Tuning the dielectric response by co-crystallisation of sumanene and its fluorinated derivative

Abstract

A series of co-crystals of 1,1-difluorosumanene (F2-Sum) and sumanene (Sum) were obtained. The co-crystallization successfully turned their structural and physical properties especially the dielectric response without any chemical modification. X-ray...

Molecular Design of a Metal-Nitrosyl Ferroelectric with Reversible Photoisomerization

“…Notably, ε″ shows two distinct dielectric relaxation processes in the frequency range below T 1 (Figure S5), ascribed to the dynamic rotational motion of the DMA cation in LTP. The dielectric response is reproducible under a reverse cooling process (Figure S6), confirming the intrinsic orientational polarization of the polar organic molecules …”

“…The dielectric response is reproducible under a reverse cooling process (Figure S6), confirming the intrinsic orientational polarization of the polar organic molecules. 64 To demonstrate the room-temperature bulk ferroelectricity of 1, electric polarization versus electric field (P−E) hysteresis loops were measured on a single crystal using a Sawyer−Tower circuit, with varying electric fields parallel to the b-axis (Figure S7). As shown in Figure 3b, a well-defined rectangular loop with a maximum saturated polarization (P s ) of 7.6 μC cm −2 and a coercive field (E c ) of 8.1 kV/cm were observed for applied AC electric fields up to 16.6 kV/cm at frequency 1 Hz.…”

Biased Bowl-Direction of Monofluorosumanene in the Solid State

“…Recently, our focus has been on studying fluorine-introduced buckybowls, − especially fluorosumanenes − from both structural and application viewpoints. The salient feature of these compounds is that they form isostructural single crystals of pristine sumanene. , Particularly intriguing is the instance of difluorosumanene ( F2-Sum ), where two fluorine atoms are on a single benzylic carbon site.…”

Synthesis and Interlayer Assembly of a Graphenic Bowl with Peripheral Selenium Annulation

“…Bowl-shaped nanocarbons are a segment of curved carbon nanomaterials that include fullerenes, carbon nano-onions, and the cap of carbon nanotubes. − As a result of their asymmetrical π-conjugated systems, bowls exhibit intriguing properties such as chirality, − dynamic bowl inversion, − ferroelectricity, − and supramolecular recognition. − The key to achieving the bowl shape is the incorporation of pentagons into the carbon skeleton. , Structurally, the pentagons are located at the inner core of the carbon skeleton, as in the case of corannulene, − which is different from the honeycomb network of graphene . Alternatively, the construction of pentagons at the periphery of the carbon backbone can result in a bowl-shaped structure without the destruction of graphenic networks. , For example, the bowl-shaped molecule, sumanene, , is composed of a triphenylene core and three pentagons at the periphery of the triphenylene (Figure ).…”