Polarization-sensitive ultraviolet (UV) photodetection is highly indispensable in military and civilian applications and has been demonstrated with various wide-band photodetectors. However, it still remains elusive to achieve the selfpowered devices, which can be operated in the absence of external bias. Herein, for the first time, ferroelectricity-driven self-powered photodetection towards polarized UV light was successfully demonstrated in a 2D wide-band gap hybrid ferroelectric (BPA) 2 PbBr 4 (BPA = 3-bromopropylammonium) (1). We found that the prominent spontaneous polarization in 1 results in a bulk photovoltaic effect (BPVE) of 0.85 V, that independently drives photoexcited carriers separation and transport and thus supports self-powered ability. This self-powered detector shows strong polarization sensitivity to linearly polarized UV illumination with a polarization ratio up to 6.8, which is superior to that of previously reported UVpolarized photodetectors (ZnO, GaN, and GeS 2). Polarization-sensitive photodetectors have attracted extensive attention owing to their remarkable polarization dependent optoelectronic properties. [1-3] Among them, polarizationsensitive ultraviolet (UV) photodetection capable of detecting polarized UV light is a significant branch of optoelectronics and has been adapted to various fields, ranging from communication, near field imaging, remote sensing, as well as to military surveillance. [4-9] During the past decades, most attention on polarization-sensitive UV photodetection was devoted to conventional wide band gap semiconductor medium with nanowire geometry, such as GaN [4] and ZnO. [5] Recently, anisotropic 2D semiconductor GeS 2 also has been demonstrated to be potential building element for UVpolarized detection due to the intrinsic anisotropic crystal structure. [10] However, an external power source was usually required as driving force in all above mentioned devices to separate the photogenerated carriers, which not only consumed energy but also largely increased the system size and integrated cost. Self-powered photodetectors represent a new type of candidate without external energy supply, which can

The polymorphs of (Z)-2-fluoro-N'-phenyl benzamidamide with multiple Z' produce quasi-isostructural supramolecular architectures, wherein C-H···F interaction plays a significant role. The energy framework analysis indicates 2D structural similarities in the interaction topologies of these crystalline forms. The results point to a unique class of 'quasi-isostructural polymorphs' which are nearly equi-energetic crystal structures exhibiting high degrees of similarity in physical properties.

A methodology involving a "transition metal-free" intramolecular biaryl-coupling of o-halo-N-arylbenzylamines has been developed in the presence of potassium tert-butoxide and an organic molecule as catalyst. The reaction appears to proceed through KO(t)Bu-promoted intramolecular homolytic aromatic substitution (HAS). Interestingly, this biaryl coupling also works in the presence of potassium tert-butoxide as sole promoter. On extending our approach further, we found that N-acyl 2-bromo-N-arylbenzylamines undergo a one-pot N-deprotection/biaryl coupling followed by oxidation, thus offering an expeditious route to the phenanthridine and benzo[c]phenanthridine skeletons. The strategy has been applied to a concise synthesis of Amaryllidaceae alkaloids viz. oxoassoanine (1b), anhydrolycorinone (1d), 5,6-dihydrobicolorine (2d), trispheridine (2b), and benzo[c]phenanthridines alkaloids dihydronitidine (3b), dihydrochelerythidine (3d), dihydroavicine (3f), nornitidine (3h), and norchelerythrine (3j).

We report an unusual intramolecular C-FO[double bond, length as m-dash]C and C-HCl-C parallel dipole-dipole alignment which "locks" the molecular conformation of cryocrystallized liquids towards planarity where the diatropic ring current establishes the existence of aromaticity in the five-membered ring associated with FO contact. Topological analysis establishes the bonding interaction between [F, O] and [H, Cl].