Synthesis,Photo-physical Properties and Cell Imaging of Meso-2,6-dichlorophenyl Boron-dipyrromethene Derivatives

The meso-2,6-dichlorophenyl boron-dipyrromethene(BODIPY) derivative 1 was synthesized and characterized by single-crystal X-ray diffraction analysis, 1 H NMR and Esi-HRMS. Compound 1 crystallizes in monoclinic, space group P21/n with a = 8.717(4), b = 20.938(9), c = 12.402(6) ?, β = 98.660(7)°, V = 2237.7(17) ?3, D3 c = 1.333 Mg/cm, F(000) = 936, μ = 0.319 –mm1, Z = 4, the final R = 0.0537 and wR = 0.1556 for 5064 observed reflections with I 2ζ(I). Its photophysical properties were investigated by fluorescence and UV-Vis spectrum. 1 shows high fluorescence quantum yield in different solvents and poor solvent effect. In addition, compound 1 has high values of initial decomposition temperature(298 ℃). Moreover, cell imaging experiments showed 1 is promising for further bioimaging applications.     

Band alignment of Ga2O3/6H-SiC heterojunction

A high-quality Ga₂O₃ thin film is deposited on an SiC substrate to form a heterojunction structure. The band alignment of the Ga₂O₃/6H-SiC heterojunction is studied by using synchrotron radiation photoelectron spectroscopy. The energy band diagram of the Ga₂O₃/6H-SiC heterojunction is obtained by analysing the binding energies of Ga 3d and Si 2p at the surface and the interface of the heterojunction. The valence band offset is experimentally determined to be 2.8 eV and the conduction band offset is calculated to be 0.89 eV, which indicate a type-II band alignment. This provides useful guidance for the application of Ga₂O₃/6H-SiC electronic devices.