18908-66-2Relevant articles and documents
The Influence of Solubilizing Chain Stereochemistry on Small Molecule Photovoltaics
Zerdan, Raghida Bou,Shewmon, Nathan T.,Zhu, Yu,Mudrick, John P.,Chesney, Kyle J.,Xue, Jiangeng,Castellano, Ronald K.
, p. 5993 - 6004 (2014)
Three stereochemically pure isomers and two isomeric mixtures of a solution-processable diketopyrrolopyrrole-containing oligothiophene (SMDPPEH) have been used to study the effect of 2-ethylhexyl solubilizing group stereochemistry on the film morphology and bulk heterojunction (BHJ) solar cell characteristics of small molecule organic photovoltaics. The different SMDPPEH stereoisomer compositions exhibit nearly identical optoelectronic properties in the molecularly dissolved state, as well as in amorphous films blended with PCBM. However, for films in which SMDPPEH crystallization is induced by thermal annealing, significant differences in molecular packing between the different stereoisomer formulations are observed. These differences are borne out in photovoltaic device characteristics for which unannealed devices show very similar behavior, while after annealing the RR- and SS-SMDPPEH enantiomers show blue-shifted peak EQE relative to the SMDPPEH isomer mixtures. Unannealed devices made from the most crystalline stereoisomer, meso RS-SMDPPEH, are not completely amorphous, and show improved photocurrent generation as a result. Unlike the other compounds, after thermal annealing the RS-SMDPPEH devices show reduced device performance. The results reveal that the chirality of commonly used 2-ethylhexyl solubilizing chains can have a significant effect on the morphology, absorption, and optimum processing conditions of small molecule organic thin films used as photovoltaic device active layers.
A method for preparing different Xin thiol (by machine translation)
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Paragraph 0047; 0048; 0049; 0050; 0051, (2017/08/28)
The present invention relates to the field of fine chemicals, in particular relates to a process for preparing thiols different Xin, it adopts isooctanol, hexabromo, DMAP catalyst, thiourea, polyesters sodium solution, such as sulfuric acid the original supplementary material to brominated, condensation, hydrolysis reaction, after the reaction, then drying and rectification to get different Xin thiol finished product. The preparation method is simple, few steps, yield as high as 94.16%, and in the bromination reaction not introduced in phosphorus and bromine from participating in the reaction reduces the security risk coefficient. (by machine translation)
Efficient procedures to prepare primary and secondary alkyl halides from alkanols via the corresponding sulfonates under mild conditions
Cahiez, Gerard,Gager, Olivier,Moyeux, Alban,Delacroix, Thomas
supporting information; experimental part, p. 1519 - 1528 (2012/07/03)
The study presented herein shows that sulfonate/halide exchange can be advantageously performed in THF to avoid several side reactions such as elimination and epimerization when the reaction is performed from a chiral alkyl sulfonate or a substrate having a C-H acidic chiral center. The main limitation of this procedure was found to be the conversion of secondary alkyl sulfonates to alkyl chlorides. In this case, the addition of a catalytic amount of manganese chloride clearly accelerates the rate and the efficiency of the reaction. Copyright
