4-(17-tetrabenzo[a,c,g,i]fluorenylmethyl)-41′,4″-Dimethoxytrityl Chloride: A hydrophobic 5′-protecting group for the separation of synthetic oligonucleotides.
摘要:
A new highly hydrophobic 5'-hydroxyl protecting group (Tbf-DMTr) has been designed for the purification of synthetic oligonucleotides. Tbf-DMTr-oligonucleotides are strongly retained on RP-HPLC allowing a facile separation from truncated sequences. Subsequently the group can be removed in acidic conditions. The ultra-violet properties of Tbf-DMTr enable easy detection. The synthesis and purification of long oligonucleotides (> 100 mer) is envisaged.
Isothermal and non-isothermal cold crystallization of tetrabenzofluorene (TBF) molecules
作者:A. A. Boopathi、Srinivasan Sampath、T. Narasimhaswamy
DOI:10.1039/c8nj06514d
日期:——
Design and synthesis of tetrabenzo[a,c,g,i]fluorene (TBF) derivatives are carried out to investigate the isothermal and non-isothermal cold crystallization (CC) behavior by various spectroscopic and analytical techniques. The unprecedented CC exhibited by TBF molecules is examined by systematic modification of alkyl chain length (C8–C18 even carbons) on both sides of the central phenyl ring. The CC
设计并合成了四苯并[ a,c,g,i ]芴(TBF)衍生物,以通过各种光谱和分析技术研究等温和非等温冷结晶(CC)行为。通过系统性地修饰中心苯环两侧的烷基链长(C8–C18甚至碳原子),检查了TBF分子表现出的空前的CC。通过热阶段偏振显微镜(HOPM),差示扫描量热法(DSC)和可变温度粉末X射线衍射(VT-PXRD)检查TBF衍生物的CC 。实验观察表明,随着烷基链长度的增加,C 10 H 21到C 16 H 33时,CC温度和活化能显着提高。非等温CC活化能使用Kissinger方程计算。通过采用DSC动力学参数,可以计算出TBF分子(TBFC10至TBFC18)的总活化能,范围为62.18–90.35 kJ mol -1。此外,绘制了在五个不同温度下等温CC动力学的Avrami因子,这表明随着温度的升高,CC时间会减少。
“Bottom-up” self-assembly and “cold crystallization” of butterfly shaped tetrabenzofluorene molecules
作者:Srinivasan Sampath、A. A. Boopathi、A. B. Mandal
DOI:10.1039/c6cp02662a
日期:——
Butterfly-shaped tetrabenzo[a,c,g,i]fluorene (TBF)-based molecules (1 and 2) were designed, synthesized and well characterized using various spectroscopic techniques. The single crystal X-ray structure of 1 shows the presence of intermolecular 3-D π–π stacking interaction and unprecedented “cold crystallization” in polycyclic aromatic molecules. We report for the first time, the “bottom-up” self-assembly
Remarkable stability of tetrabenzo[a,c,g,i]fluorenyl ammonium salts in water: syntheses, reactions, and crystal structures
作者:Okko N. Frey、Timo Stalling、Florian Schlüter、Wolfgang Saak、Marc Schmidtmann、Detlev Haase、Rüdiger Beckhaus
DOI:10.1039/c5dt04137f
日期:——
Deprotonation of 8bH-tetrabenzo[a,c,g,i]fluorene (8bH-Tbf), an extremely large benzannulated cyclopentadienyl derivative, by [NR3R′][OH] (R = nBu, Et; R′ = nBu, Et, Bn) leads to a series of Tbf ammonium salts of the type [NR3R′][Tbf]. These cyclopentadienide analogs were smoothly isolated from a hydrous medium and structurally characterized by single X-ray diffraction. Subsequent reactions demonstrate
[NR 3 R'] [OH]使8b H-四苯并[ a,c,g,i ]芴(8b H -Tbf)(一个很大的苯环环戊二烯基衍生物)去质子化(R = n Bu,Et; R' = n Bu,Et,Bn)生成一系列[NR 3 R'] [Tbf]类型的Tbf铵盐。这些环戊二烯类似物从含水介质中顺利分离出来,并通过单X射线衍射对其结构进行了表征。随后的反应通过将提出的[Tbf]阴离子转化为官能化的Tbf化合物,证明了很高的衍生化潜力。
10.1002/chem.202401647
作者:Navya, Panichiyil V.、Ganesan, Krithika、Neyts, Erik C、Sampath, Srinivasan
DOI:10.1002/chem.202401647
日期:——
synthesized by functionalizing tetrabenzofluorene core with acceptor units, without using heterocyclic rings and amine derivatives. These molecules can switch color from pale yellow to dark hues and also display electrofluorochromism. Smart windows fabricated using these electrochromes can store the injected energy and the stored energy can be reused to charge electronic gadgets.