Six coordination compounds of Pt(Ⅱ)L_2 and Ir(Ⅲ)L_3 type(where L is PT^-, 3Me-PT^-or 4Me-PT^-)are reported here.Four coordination compounds of the latter two ligands have never been reported before,while PT^-'s ...Six coordination compounds of Pt(Ⅱ)L_2 and Ir(Ⅲ)L_3 type(where L is PT^-, 3Me-PT^-or 4Me-PT^-)are reported here.Four coordination compounds of the latter two ligands have never been reported before,while PT^-'s were synthesized with H_2PtCl_6 and(NH_4)_3IrCl_6 respectively,which were different from the methods of Davidson et al.~1 and Sterinbrech^2.They were characterized by elemental analysis, UV,IR,~1HNMR and molar conductance.Their structural formulas have been determined,and the mechanism of synthetic reaction has been discussed.展开更多
In recent years, the narrow bandgap antimonide based compound semiconductors (ABCS) are widely regarded as the first candidate materials for fabrication of the third generation infrared photon detectors and integrated...In recent years, the narrow bandgap antimonide based compound semiconductors (ABCS) are widely regarded as the first candidate materials for fabrication of the third generation infrared photon detectors and integrated circuits with ultra-high speed and ultra-low power consumption. Due to their unique bandgap structure and physical properties, it makes a vast space to develop various novel devices, and becomes a hot research area in many developed countries such as USA, Japan, Germany and Israel etc. Research progress in the preparation and application of ABCS materials, existing problems and some latest results are briefly introduced.展开更多
Using the method of IR spectroscopy it was ascertained that in pectinates and alginates of polyvalent metals the coordination bonds between cations Pb2+, Cu2+, Zn2+, Cr3+, Mn2+, Fe2+, Co2+, Ni2+ and the oxygen atoms o...Using the method of IR spectroscopy it was ascertained that in pectinates and alginates of polyvalent metals the coordination bonds between cations Pb2+, Cu2+, Zn2+, Cr3+, Mn2+, Fe2+, Co2+, Ni2+ and the oxygen atoms of carboxyl and hydroxyl groups, pyranose cycle and glycosidic linkage of polyuronides, the water molecules are formed. It was also ascertained that Cu2+ cations form asymmetrical structures with carboxyl groups of polyuronides (monodentate ligands) and cations of other metals—symmetrical structures with carboxyl groups of polyuronides (bidentate ligands).展开更多
The title compound (C_ 24H_ 40Cl_6O_ 16V_3, M_r = 950.08) was synthesized from the reaction of VCl_3 and NaO_2CEt in CHCl_3 and THF. The crystal structure has been determined by X-ray single-crystal diffraction ana...The title compound (C_ 24H_ 40Cl_6O_ 16V_3, M_r = 950.08) was synthesized from the reaction of VCl_3 and NaO_2CEt in CHCl_3 and THF. The crystal structure has been determined by X-ray single-crystal diffraction analysis. It crystallizes in monoclinic space group C2/c with a = 12.5768(4), b= 16.5601(4), c = 19.3574(7) , β = 99.879(1)°, V = 3971.3(2)3, D_c = 1.589 g/cm3, μ= 1.157 mm -1, F(000)=1932, Z=4, R = 0.055, wR = 0.1539 (I2σ(I)). This compound has an unusual coplanar V_3O core with a C_2 axis passing through O(1), V(1), O(10): one V-μ_3O is short (1.628 ), the other two are longer (2.381 ). It was characterized by IR, 1H NMR, and EPR spectra. It was unstable and the decomposition process of this compound was studied using IR spectroscopy.展开更多
Photochemical reactions of 3-methylindole,carbazole,benzimidazole with fused polycyclic aromatic hydrocarbons in solid state were investigated,The structures of 4 new compounds were confirmed by IR,UV,\+1HNNR,MS and e...Photochemical reactions of 3-methylindole,carbazole,benzimidazole with fused polycyclic aromatic hydrocarbons in solid state were investigated,The structures of 4 new compounds were confirmed by IR,UV,\+1HNNR,MS and elemental analysis.The structure of compounds 3.6 was established by X-ray crystallography.展开更多
Equilibrium photoproduct of 7r-cyclopentadienyliron dicarbonyl dimer [CpFe（CO）2]2 in non- polar solvent carbon tetrachloride （CC14） is investigated using time-resolved 2D IR spec- troscopy. One of the several poss...Equilibrium photoproduct of 7r-cyclopentadienyliron dicarbonyl dimer [CpFe（CO）2]2 in non- polar solvent carbon tetrachloride （CC14） is investigated using time-resolved 2D IR spec- troscopy. One of the several possible visible-light-driven photoreaction pathways is confirmed and the product is found to contain a di-carbonyl group that exhibits quantum beating be- tween two equivalent transitions in time-resolved 2D IR spectra, which turns out to be the anti-symmetric and symmetric stretching of the terminal carbonyl stretching modes of CpFe（CO）2C1. This is the main product and its reaction pathway involves radical formation, followed by chloride addition. Quantum-chemistry computations support these experimental results. Our results indicate that 2D IR method can be used to identify in situ structures and dynamics of chemical species involved in condensed-phase chemical reactions.展开更多
The new requirements from the 5<sup>th</sup> and the 6<sup>th</sup> generation of wireless communication are ultra-high data rate, energy efficiency, wide coverage and connectivity, high reliab...The new requirements from the 5<sup>th</sup> and the 6<sup>th</sup> generation of wireless communication are ultra-high data rate, energy efficiency, wide coverage and connectivity, high reliability, and low latency. The current technologies cannot achieve all the mentioned requirements. New technologies and new approaches for deploying more active and passive nodes must be developed. Furthermore, the use of MMW band and THz band (30 - 300 GHz), in order to utilize their huge bandwidth, results in deploying more active node and more antennas due to high propagation losses and “LOS” behavior at this band. Development of innovative technologies is necessary to realize the above demand for growth of future wireless communication. The main task is to suggest solutions for the time varying characteristic of the wireless channel due to the user mobility and shadowing or blocking of communication channel. The current methods such as use of pilot channel to estimate the fading, various modulation or coding and beamforming, have overhead and limitations over random (large, unexpected changes) channels.展开更多
文摘Six coordination compounds of Pt(Ⅱ)L_2 and Ir(Ⅲ)L_3 type(where L is PT^-, 3Me-PT^-or 4Me-PT^-)are reported here.Four coordination compounds of the latter two ligands have never been reported before,while PT^-'s were synthesized with H_2PtCl_6 and(NH_4)_3IrCl_6 respectively,which were different from the methods of Davidson et al.~1 and Sterinbrech^2.They were characterized by elemental analysis, UV,IR,~1HNMR and molar conductance.Their structural formulas have been determined,and the mechanism of synthetic reaction has been discussed.
文摘In recent years, the narrow bandgap antimonide based compound semiconductors (ABCS) are widely regarded as the first candidate materials for fabrication of the third generation infrared photon detectors and integrated circuits with ultra-high speed and ultra-low power consumption. Due to their unique bandgap structure and physical properties, it makes a vast space to develop various novel devices, and becomes a hot research area in many developed countries such as USA, Japan, Germany and Israel etc. Research progress in the preparation and application of ABCS materials, existing problems and some latest results are briefly introduced.
文摘Using the method of IR spectroscopy it was ascertained that in pectinates and alginates of polyvalent metals the coordination bonds between cations Pb2+, Cu2+, Zn2+, Cr3+, Mn2+, Fe2+, Co2+, Ni2+ and the oxygen atoms of carboxyl and hydroxyl groups, pyranose cycle and glycosidic linkage of polyuronides, the water molecules are formed. It was also ascertained that Cu2+ cations form asymmetrical structures with carboxyl groups of polyuronides (monodentate ligands) and cations of other metals—symmetrical structures with carboxyl groups of polyuronides (bidentate ligands).
文摘The title compound (C_ 24H_ 40Cl_6O_ 16V_3, M_r = 950.08) was synthesized from the reaction of VCl_3 and NaO_2CEt in CHCl_3 and THF. The crystal structure has been determined by X-ray single-crystal diffraction analysis. It crystallizes in monoclinic space group C2/c with a = 12.5768(4), b= 16.5601(4), c = 19.3574(7) , β = 99.879(1)°, V = 3971.3(2)3, D_c = 1.589 g/cm3, μ= 1.157 mm -1, F(000)=1932, Z=4, R = 0.055, wR = 0.1539 (I2σ(I)). This compound has an unusual coplanar V_3O core with a C_2 axis passing through O(1), V(1), O(10): one V-μ_3O is short (1.628 ), the other two are longer (2.381 ). It was characterized by IR, 1H NMR, and EPR spectra. It was unstable and the decomposition process of this compound was studied using IR spectroscopy.
文摘Photochemical reactions of 3-methylindole,carbazole,benzimidazole with fused polycyclic aromatic hydrocarbons in solid state were investigated,The structures of 4 new compounds were confirmed by IR,UV,\+1HNNR,MS and elemental analysis.The structure of compounds 3.6 was established by X-ray crystallography.
文摘Equilibrium photoproduct of 7r-cyclopentadienyliron dicarbonyl dimer [CpFe（CO）2]2 in non- polar solvent carbon tetrachloride （CC14） is investigated using time-resolved 2D IR spec- troscopy. One of the several possible visible-light-driven photoreaction pathways is confirmed and the product is found to contain a di-carbonyl group that exhibits quantum beating be- tween two equivalent transitions in time-resolved 2D IR spectra, which turns out to be the anti-symmetric and symmetric stretching of the terminal carbonyl stretching modes of CpFe（CO）2C1. This is the main product and its reaction pathway involves radical formation, followed by chloride addition. Quantum-chemistry computations support these experimental results. Our results indicate that 2D IR method can be used to identify in situ structures and dynamics of chemical species involved in condensed-phase chemical reactions.
文摘The new requirements from the 5<sup>th</sup> and the 6<sup>th</sup> generation of wireless communication are ultra-high data rate, energy efficiency, wide coverage and connectivity, high reliability, and low latency. The current technologies cannot achieve all the mentioned requirements. New technologies and new approaches for deploying more active and passive nodes must be developed. Furthermore, the use of MMW band and THz band (30 - 300 GHz), in order to utilize their huge bandwidth, results in deploying more active node and more antennas due to high propagation losses and “LOS” behavior at this band. Development of innovative technologies is necessary to realize the above demand for growth of future wireless communication. The main task is to suggest solutions for the time varying characteristic of the wireless channel due to the user mobility and shadowing or blocking of communication channel. The current methods such as use of pilot channel to estimate the fading, various modulation or coding and beamforming, have overhead and limitations over random (large, unexpected changes) channels.
