C 36 H 46 ,triclinic, P 1 (no.2), a =9.346(1)Å, b =13.871(2)Å, c =19.126(2) Å, a =109.770Source of material 1.0g( 0.004 mol) 6,12-dihydroindeno[1,2b ]fluorene, 20 mL DMSO and 1.0 g(0.018 mol) KOH are added into a100 mLflask.Then 2.6 mL(0.024mol) 1-bromobutane wasadded dropwise with stirring atroom temperature.The mixturewascontinuously stirred for overnight.The reaction solution waspoured into 100 mLdistilled water and wasextracted with dichloromethane.The organic phase wasw ashed with distilled water and dried with Mg 2 SO 4 ,before it wasconcentrated.The solvent wasevaporated and the residue waspurified by column chromatography on silica gel using petroleum ether aseluent.Colorless solid (yield 83 %, 1.6 g) wasobtained.Asample forthe structure analysis wasobtained by recrystallizationfrom hexane. 1 HNMR are availablein the CIF.
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
Stretchable and flexible sensors attached onto the surface of the human body can perceive external stimuli, thus attracting extensive attention due to their lightweight, low modulus, low cost, high flexibility, and stretchability. Recently, a myriad of efforts have been devoted to improving the performance and functionality of wearable sensors. Herein, this review focuses on recent remarkable advancements in the development of flexible and stretchable sensors. Multifunction of these wearable sensors is realized by incorporating some desired features (e.g., self-healing, self-powering, linearity, and printing). Next, focusing on the characteristics of carbon nanomaterials, nanostructured metal, conductive polymer, or their hybrid composites, two major strategies (e.g., materials that stretch and structures that stretch) and diverse design approaches have been developed to achieve highly flexible and stretchable electrodes. Strain sensing performances of recently reported sensors indicate that the appropriate choice of geometric engineering as well as intrinsically stretchable materials is essential for high-performance strain sensing. Finally, some important directions and challenges of a fully sensor-integrated wearable platform are proposed to realize their potential applications for human motion monitoring and human–machine interfaces.
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