
Armelle Heliot ◽  
Colin C. Seaton
Keyword(s):  
Solid State ◽  
Substituent Effect ◽  
Crystal Packing ◽  
Nitroso Compounds ◽  
Short Series ◽  
State Behaviour ◽  
Ortho Substituent

The solid state behaviour of a short series aromatic C-nitroso compounds has been studied as a function of the electronic and steric nature of the ortho-substituent on the ring.

The Influence of Nitrogen Position on Charge Carrier Mobility in Enantiopure Aza[6]helicene Crystals

2018 ◽  
Author(s):  
Francesco Salerno ◽  
Beth Rice ◽  
Julia Schmidt ◽  
Matthew J. Fuchter ◽  
Jenny Nelson ◽  
...  
Keyword(s):  
Solid State ◽  
Charge Carrier ◽  
Carrier Mobility ◽  
Chemical Structure ◽  
Crystal Packing ◽  
Charge Carrier Mobility ◽  
Individual Factor ◽  
Charge Mobility ◽  
Order Of Magnitude ◽  
Small Change

<p>The properties of an organic semiconductor are dependent on both the chemical structure of the molecule involved, and how it is arranged in the solid-state. It is challenging to extract the influence of each individual factor, as small changes in the molecular structure often dramatically change the crystal packing and hence solid-state structure. Here, we use calculations to explore the influence of the nitrogen position on the charge mobility of a chiral organic molecule when the crystal packing is kept constant. The transfer integrals for a series of enantiopure aza[6]helicene crystals sharing the same packing were analysed in order to identify the best supramolecular motifs to promote charge carrier mobility. The regioisomers considered differ only in the positioning of the nitrogen atom in the aromatic scaffold. The simulations showed that even this small change in the chemical structure has a strong effect on the charge transport in the crystal, leading to differences in charge mobility of up to one order of magnitude. Some aza[6]helicene isomers that were packed interlocked with each other showed high HOMO-HOMO integrals (up to 70 meV), whilst molecules arranged with translational symmetry generally afforded the highest LUMO-LUMO integrals (40 - 70 meV). As many of the results are not intuitively obvious, a computational approach provides additional insight into the design of new semiconducting organic materials.</p>

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 Zn(II) Heteroleptic Halide Complexes with 2-Halopyridines: Features of Halogen Bonding in Solid State

Molecules ◽  
2021 ◽  
Vol 26 (11) ◽  
pp. 3393
Author(s):  
Mikhail A. Vershinin ◽  
Marianna I. Rakhmanova ◽  
Alexander S. Novikov ◽  
Maxim N. Sokolov ◽  
Sergey A. Adonin
Keyword(s):  
Solid State ◽  
Quantum Yield ◽  
Crystal Packing ◽  
Halogen Bonding ◽  
Molecular Complexes ◽  
Substituted Pyridines ◽  
Halide Complexes

Reactions between Zn(II) dihalides and 2-halogen-substituted pyridines 2-XPy result in a series of heteroleptic molecular complexes [(2-XPy)2ZnY2] (Y = Cl, X = Cl (1), Br (2), I (3); Y = Br, X = Cl (4), Br (5), I (6), Y = I, X = Cl (7), Br (8), and I (9)). Moreover, 1–7 are isostructural (triclinic), while 8 and 9 are monoclinic. In all cases, halogen bonding plays an important role in formation of crystal packing. Moreover, 1–9 demonstrate luminescence in asolid state; for the best emitting complexes, quantum yield (QY) exceeds 21%.

scholarly journals Visualising crystal packing interactions in solid-state NMR: Concepts and applications

2017 ◽  
Vol 147 (14) ◽  
pp. 144203 ◽  
Author(s):  
Miri Zilka ◽  
Simone Sturniolo ◽  
Steven P. Brown ◽  
Jonathan R. Yates
Keyword(s):  
Solid State ◽  
Solid State Nmr ◽  
Crystal Packing ◽  
Packing Interactions

Substituent Effect of 2,3-Dicyanopyrazine Dyes on Solid-State Fluorescence

2006 ◽  
Vol 79 (5) ◽  
pp. 799-805 ◽  
Author(s):  
Emi Horiguchi ◽  
Shinya Matsumoto ◽  
Kazumasa Funabiki ◽  
Masaki Matsui
Keyword(s):  
Solid State ◽  
Substituent Effect ◽  
Solid State Fluorescence

Substituent Effect on the Solid-State Photoinduced Luminescence of α-Cyanostilbene Derivatives

2019 ◽  
Vol 41 (5) ◽  
pp. 868-868
Author(s):  
Huan Yuan Long Huan Yuan Long ◽  
Jin Zhang Jin Zhang ◽  
Zi Wei Li Zi Wei Li ◽  
Peng Zhou Peng Zhou ◽  
Tian Ying Peng and Guo Wen He Tian Ying Peng and Guo Wen He
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Solid State ◽  
Magnetic Resonance ◽  
Substituent Effect ◽  
Software Package ◽  
Luminescence Properties ◽  
Dilute Solutions ◽  
Yellow Color ◽  
Vis Spectroscopy ◽  
Color Emission

A series of α-cyanostilbene derivatives with aggregation-induced enhanced emission （AIEE） was obtained. All the compounds were characterized by UV−vis spectroscopy, fluorescence and nuclear magnetic resonance. These compounds exhibited blue, green and yellow color emission in solid state but non-fluorescent in dilute solutions. The electronic characteristics were examined by GAMESS Interface software package. The results indicate that the luminescence properties are affected by the substituents.

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