Synthesis, Characterization and Fluorescence Studies on Complexes of Terbium with Phenylglyoxylic Acid, 2,2-Dipyridine, 1,10-Phenanthroline, Triphenyl Phosphine Oxide

Three new complexes TbL3dipy （H2O）2, TbL3phen （ H2O ）2 and TbL2 （ TPPO ）2NO3 have been synthesized （L = phenylglyoxylate ion, dipy = 2, 2- dipyfidine, phen = 1,10-phenanthroline, TPPO = Triphenyl phosphine oxide ）. Elemental analysis, conductivity, IR spectra and ^1HNMR spectra studies were performed on them. IR spectra indicate that carboxylate ions in the phenylglyoxylate are coordinated to Tb （Ⅲ） ions as unidentate ligands. In ^1HNMR, the signals of hydrogens in phenylglyoxylate shift upfield. The excitation and emission spectra of the three comolexes were recorded at room temoerature, the excitation spectra show that the optimum excitation wavelengths are 361.0, 359.0 and 367.0 nm, respectively. Four emission bands due to ^5D4-^7Fj （j = 6, 5, 4, 3 ） transitions were observed for TbLadipy （ H2O ）2 （489.0, 545. 0, 584.0,620.0 nm） and TbL3phen （H2O）2 （490. , 544.0, 583.0, 620.0 nm）. And under the same conditions, only one emission band due to ^5Da-^7F5 transition was observed for TbL2 （TPPO）ENO3. The emission intensity of TbLadipy （H2O）2 is the strongest among the three complexes.

多源数据下地铁站域TOD效能评估——以武汉地铁2号线为例

对大型城市而言,以TOD(transit-oriented-development)模式为导向进行城市建设对缓解交通拥堵、节约土地资源具有重要的现实意义。为有效评价TOD模式的实施效能,首先以轨道交通和城市用地的协调程度为切入点,基于经典的“节点-场所”模型(node-place model),结合城市路网、人口、建筑等多源数据,对地铁站点区域内TOD模式导向下的建设效能进行评估并对站点进行分类。随后根据交通与发展政策研究所(institute for transportation and development policy,ITDP)的评价标准对各类别的典型站点进行了调研和分析。以武汉市地铁2号线为例,研究结果表明,站域土地利用和交通功能的协同发展更符合TOD模式导向下的建设要求。武汉市应当对不同类型的站点采取针对性措施,以提高其TOD建设效能。