The Langmuir-Blodgett (LB) technique was used for studying enhanced lumines-cence of Eu (TTA)3 Phen (acceptor) by La (TTA)3 Phen (donor). LB films studied here are:(1) [0. 5% Eu (TTA)3 Phen + 99. 5% La (TTA)3 Phen]: A...The Langmuir-Blodgett (LB) technique was used for studying enhanced lumines-cence of Eu (TTA)3 Phen (acceptor) by La (TTA)3 Phen (donor). LB films studied here are:(1) [0. 5% Eu (TTA)3 Phen + 99. 5% La (TTA)3 Phen]: AA = 1: 1; (2) [0. 5%Eu(TTA)3 Phen+99. 5%AA]: AA= 1: 1; (3) La(TTA)3 Phen: AA= 1: 1. These filmscould form stable monolayers at air/water surface. The fluorescence intensity of LB 1 was 65times stronger than that of LB2. This signifies that the luminescence intensity ofEu(TTA)3 Phen could be enhanced by La (TTA)3 Phen clearly. Low angle X-ray diffrac-tog ram of LB1 showed that the film has a period layered structure. To study the intermolec-ular energy transfer, different structures of the multilayer were designed by combining LB2(layer of acceptor) with LB3(layer of donor). The results indicated that the intermolecularenergy transfer occurred in a short-range (<3 nm) and at the position of head-head in Y-typemodel. The influence of the interface on the energy transfer was prominent. The process ofenergy transfer was carried out via the triplet state of TTA.展开更多
To study intermolecular energy transfer of rare earth-β-diketones, monolayers of miXed RE(TTA)3Phen (RE=La, Gd, Tb, or Y) with Eu(TTA)3Phn iu molar ratio of 1:1 and 1:4 were fabricated in this paper. Meanwhile, an ac...To study intermolecular energy transfer of rare earth-β-diketones, monolayers of miXed RE(TTA)3Phen (RE=La, Gd, Tb, or Y) with Eu(TTA)3Phn iu molar ratio of 1:1 and 1:4 were fabricated in this paper. Meanwhile, an active enhanced spherc model was proposed to acquire the efficient radii of energy transfer between the molecules of complexes. The efficient radius for energy transfer from Gd(TTA)3Phen or Tb(TTA)3Phen to Eu(TTA)3Phen is 12A and thosc from La (TTA)3Phen and Y(TTA)3Phen to Eu(TTA)3Phen are 7A and 10A, respectively. The reliabil-ity of the model was proved by comparing the emission intelisities that were calculated by using values of R mentioned above with experimental values. The model proposed is a supplement to Perrins active sphere theory. By this model a triplet-triplct energy trarsfer can be deduced from TTA of RE(TTA)3Phen to that of Eu(TTA)3Phen. The proccss proceeds by an electron exchange mechamism.展开更多
Synthesis of cyclohexyl cinnamate was studied by using PEG 400 and sulphuric acid as catalyst,cinnamic acid and cyclohexanol as raw materials.The effects of catalyst,reactants and reaction time were investigated under...Synthesis of cyclohexyl cinnamate was studied by using PEG 400 and sulphuric acid as catalyst,cinnamic acid and cyclohexanol as raw materials.The effects of catalyst,reactants and reaction time were investigated under optimum conditions,the yield of cyclohexyl cinnamate was over 84.8%.展开更多
光传送网(optical transport network,OTN)技术在电力信息通信传输中的有效应用属于技术突破成果,应围绕技术优势扩大OTN技术应用范围。立足OTN技术应用优势与要求,阐述电网组网、通信检测、通信规划、信息处理等不同电力信息通信传输...光传送网(optical transport network,OTN)技术在电力信息通信传输中的有效应用属于技术突破成果,应围绕技术优势扩大OTN技术应用范围。立足OTN技术应用优势与要求,阐述电网组网、通信检测、通信规划、信息处理等不同电力信息通信传输场景应用路径,总结应用经验,为我国电力信息高效化、规范化传输提供技术支撑。展开更多
文摘The Langmuir-Blodgett (LB) technique was used for studying enhanced lumines-cence of Eu (TTA)3 Phen (acceptor) by La (TTA)3 Phen (donor). LB films studied here are:(1) [0. 5% Eu (TTA)3 Phen + 99. 5% La (TTA)3 Phen]: AA = 1: 1; (2) [0. 5%Eu(TTA)3 Phen+99. 5%AA]: AA= 1: 1; (3) La(TTA)3 Phen: AA= 1: 1. These filmscould form stable monolayers at air/water surface. The fluorescence intensity of LB 1 was 65times stronger than that of LB2. This signifies that the luminescence intensity ofEu(TTA)3 Phen could be enhanced by La (TTA)3 Phen clearly. Low angle X-ray diffrac-tog ram of LB1 showed that the film has a period layered structure. To study the intermolec-ular energy transfer, different structures of the multilayer were designed by combining LB2(layer of acceptor) with LB3(layer of donor). The results indicated that the intermolecularenergy transfer occurred in a short-range (<3 nm) and at the position of head-head in Y-typemodel. The influence of the interface on the energy transfer was prominent. The process ofenergy transfer was carried out via the triplet state of TTA.
文摘To study intermolecular energy transfer of rare earth-β-diketones, monolayers of miXed RE(TTA)3Phen (RE=La, Gd, Tb, or Y) with Eu(TTA)3Phn iu molar ratio of 1:1 and 1:4 were fabricated in this paper. Meanwhile, an active enhanced spherc model was proposed to acquire the efficient radii of energy transfer between the molecules of complexes. The efficient radius for energy transfer from Gd(TTA)3Phen or Tb(TTA)3Phen to Eu(TTA)3Phen is 12A and thosc from La (TTA)3Phen and Y(TTA)3Phen to Eu(TTA)3Phen are 7A and 10A, respectively. The reliabil-ity of the model was proved by comparing the emission intelisities that were calculated by using values of R mentioned above with experimental values. The model proposed is a supplement to Perrins active sphere theory. By this model a triplet-triplct energy trarsfer can be deduced from TTA of RE(TTA)3Phen to that of Eu(TTA)3Phen. The proccss proceeds by an electron exchange mechamism.
文摘Synthesis of cyclohexyl cinnamate was studied by using PEG 400 and sulphuric acid as catalyst,cinnamic acid and cyclohexanol as raw materials.The effects of catalyst,reactants and reaction time were investigated under optimum conditions,the yield of cyclohexyl cinnamate was over 84.8%.
文摘光传送网(optical transport network,OTN)技术在电力信息通信传输中的有效应用属于技术突破成果,应围绕技术优势扩大OTN技术应用范围。立足OTN技术应用优势与要求,阐述电网组网、通信检测、通信规划、信息处理等不同电力信息通信传输场景应用路径,总结应用经验,为我国电力信息高效化、规范化传输提供技术支撑。
