boron and boron-trifluoride

A series of new triphenylamine functionalized β-diketones 1–3 and their difluoroboron complexes 1B–3B were synthesized. They exhibited strong intramolecular charge transfer (ICT) emission. It was found that their self-assembling properties depended on the molecular structures. For example, compounds 1 and 1B, in which only one β-diketone or difluoroboron β-diketone unit was linked to triphenylamine, showed better gelation abilities directed by π–π interaction. Although bis-β-diketone substituted triphenylamine 2 could not form organogels, its difluoroboron complex 2B could gel DMSO due to the strong dipole–dipole interactions. Compound 3 could form gels in polar solvents, while 3B formed gels in nonpolar solvents. Notably, the asymmetric gelators 1, 1B and 2B exhibited AIEE behaviors during the gelation. Although the emission of the symmetric compounds 3 and 3B decreased to a certain degree upon gelation, the obtained gels still gave strong emission. The gels formed from 1 and 3 emitted strong green light and those based on 1B–3B emitted strong orange or red light. These highly luminescent materials might have potential applications in emitting devices and fluorescent sensors.

Topics: Amines; Boranes; Boron; Coloring Agents; Computer Simulation; Ethers; Fluorescent Dyes; Fluorine; Gels; Ketones; Ligands; Light; Luminescence; Magnetic Resonance Spectroscopy; Oscillometry; Solvents; Spectrometry, Fluorescence; Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization; Spectrophotometry, Ultraviolet; Spectroscopy, Fourier Transform Infrared; Temperature; Ultraviolet Rays; X-Ray Diffraction

Three novel Cu(I)-C2H4 adducts bearing 4-(2-pyridyl)pyrimidine were self-assembled, and the roles of anion and solvent were proved in the formation process.

Topics: Anions; Boranes; Boron; Chemistry; Copper; Crystallography, X-Ray; Ethylenes; Fluorides; Magnetic Resonance Spectroscopy; Metals; Models, Chemical; Molecular Conformation; Molecular Structure; Polymers; Solvents; Thermogravimetry

The (1)J((11)B(19)F) spin-spin coupling of gaseous BF(3) was observed in (11)B NMR spectra as a function of density in a wide range of temperatures. Following the extrapolation of the measured values to the zero-density limit, the coupling constant free from intermolecular effects (1)J(0)((11)B(19)F) was obtained for each temperature. In contrast to previous investigations, the final results indicate a nonlinear dependence of (1)J(0)((11)B(19)F) on temperature. In the corresponding ab initio calculations of spin-spin coupling constants performed at the coupled cluster singles and doubles (CCSD) level to obtain a reliable result for this coupling constant we had to take into account large vibrational corrections.

Topics: Boranes; Boron; Fluorides; Magnetic Resonance Spectroscopy; Quantum Theory; Reference Standards; Temperature

Two acrylic cube phantoms have been constructed for BNCT applications that allow the depth distribution of neutrons to be measured with miniature 10BF3 detectors in 0.5-cm steps beginning at 1-cm depth. Sizes and weights of the cubes are 14 cm, 3.230 kg, and 11 cm, 1.567 kg. Tests were made with the epithermal neutron beam from the patient treatment port of the Brookhaven Medical Research Reactor. Thermal neutron depth profiles were measured with a bare 10BF3 detector at a reactor power of 50 W, and Cd-covered detector profiles were measured at a reactor power of 1 kW. The resulting plots of counting rate versus depth illustrate the dependence of neutron moderation on the size of the phantom. But more importantly the data can serve as benchmarks for testing the thermal and epithermal neutron profiles obtained with accelerator-based BNCT facilities. Such tests could be made with these phantoms at power levels about five orders of magnitude lower than that required for the treatment of patients with brain tumors.

Topics: Biophysical Phenomena; Biophysics; Boranes; Boron; Boron Neutron Capture Therapy; Brain Neoplasms; Equipment Design; Fast Neutrons; Humans; Isotopes; Phantoms, Imaging

Topics: Boranes; Boron; Chemical Phenomena; Chemistry; Esterification; Ethanol; Fats, Unsaturated; Fatty Acids; Fatty Acids, Unsaturated; Fluorides; Methanol; Research

Topics: Boranes; Boron; Chalcones; Fluorides; Propiophenones

Topics: Animals; Animals, Laboratory; Boranes; Boron; Fluorides