作者:Mansoor Ahmed Qazi、Ümmühan Ocak、Miraç Ocak、Shahabuddin Memon、Imam Bakhsh Solangi
DOI:10.1007/s10895-013-1200-3
日期:2013.5
A readily available chromionophore 5,11,17,23-tetra-tert-butyl-25,27-bis(hydrazidecarbonylmethoxy)-26,28-dihydroxycalix[4]arene (HCC4) was employed as a chromogenic sensing probe selective for Pb(II) and Cr2O7 2− ions among a series of various ions such as Li(I), Na(I), K(I), Rb(I), Ba(II), Sr(II), Al(III), Cd(II), Co(II), Cu(II), Hg(II), Ni(II), Pb(II) and Zn(II) as well as Cr2O7 2−, CH3CO2 −, Br−, Cl−, F−, I−, ClO4 − and NO3 − that have been examined by UV-visible and fluorescence spectroscopic techniques. The HCC4 in DCM-MeCN system forms 2:1 (ligand-metal) complex with Pb(II). It also shows 2:1 stoichiometry with Cr2O7 2−. The complexation phenomenon has been confirmed by FTIR spectroscopy that favors the selective nature of HCC4 with Pb(II) and Cr2O7 2−. Thermal gravimetric analysis (TGA) also supports its utility in drastic conditions.
使用现成的发色团 5,11,17,23-四叔丁基-25,27-双(酰肼羰基甲氧基)-26,28-二羟基杯[4]芳烃 (HCC4) 作为 Pb 选择性显色传感探针( II) 和 Cr2O7 2− 等一系列各种离子中的离子,例如 Li(I)、Na(I)、K(I)、Rb(I)、Ba(II)、Sr(II)、Al(III)、 Cd(II)、Co(II)、Cu(II)、Hg(II)、Ni(II)、Pb(II) 和 Zn(II) 以及 Cr2O7 2−、CH3CO2−、Br−、Cl−、 F−、I−、ClO4− 和 NO3− 已通过紫外-可见光和荧光光谱技术进行检测。 DCM-MeCN 体系中的 HCC4 与 Pb(II) 形成 2:1(配体-金属)络合物。它还显示与 Cr2O7 2− 的化学计量为 2:1。 FTIR 光谱证实了络合现象,这有利于 HCC4 与 Pb(II) 和 Cr2O7 2− 的选择性。热重分析 (TGA) 也支持其在恶劣条件下的实用性。