scholarly journals Relationship between Crystal Packing and Solid-State Fluorescence Quantum Yield in Pyrazine Monoboron Complexes

2020 ◽  
Vol 93 (9) ◽  
pp. 288-291
Author(s):  
Yasuhiro KUBOTA ◽  
Yuki HAISHIMA ◽  
Kazumasa FUNABIKI ◽  
Masaki MATSUI
2006 ◽  
Vol 128 (51) ◽  
pp. 16532-16539 ◽  
Author(s):  
Renqiang Yang ◽  
Andres Garcia ◽  
Dmitry Korystov ◽  
Alexander Mikhailovsky ◽  
Guillermo C. Bazan ◽  
...  

Nanoscale ◽  
2021 ◽  
Author(s):  
Swati Jindal ◽  
Gulshan Anjum ◽  
Vijay Kumar Maka ◽  
J. Narasimha Moorthy

A water-stable In-MOF, constructed based on a conformationally-flexible tetraacid linker, i.e., 2,7-bis(3,5-dicarboxyphenyl)-9,9’-diphenyl-9H-fluorene, i.e., H4DPF, is shown to exhibit significantly enhanced solid-state fluorescence quantum yield (Φf) of 23% in comparison to...


2020 ◽  
Vol 02 (01) ◽  
pp. 033-040 ◽  
Author(s):  
Hua Li ◽  
Haiyang Shu ◽  
Xin Wang ◽  
Xiaofu Wu ◽  
Hongkun Tian ◽  
...  

Halogen bonding, as a kind of intermolecular interaction, has rarely been used to tune solid-state emission properties of luminescent materials, especially fluorescent materials. Herein, three trans-enaminone (TE) derivatives (nonbrominated TE, monobrominated BrTE, and tribrominated Br3TE) with aggregation-induced emission property have been designed and synthesized. Two types of BrTE crystals (BrTE-B and BrTE-G) with different fluorescence properties were obtained. It was observed that their solid-state fluorescence has been enhanced by the formation of halogen bonding. In particular, the crystal BrTE-G containing Br…π interactions exhibits a fluorescence quantum yield (9.6%) nearly sevenfold higher than BrTE-B, the crystal without halogen bonding (1.4%), and fivefold higher than the nonbrominated TE derivative (2.1%). By careful inspection of the single-crystal data and theoretical calculations, the high fluorescence quantum yield of BrTE-G appears to be due to halogen-bonding interactions as well as multiple stronger intermolecular interactions which may restrain molecular motions, leading to the reduced nonradiative decay rate and the enhanced radiative decay rate. Additionally, increasing the number of bromine substituents may further promote the radiative decay rate, explaining therefore the higher fluorescence quantum yield (12.5%) of Br3TE.


Molecules ◽  
2021 ◽  
Vol 26 (11) ◽  
pp. 3393
Author(s):  
Mikhail A. Vershinin ◽  
Marianna I. Rakhmanova ◽  
Alexander S. Novikov ◽  
Maxim N. Sokolov ◽  
Sergey A. Adonin

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%.


2021 ◽  
Author(s):  
Hai-Jiao Wang ◽  
Wan-Yi Hou ◽  
Jing Kang ◽  
Xin-Yu Zhai ◽  
Hongli Chen ◽  
...  

Due to the direct π - π interaction and excessive energy resonance transfer, it is very challenging to prepare CDs with high fluorescence quantum yield (QY) in solid state. In...


CrystEngComm ◽  
2019 ◽  
Vol 21 (39) ◽  
pp. 5931-5946 ◽  
Author(s):  
Tamara A. Vaganova ◽  
Yurij V. Gatilov ◽  
Enrico Benassi ◽  
Igor P. Chuikov ◽  
Denis P. Pishchur ◽  
...  

Relationship between the hetarylamine chemical structure, crystal packing in homo- and co-crystals, and fluorescence effects (quenching, bathochromic and hypsochromic shifts).


Author(s):  
Huey Chong Kwong ◽  
Ai Jia Sim ◽  
C. S. Chidan Kumar ◽  
Ching Kheng Quah ◽  
Suchada Chantrapromma ◽  
...  

In the bischalcone molecule of the title compound, C24H18O4·2C3H7NO, the central benzene and terminal hydroxyphenyl rings form a dihedral angle of 14.28 (11)° and the central C=C double bond adopts a trans configuration. In the crystal, the bischalcone and solvate molecules are interconnected via O—H...O hydrogen bonds, which were investigated by Hirshfeld surface analysis. Solid-state fluorescence was measured at λex = 4400 Å. The emission wavelength appeared at 5510 Å, which corresponds to yellow light and the solid-state fluorescence quantum yield (F f) is 0.18.


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