- Anion-regulated transient and persistent phosphorescence and size-dependent ultralong afterglow of organic ionic crystals
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It is a formidable challenge to achieve highly efficient organic afterglow and readily tunable transient and persistent phosphorescence of organic materials because of the lack of valid design principles. Herein, we report the regulation of the transient and persistent room-temperature phosphorescence of organic ionic crystals by the alteration of anions, and the unique size-dependent ultralong afterglow of tetraphenylphosphonium perchlorate (TPP ClO4) crystals under ambient conditions. Three organic ionic crystals show sharply distinct triplet emissions based on three heavy-atom free anions by proper construction of donor-acceptor patterns in the crystals. TPP ClO4 crystals exhibit ultrabright transient phosphorescence and ultralong afterglow, and the gradual enhancement of the afterglow with the crystal size directly proves the generation of ultralong afterglow from aggregates with strong intermolecular interactions in the crystals. These results greatly contribute to the general design principles of highly efficient transient and persistent phosphorescence and their regulations by rational design. Highly sensitive detection and imaging of perchlorate ions are achieved in a phosphorescence turn-on manner based on the bright room-temperature phosphorescence of TPP ClO4 crystals, and valuable anti-counterfeiting applications of the ultralong afterglow of TPP ClO4 crystals are also demonstrated in practical examples.
- Chen, Guilin,Guo, Sidan,Feng, Hui,Qian, Zhaosheng
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- Structures of alkali metal salts with [W(CN)6(bpy)]? ion. Comparative studies to W(IV) analogues
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Three complexes with the formula Na[W(CN)6(bpy)]·H2O (1), K[W(CN)6(bpy)] (2) and Rb[W(CN)6(bpy)] (3) have been synthesized and structurally characterized based on the X-ray analysis of single crystals, as well as described and compared with analogues in which the tungsten atom is in the fourth oxidation state. All salts crystallize in orthorhombic (Pbca for 1) or monoclinic (P21/c for 2 and 3) space groups. Contrary to the layered systems containing the negative anionic complexes of W(IV), the compounds described in the publication containing the negative anionic complexes of W(V) form much more complex structural systems, the arrangement of which is based on an extensive network of bridging cyanido ligands. This network is additionally stabilized by π-π type interactions of bipyridyl ligands. This phenomenon of a different spatial arrangement of the structure in the studied compounds compared to the layered W(IV) systems is surprising and proves that the structure of the bridge cyanido systems is influenced by many, previously unpredictable factors, and the knowledge of crystal engineering of cyanido polymers itself is not field too vast.
- Hodorowicz, Maciej,Jurowska, Anna,Szklarzewicz, Janusz
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- A MOLECULAR MAGNETIC MATERIAL AND A METHOD FOR PREPARATION THEREOF
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A molecular magnetic material comprising salt molecules of a hexsacyanide tungsten anion complex of the formula: [WIV(CN)6(NN)]2-, a hexsacyanide tungsten anion complex of the formula: [WV(CN)6(NN)]-, wherein: W is a tungsten cation, CN is a cyano ligand, and NN is an NN-donating bidentate organic ligand forming a five- membered ring with the tungsten atom; and at least one type of a cation [A]n+?, where n is an integer in the range of 1 to 4.
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Page/Page column 22-24; 26
(2020/12/30)
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- Interaction of an Allene with Polyvalent Iodine Derivatives. Preparation, X-ray Molecular Structure, and Some Reactions of Phenyl(2,2-dimethyl-4-(diethylphosphono)-2,5-dihydro-3-furyl)iodonium Salts
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Allene 1 reacts with PhIO/BF3*Et2O or PhIF2/BF3*Et2O in CH2Cl2 at -60 deg C with the formation of novel phenyldihydrofuryliodonium salts 2.Molecular structures for both products 2a,b are determined by X-ray analysis.Iodonium perchlorate 2b reacts with the
- Zefirov, N. S.,Koz'min, A. S.,Kasumov, T.,Potekhin, K. A.,Sorokin, V. D.,et al.
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p. 2433 - 2437
(2007/10/02)
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