| 查看: 1372 | 回复: 13 | |||
| 当前主题已经存档。 | |||
| 当前只显示满足指定条件的回帖，点击这里查看本话题的所有回帖 | |||
[交流]
【求助】求翻译 已有3人参与
|
|||
|
高手帮忙了，要能通顺。谢谢 Fluorescencepropertiesof 2 and 4 The ligand-assisted photoluminescence properties of the lanthanide compounds 2 and 4 were examined at room temperature.When excited at 335 nm, 2 emits red light, while 4 shows green light emission upon excitation at 334 nm.The photoluminescence spectra are shown in Fig.4.The characteristic emission bands of 2 at 584, 598, 622,and 693 nm are assigned to 5D0 → 7FJ (J =0,1,2, and 4) transitions,while the emission peaks of 4 at 495, 548, 590,and 625 nm can be attributed to 5D4→7FJ (J =6,5,4,and3) transitions,respectively.However,these characteristic emission bands indicate that the ligand-to-metal energy transfer is moderately efficient under the experimental conditions[43].It is noted that the forbidden transition 5D0 → 7F0 was also observed in the europium compound 2.Moreover,the preferred transition,5D0→7F2 for europium-containing luminescent materials,is much more intense than the 5D0→7F1 transition in 2.It is well-known that the 5D0→7F2 transition induced by the electric dipole moment is hypersensitive to the environment of the Euion,while the 5D0→7F1 transition is a magnetic dipole transition which is fairly insensitive to the coordination environment of the Euion.The intensity ratio I(5D0→7F2)/I(5D0→7F1) is equal to 3.57,which indicates that Eu3+ ions are not at an inversion center [12a].This is in agreement with the result of the single crystal X-ray diffraction. |
回复此楼» 猜你喜欢
师弟论文见刊大半年才想起来申请专利，还能抢救一下吗？
已经有5人回复
-
某top大学教授说“能够在市场中兑现的能力才是真能力”无比同意！
已经有3人回复
-
上海工程技术大学 激光智能制造课题组 2027级博士研究生招生
已经有7人回复
-
售SCI文章，我:8O.5.5.1O.54,科目全,可十急
已经有3人回复
-
售SCI一区T0P文章，我:8O.55.1.O.54,科目全,可伽急
已经有3人回复
-
售SCI一区T0P文章，我:8O.55.1.O.5.4,科目齐全,可+急
已经有3人回复
-
售SCI一区T0P文章，我:8.O.55.1.O54,科目全,可伽急
已经有3人回复
-
售SCI文章，我:8O5.5.1.O.54,科目齐全,可+急
已经有3人回复
-
售SCI一区T0P文章，我:8.O.55.1.O.54,科目齐全,可+急
已经有3人回复
-
售SCI文章，我:8O5.5.1.O.54,科目齐全,可+急
已经有4人回复
|
l楼上的，你好强啊，咋做到的？在帮帮我 4.Conclusion The first examples of lanthanide coordination polymers with bpdc and phen were self-assembled by hydrothermal method.The bpdc ligands in these polymers adopt tetrad- entate coordination modes in two bridging bidentate car- boxylate groups.Coordination polymers 1–4 are isostructural,and 1-D zigzag chains are composed of Ln2(bpdc)3(phen)2(H2O)2 building blocks.The bond lengths of Ln–O,Ln–N and Ln Ln separations show a lanthanide contraction over the series.The thermal stabil- ity of the frameworks can be attributed to the high coordi- nation number of lanthanide ions,the strong metal– carboxylate bonds and p–p interactions.Photolumines- cence properties indicate that compound 2 and compound 4 emit characteristic fluorescence,respectively. |
11楼2010-04-13 13:06:20
resonant
木虫 (正式写手)
独自为政
- 应助: 0 (幼儿园)
- 贵宾: 0.063
- 金币: 3859.3
- 帖子: 594
- 在线: 44.5小时
- 虫号: 113887
- 注册: 2005-11-23
- 专业: 光学
2楼2010-04-13 12:31:15
3楼2010-04-13 12:35:22
resonant
木虫 (正式写手)
独自为政
- 应助: 0 (幼儿园)
- 贵宾: 0.063
- 金币: 3859.3
- 帖子: 594
- 在线: 44.5小时
- 虫号: 113887
- 注册: 2005-11-23
- 专业: 光学
4楼2010-04-13 12:36:42
