Novel organosoluble polyarylates based on diphenylamine-fluorene units

2017 ◽  
Vol 30 (7) ◽  
pp. 864-871 ◽  
Author(s):  
Shiyao Meng ◽  
Ningwei Sun ◽  
Kaixin Su ◽  
Xiaogang Zhao ◽  
Daming Wang ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Transfer Effect ◽  
Enhanced Fluorescence ◽  
Terephthaloyl Chloride ◽  
Transparent Films ◽  
Coloration Efficiency ◽  
Half Wave ◽  
Reversible Redox ◽  
Solution Cast ◽  
Isophthaloyl Chloride

Two kinds of polyarylates with diphenylamine-fluorene units were synthesized from the bisphenol monomer “ N, N-di(4-hydroxyphenyl)-2-amino-9,9-dimethylfluorene” with two different benzenedicarbonyl chlorides. These polyarylates were highly soluble in N, N-dimethylacetamide, tetrahydrofuran, and chloroform and could be easily solution-cast into transparent films. Both of the polyarylates exhibited a couple of reversible redox with half-wave potentials in the range of 0.87–0.90 V. During the electrochromic process, the color of the film changed from colorless (neutral state) to grey green (oxidation state) with a high coloration efficiency of 242 cm2 C−1. Compared with the polyarylates prepared from terephthaloyl chloride, the polyarylates prepared from isophthaloyl chloride exhibited enhanced fluorescence because of the reduced charge-transfer effect. Furthermore, its fluorescence could be reversibly switched under the applied potentials.

Morphological transformations in solution-cast Styrene-Butadiene-Styrene (SBS) triblock copolymer thin films

1995 ◽  
Vol 53 ◽  
pp. 184-185
Author(s):  
Ginam Kim ◽  
W. Marsillo ◽  
M. Libera
Keyword(s):  
Thin Films ◽  
Triblock Copolymer ◽  
Annealing Treatment ◽  
Minor Component ◽  
Solvent Evaporation ◽  
Single Crystal Substrate ◽  
Transparent Films ◽  
Crystal Substrate ◽  
Solution Cast ◽  
Morphological Transformations

The fact that block copolymers can assume a range of morphologies depending upon such variables as relative block length and molecular weight is now well known. In the case of poly(styrene)[PS]-poly(butadiene)[PB]-poly(styrene) (SBS) triblock copolymer, the morphologies range from spheres (roughly ~20% minor component), to cylinders (roughly 20%~35% minor component), to lamellae (roughly equal component fractions) Most recently, there has been increasing interest in transformations between morphologies by thermal annealing. This paper describes initial results studying the effect of solvent evaporation rate and post-casting annealing treatment on the morphology of SBS thin films.TEM specimens were prepared by solution casting electron transparent films. 50 μl of 0.1 wt% SBS (30% styrene, Mw=14,000, Scientific Polymer Products, Inc.) dissolved in toluene was deposited on a polished NaCl single crystal substrate placed in a small dish. After solvent evaporation the film was cut into small squares, floated from the salt in water, and each square was collected on a Cu grid.

Tunable Intramolecular Charge Transfer Effect on Diphenylpyrazine‐Based Linear Derivatives and Their Expected Performance in Blue Emitters

2021 ◽  
pp. 2101085
Author(s):  
Haozhong Wu ◽  
Ganggang Li ◽  
Juanjuan Luo ◽  
Tao Chen ◽  
Yao Ma ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Intramolecular Charge Transfer ◽  
Transfer Effect ◽  
Expected Performance ◽  
Blue Emitters

A benzothiazole-based fluorescence turn-on sensor for copper(II)

2021 ◽  
Author(s):  
Gyeongjin Kim ◽  
Donghwan Choi ◽  
Cheal Kim
Keyword(s):  
Charge Transfer ◽  
Limit Of Detection ◽  
Theoretical Calculations ◽  
Enhanced Fluorescence ◽  
Turn On ◽  
Fluorescent Response ◽  
Chelation Enhanced Fluorescence ◽  
Fluorescence Turn On ◽  
Internal Charge Transfer ◽  
Internal Charge

Abstract A new benzothiazole-based chemosensor BTN (1-((Z)-(((E)-3-methylbenzo[d]thiazol-2(3H)-ylidene)hydrazono)methyl)naphthalen-2-ol) was synthesized for the detection of Cu2+. BTN could detect Cu2+ with “off-on” fluorescent response from colorless to yellow irrespective of presence of other cations. Limit of detection for Cu2+ was determined to be 3.3 µM. Binding ratio of BTN and Cu2+ turned out to be a 1:1 with the analysis of Job plot and ESI-MS. Sensing feature of Cu2+ by BTN was explained with theoretical calculations, which might be owing to internal charge transfer and chelation-enhanced fluorescence processes.

SUBSTITUTION AT OCTAHEDRAL CENTERS: II. EFFECT OF SALTS UPON THE RATE OF HYDROLYSIS OF THE HALOPENTAMMINECHROMIUM(III) IONS

1961 ◽  
Vol 39 (11) ◽  
pp. 2371-2379 ◽  
Author(s):  
T. P. Jones ◽  
W. E. Harris ◽  
W. J. Wallace
Keyword(s):  
Charge Transfer ◽  
Transfer Effect ◽  
Ion Pair ◽  
Pair Formation ◽  
Sodium Salts ◽  
Rate Acceleration ◽  
Rate Of Hydrolysis ◽  
A Charge ◽  
Hydrolysis Of ◽  
Octahedral Configuration

A study of the hydrolysis of the halopentamminechromium(III) ions in the presence of the sodium salts of weak acids reveals a rate acceleration due to specific ion-pair formation. The acceleration is due partly to a charge-transfer effect and partly to the fact that the ion helps to maintain the octahedral configuration of the complex in the transition state. It is concluded that the reaction occurs by dissociation, but without collapse of the structure to a five-co-ordinated intermediate.

The charge transfer effect in Pd compounds (II): evidence from the L3 X-ray absorption near edge structure spectroscopy

2004 ◽  
Vol 59 (6) ◽  
pp. 901-904 ◽  
Author(s):  
Zhenlin Liu ◽  
Katsumi Handa ◽  
Kazuki Kaibuchi ◽  
Yoichi Tanaka ◽  
Jun Kawai
Keyword(s):  
Charge Transfer ◽  
Transfer Effect ◽  
Edge Structure ◽  
X Ray ◽  
X Ray Absorption

Self-Consistent Calculation of the Band Structure of C8K Including the Charge Transfer Effect

1979 ◽  
Vol 47 (4) ◽  
pp. 1125-1133 ◽  
Author(s):  
Takahisa Ohno ◽  
Kenji Nakao ◽  
Hiroshi Kamimura
Keyword(s):  
Charge Transfer ◽  
Band Structure ◽  
Transfer Effect ◽  
Consistent Calculation ◽  
Self Consistent

Poly(spirobifluorene)s Containing Nonconjugated Diphenylsulfone Moiety: Toward Blue Emission Through a Weak Charge Transfer Effect

2014 ◽  
Vol 47 (9) ◽  
pp. 2907-2914 ◽  
Author(s):  
Xuchao Wang ◽  
Lei Zhao ◽  
Shiyang Shao ◽  
Junqiao Ding ◽  
Lixiang Wang ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Blue Emission ◽  
Transfer Effect ◽  
Weak Charge

Blue Thermally Activated Delayed Fluorescence Polymers with Nonconjugated Backbone and Through-Space Charge Transfer Effect

2017 ◽  
Vol 139 (49) ◽  
pp. 17739-17742 ◽  
Author(s):  
Shiyang Shao ◽  
Jun Hu ◽  
Xingdong Wang ◽  
Lixiang Wang ◽  
Xiabin Jing ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Space Charge ◽  
Transfer Effect ◽  
Delayed Fluorescence ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated
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