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The crystal structures of 1,2-dimethyl-3-indolylmethylidene succinic fulgide anhydride (1) and 1,2-dimethyl-3-indolylethylidene succinic fulgide anhydride(2) were determined by singe crystal X-ray diffraction analysis. The crystal data are C_(18)H_(17)NO_3(1), orthogonal space group Pbca, with a=1.0084(3) nm, b=1.3966(4) nm, c=2.0945(6) nm, V=2.9498(15) nm, Z=8; C_(19)H_(19)NO_3 (2), orthogonal space group Pbca, with a=0.7988(3) nm, b=2.5782(10) nm, c=1.5664(5) nm, V=3.2259(22) nm, Z=8. R values are 0. 047 for (1) and 0.059 for (2) respectively.The photochemical properties of (1) and (2) were reported. Compound (1) is nonphotochromic, compound (2) changed from pale yellow to blue or green on irradiation at 365 nm or on exposure to indoor UV light either in crystal state or in solution (liquid or rigid plastic matrix).The differences in photochromic properties of compound (1) and (2) were discussed. 相似文献
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氮杂俘精酸酐作为光致变色材料近年来已引起人们的极大兴趣,但其晶体结构数据还未见报导.测定它们的晶体结构,研究其结构与性能的关系,有着非常重要的意义.本文测定了标题化合物(Ⅰ)和(Ⅱ)的结构。实验1.从氯仿和石油醚的混合溶剂中培养出黄色单晶.在Nicolet R 3m/E 四圆衍射仪上收集衍射强度数据.用石墨单色器单色化的Mo Kα射线作辐射光源,以θ/2θ扫描方式收集2θ3~50°范围的数据.强度数据没有进行吸收校正.有关晶体数据列于表1中。 相似文献
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The crystal structures of the title compound (Ⅰ) and (Ⅱ) have been determined by X-ray diffraction. Crystal data are: C_(17)H_(15)NO_3(Ⅰ), triclinic, α=0.7308(2) nm, b=0.8845(3) nm, c=1.1323(3) nm, α=100.03(2)°, β=104.81(2)°, γ=97.20(2)°, V=0.6856(3) nm, Z=2, R=0.047 and C_(18)H_(17)NO_3(Ⅱ), monoclinic, a=1.1006(3) nm, b=1.1172(2) nm, c=1.4046(3) nm, β=102.78(2)°, V=1.5337(6) nm, Z=4, R=0.055. The molecular conformation is cis form for compound Ⅰ and trans form for compound(Ⅱ). 相似文献
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将螺二芴引入二芳基乙烯分子中,设计合成了一种新型的含螺二芴呋喃芳香杂环的二芳基乙烯光致变色分子7a.用FT-IR,NMR,MS和元素分析进行结构表征;研究了7a在正己烷溶液和乙腈溶液中的光致变色反应,结果表明7a在两种溶剂中均具有良好的光致变色性能.并且7a在正己烷溶液中变色速率和转化率比在乙腈溶液中大.还研究了7a光致变色过程中荧光光谱的变化,发现关环反应后荧光被淬灭,并且7a的荧光发射峰在极性溶剂中有很大的蓝移.研究了开环态7a,关环态7b的热稳定性,发现7a的热失重温度比未用螺二芴修饰的8a提高了100℃.7b的热稳定性也比8b高. 相似文献
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2,5-二(2-氨基乙氧甲基)噻吩合成及抑菌活性 总被引:2,自引:0,他引:2
噻吩烷基胺及其衍生物对疟疾、麻风、真菌、病毒和某些肿瘤均有较强的药理活性[1~ 2 ] ,因此合成和开发这类新物质具有重要的意义。以前 ,由 2 噻吩甲醛合成的噻吩类衍生物药物较多[3] ,但对噻吩双取代衍生物的合成研究还未引起重视。因此 ,为了探索这类化合物的性质和抑菌效果。我们合成了未见文献报道的 2 ,5 二 ( 2 氨基乙氧甲基 )噻吩 ,通过多种测试手段 ,确定了它的组成结构 ,其合成路线如下 :1 实验部分1 1 仪器与试剂Nicolet1 70S红外光谱仪 (KBr压片 ) ,PE 2 4 0C型元素分析仪 ,EM 360 60MHz核磁共振仪。… 相似文献
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报道俘精酸酐类化合物(E/Z)4-二环丙亚甲基-3-[1-(2,5-二甲基-3-呋喃基)亚乙基]四氢呋喃-2,5-酮的拆分,及(E)和(Z)-5-二氰亚甲基-4-二环丙亚甲基-3-[1-(2,5-二甲基-3-呋喃基)亚乙基]四氢呋喃-2-酮4(E)和4(Z)的合成,并对它们的光致变色特性进行了初步研究。 相似文献
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Fulgide 1-E doped in polystyrene polymer films was heated at various annealing temperatures.Upon irradiation with UV light(366 nm),fulgide 1-E undergoes a conrotatory ring closure to the pink colored closed form 1-C.The later color was switched back to the original color when the films were irradiated with white light.The kinetics of photocoloration and photobleaching processes were followed spectrophotometrically by monitoring the absorbance of the ring closed product 1-C at itsλ_(max) of 525 nm.The fir... 相似文献
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《结构化学》1985,(2)
<正> , Mr=248.28, monoclinic, P2!/n, a=ll.394(4), b=5.770(1), c=20.534(6) &, (3=106.09(2)? V=1297.1(4) X3, Z=4, 1^=1.265, Dx=l.271 Mgm'3, y(Moka)=0.87cm~1, F(000)=527.94, 295K. The structure was solved by direct methods and refined to R=0.057 for 1984 observed Moka reflections. The 1,3-dioxan-4,6-dione ring shows a twist-boat conformation with the a-phenylethyl group occupying a bow position. , . . 相似文献
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E. A. Dikusar V. I. Potkin S. K. Pyatkevich 《Russian Journal of General Chemistry》2014,84(9):1701-1705
Preparative method for the synthesis of lithium, sodium, cesium, and calcium salts of (E)-4-(5-arylisoxazol-3-yl)methyleneaminobutanoic, (E)-6-(5-arylisoxazol-3-yl)methyleneaminohexanoic, (E,S)-3-methyl-2-(5-arylisoxazol-3-yl)methyleneaminobutanoic, (E,S)-4-methyl-2-(5-arylisoxazol-3-yl)methyleneaminopentanoic and (E,2S,3S)-3-methyl-2-(5-arylisoxazol-3-yl)methyleneaminopentanoic acids was developed by reacting 5-phenyl(4-tolyl)isoxazole-3-carbaldehydes with amino acids like 4-aminobutyric and 6-aminocaproic acids, L-valine, L-leucine or L-isoleucine in the presence of lithium hydride, sodium methoxide, cesium carbonate or calcium hydride in boiling methanol. 相似文献
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Abdel-Sattar S. Hamad Dieter Schinzer 《Phosphorus, sulfur, and silicon and the related elements》2013,188(1):187-199
Abstract (R) and (S) of 2-Methy1-3-oxa-5-(tert-butyldiphenylsilyloxyl)methy1pentanoate (4a. 6a) and (R) and (S) of 2-methy1-3-oxa-5-(tert-butyldimethylsilyloxyl)methylpentanoate (4b, 6b) were synthesized by the reaction of the preparative compounds (2a, 2b) with (R) and (S) methy1lactate (3, 4) in the presence of a silver (1) oxide catalyst (Method B). The title compounds are useful for the synthesis of different natural products such as epothilones. 相似文献
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本文用时间分辨荧光光谱证实了萘与2,6-萘二甲酸二甲酯形成激基复合物。并结合稳态荧光光谱算出光物理过程的基元过程常数,讨论了结构与基元常数之间的关系。 相似文献
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Shin-ichi Takekuma Keisuke Nagata Yûsuke Yoshioka Hironori Obata Takaharu Minami Tomoyoshi Tanaka Keisuke Yashima Toshie Minematsu Hideko Takekuma 《Tetrahedron》2012,68(33):6737-6758
Wittig reactions of 2-furaldehyde (20) [and thiophene-2-carbaldehyde (21)] with (3-guaiazulenylmethyl)triphenylphosphonium bromide (19) in ethanol containing NaOEt at 25 °C for 24 h under argon give (E)-1-(2-furyl)-2-(3-guaiazulenyl)ethylene (22E) and (E)-1-(2-thienyl)-2-(3-guaiazulenyl)ethylene (23E) in 53 and 36% yields. Similarly, Wittig reactions of 3-furaldehyde (29) [and thiophene-3-carbaldehyde (30)] with 19 under the same reaction conditions as for 20 and 21 afford (E)-1-(3-furyl)-2-(3-guaiazulenyl)ethylene (31E) and (E)-1-(3-thienyl)-2-(3-guaiazulenyl)ethylene (32E) in 32 and 46% yields. Molecular structures and characteristic properties as well as preparation of the title E (i.e., one of the geometrical isomers) forms, with a view to comparative study, are reported. Moreover, reactions of those conjugated π-electron systems with TCNE (=tetracyanoethylene) in benzene [and in DMF (=N,N-dimethylformamide)] at 25 °C for 24 h under argon yield unique products, possessing interesting molecular structures, respectively, whose characteristic properties and crystal structures are documented, also. 相似文献