Polymorphs of Green Fluorescence Protein Chromophore Analogue: Fluorescence Switching with Thermal Stimuli
作者:Bhupendra P. Mali、Soumya Ranjan Dash、Anupam Biswas、Kumar Vanka、Kochunnoonny Manoj、Rajesh G. Gonnade
DOI:10.1021/acs.cgd.1c01459
日期:2022.3.2
material). Forms I and II are the outcome of solution crystallization, whereas FormIII was produced from the melt crystallization of Forms I and II. DSC, HSM, and powder and single-crystal XRD studies indicate the conversion of Form I and FormIII crystals to Form II crystals on thermal stimuli. The photoluminescence studies revealed cyan, yellow, and yellowish-green fluorescence emission for Forms I, II
荧光有机材料的多晶型物在光电子学和先进材料中具有重要意义,因为它们可以调节光致发光特性。晶体中分子的构象/堆积的轻微变化表明光致发光的变化。这需要对这些材料进行多晶型筛选,以开发具有不同荧光发射的新型晶体形式,以实现更广泛的应用。在继续我们对绿色荧光蛋白发色团 (GFPc) 的多晶型筛选工作的过程中,我们合成了一种新的咪唑啉衍生物,乙基 ( Z )-2-(2-methyl-5-oxo-4-(3,4,5 -三甲氧基亚苄基)-4,5-二氢-1H-咪唑-1-基)乙酸酯( 1 )。1的多晶型筛选在不同的结晶条件下显示出三种多晶型物,I 型(针状)、II 型(块状)和 III 型(多晶材料)。I型和II型是溶液结晶的产物,而III型是由I型和II型的熔融结晶产生的。DSC、HSM 以及粉末和单晶 XRD 研究表明 I 型和 III 型晶体在热刺激下转化为 II 型晶体。光致发光研究分别揭示了 I、II
Synthesis of Highly Substituted Pyrrolidines Through 1,3-Dipolar Cycloaddition Reaction of<i>N</i>-Metalated Azomethine Ylides with Triarylideneacetylacetone as Dipolarophile Using Titanocene Dichloride
Abstract The 1,3-dipolarcycloadditionreaction of tryarylideneacetyacetone derivatives with N-metalated azomethineylides in the presence of titanocene dichloride and triethylamine has been investigated. This two-step synthetic sequence is very efficient and yielded the highlysubstitutedpyrrolidines in good yields. The structure and stereochemistry of one of the products has been established by
摘要 研究了在二氯化钛和三乙胺存在下,三亚甲基乙酰丙酮衍生物与 N-金属化偶氮甲碱叶立德的 1,3-偶极环加成反应。这种两步合成序列非常有效并且以良好的产率产生了高度取代的吡咯烷。其中一种产品的结构和立体化学已通过单晶 X 射线结构和光谱技术确定。