Synthesis and chemical–optical characterization of novel two-photon fluorescent borinates derived from Schiff bases

Supramolecular Ni(II)-Selective Gel Assembly toward Construction of a Schottky Barrier Diode

A mechanically stable and thermo-irreversible supramolecular Ni(II)-selective gel (MG) has been developed by utilizing the N,O-donor Schiff base (E)-1-((4-(diethylamino)phenylimino)-methyl)naphthalen-2-ol (HL) gelator and Et3N in binary THF:CH3OH (1:1) solutions at room temperature (rt). Metallogel MG has been characterized by spectral and analytical techniques, i.e., ESI-MS, FT-IR, NMR (1H & 13C), powder-XRD, FE-SEM, and rheological analysis. Further, noncovalent interactions responsible for the gelation mechanism have been illustrated with the aid of powder-XRD and FE-SEM analysis. The toughness, viscoelasticity, and flow behavior of MG were explored through rheological studies. Rheological and compressive measurements showed higher values of storage modulus and rigidity of MG; however, the flow property along with enrichment of toughness in MG can be an analytical metric for various engineering and industrial applications. Eventually, a Schottky barrier diode (SBD) was successfully constructed to mimic the functionality of MG-based metal-semiconductor (MS) junction devices for possible application in electrical engineering.

Protection of the Benzoxaborole Moiety: Synthesis and Functionalization of Zwitterionic Benzoxaborole Complexes

The synthesis and utility of three benzoxaborole protecting groups are reported. These protecting groups improve organic solubility and allow otherwise incompatible reactions (oxidations, substitutions, and mild reductions) to be achieved in the presence of the benzoxaborole moiety. 3-( N, N-Dimethylamino)-1-propanol was determined to be useful in one-step sequences and is readily cleaved upon workup. Two other groups, N-methylsalicylidenimine and 2-[1-(methylimino)ethyl]phenol, are suitable for multistep syntheses. Deprotection with mild aqueous acid allows for chromatography-free isolation of the benzoxaborole in high yields.

Detection of boronic acid derivatives in cells using a fluorescent sensor

The detection of boron-containing compounds requires very expensive facilities and/or tedious sample pretreatments. In an effort to develop a convenient detection method for boronic acid derivatives, boron chelating-ligands were synthesized for use as fluorescent sensors. In this paper, the synthesis and properties of fluorescent sensors for boronic acid derivatives are reported.

Synthesis, spectroscopic and catalytic properties of some new boron hybrid molecule derivatives by BF2 and BPh2 chelation

A new series of Schiff base ligands (L1-L3) and their corresponding fluorine/phenyl boron hybrid complexes [LnBF2] and [LnBPh2] (n=1, 2 or 3) have been synthesized and well characterized by both analytical and spectroscopic methods. The Schiff base ligands and their corresponding fluorine/phenyl boron hybrid complexes have been characterized by NMR ((1)H, (13)C and (19)F), FT-IR, UV-Vis, LC-MS, and fluorescence spectroscopy as well as melting point and elemental analysis. The fluorescence efficiencies of phenyl chelate complexes are greatly red-shifted compared to those of the fluorine chelate analogs based on the same ligands, presumably due to the large steric hindrance and hard π→π(∗) transition of the diphenyl boron chelation, which can effectively prevent molecular aggregation. The boron hybrid complexes were applied to the transfer hydrogenation of acetophenone derivatives to 1-phenylethanol derivatives in the presence of 2-propanol as the hydrogen source. The catalytic studies showed that boron hybrid complexes are good catalytic precursors for transfer hydrogenation of aromatic ketones in 0.1M iso-PrOH solution. Also, we have found that both steric and electronic factors have a significant impact on the catalytic properties of this class of molecules.