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Impact of the anion and chalcogen on the crystal structure and properties of 4,6-dimethyl-2-pyrimido(thio)nium halides.
Acta Crystallographica Section C ( IF 0.7 ) Pub Date : 2020-04-24 , DOI: 10.1107/s2053229620005525
Andrzej Okuniewski 1 , Damian Rosiak 1 , Jarosław Chojnacki 1
Affiliation  

By the reaction of urea or thiourea, acetylacetone and hydrogen halide (HF, HBr or HI), we have obtained seven new 4,6‐dimethyl‐2‐pyrimido(thio)nium salts, which were characterized by single‐crystal X‐ray diffraction, namely, 4,6‐dimethyl‐2‐oxo‐2,3‐dihydropyrimidin‐1‐ium bifluoride, C6H9N2O+·HF2 or (dmpH)F2H, 4,6‐dimethyl‐2‐oxo‐2,3‐dihydropyrimidin‐1‐ium bromide, C6H9N2O+·Br or (dmpH)Br, 4,6‐dimethyl‐2‐oxo‐2,3‐dihydropyrimidin‐1‐ium iodide, C6H9N2O+·I or (dmpH)I, 4,6‐dimethyl‐2‐oxo‐2,3‐dihydropyrimidin‐1‐ium iodide–urea (1/1), C6H9N2O+·I·CH4N2O or (dmpH)I·ur, 4,6‐dimethyl‐2‐sulfanylidene‐2,3‐dihydropyrimidin‐1‐ium bifluoride–thiourea (1/1), C6H9N2S+·HF2·CH4N2S or (dmptH)F2H·tu, 4,6‐dimethyl‐2‐sulfanylidene‐2,3‐dihydropyrimidin‐1‐ium bromide, C6H9N2S+·Br or (dmptH)Br, and 4,6‐dimethyl‐2‐sulfanylidene‐2,3‐dihydropyrimidin‐1‐ium iodide, C6H9N2S+·I or (dmptH)I. Three HCl derivatives were described previously in the literature, namely, 4,6‐dimethyl‐2‐oxo‐2,3‐dihydropyrimidin‐1‐ium chloride, (dmpH)Cl, 4,6‐dimethyl‐2‐sulfanylidene‐2,3‐dihydropyrimidin‐1‐ium chloride monohydrate, (dmptH)Cl·H2O, and 4,6‐dimethyl‐2‐sulfanylidene‐2,3‐dihydropyrimidin‐1‐ium chloride–thiourea (1/1), (dmptH)Cl·tu. Structural analysis shows that in 9 out of 10 of these compounds, the ions form one‐dimensional chains or ribbons stabilized by hydrogen bonds. Only in one compound are parallel planes present. In all the structures, there are charge‐assisted N+—H…X hydrogen bonds, as well as weaker CAr+—H…X and π+X interactions. The structures can be divided into five types according to their hydrogen‐bond patterns. All the compounds undergo thermal decomposition at relatively high temperatures (150–300 °C) without melting. Four oxopyrimidinium salts containing a π+X…π+ sandwich‐like structural motif exhibit luminescent properties.

中文翻译:

阴离子和硫族元素对4,6-二甲基-2-嘧啶(硫)nium卤化物的晶体结构和性能的影响。

通过尿素或硫脲,乙酰丙酮和卤化氢(HF,HBr或HI)的反应,我们获得了7种新的4,6-二甲基-2-嘧啶(硫)鎓盐,其特征是单晶X射线衍射,即,4,6-二甲基-2-氧代-2,3-二氢嘧啶-1-鎓二氟化物,C 6 H ^ 9 ñ 2 ö + ·HF 2 -或(dmpH)的F 2 H,4,6-二甲基-2-氧代-2,3-二氢嘧啶-1-鎓溴化物,C 6 H ^ 9 ñ 2 ö + ·溴-或(dmpH)溴,4,6-二甲基-2-氧代-2,3-二氢嘧啶-1碘化碳,C 6 H 9 N 2 O +·I -或(dmpH)I,4,6-二甲基-2-氧代-2,3-二氢嘧啶-1-鎓碘化物-脲(1/1),C 6 H ^ 9 Ñ 2 ö + ·I - ·CH 4 N 2 O或(dmpH)I·ur,4,6-二甲基-2-亚磺酰亚基-2,3-二氢嘧啶-1-氟化氢-硫脲(1/1),C 6 H 9 N 2 S + ·HF 2 ·CH 4 N 2 S或(dmptH)F 2 H·tu,4,6-二甲基-2-亚磺酰亚基-2,3-二氢嘧啶-1-溴化溴,C 6 H 9 N 2 S + ·Br-或(dmptH)Br和4,6-二甲基-2-亚硫烷基-2,3-二氢嘧啶-1-鎓碘化物,C 6 H ^ 9 Ñ 2小号+ ·I -或(dmptH)予。先前在文献中描述了三种HCl衍生物,分别是4,6-二甲基-2-氧代-2-,3-二氢嘧啶-1-氯,(dmpH)Cl,4,6-二甲基-2-磺酰亚砜2, 3-二氢嘧啶-1-氯一水合物(dmptH)Cl·H 2O和4,6-二甲基-2-亚磺酰基-2,3-二氢嘧啶-1-氯氯化物-硫脲(1/1),(dmptH)Cl·tu。结构分析表明,在10种化合物中,有9种离子形成了氢键稳定的一维链或带。仅在一种化合物中存在平行平面。在所有的结构中,有电荷辅助Ñ + -H ... X -氢键,以及弱C ^的Ar + -H ... X -和π + ... X -互动。根据其氢键模式,可以将结构分为五种类型。所有化合物在相对较高的温度(150–300°C)下都会发生热分解而不会熔化。含有π四克oxopyrimidinium盐+ ... X - ...π +夹层状结构基序呈现发光性能。
更新日期:2020-04-24
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