铅(II)-氨基多羧酸配合物的合成与结构研究  

Investigation on the Syntheses and Structures of Pb^(2+) Complexes with EDTA and EDTA Derivative Ligands

作　　者：王君[1] 刘振荣[1] 张向东[1] 贾卫国[1] 范大民[1] 

机构地区：[1]辽宁大学化学系,沈阳110036

出　　处：《Chinese Journal of Structural Chemistry》2003年第4期454-458,共5页结构化学（英文）

摘　　要：合成了铅(II)与乙二胺四乙酸(EDTA),N-羟乙基乙二胺三乙酸(HEDTA)和 (乙酸-N-羟乙基酯)乙二胺三乙酸(AHEDTA, A = 乙酸-N-羟乙基酯)的配合物,C10H20K2N2O12Pb (K2[Pb(EDTA)]4H2O), C10H22K2N2O11Pb (K2[Pb(HEDTA)]4H2O)和C12H23KN2O11Pb (K[Pb- (AHEDTA)]3H2O), 并测定了K2[Pb(EDTA)]4H2O晶体结构和分子结构。具体测定结果如下:单斜晶系,C2/c空间群,a = 24.59(2),b = 11.79(1),c = 14.08(2) 牛琤 = 108.15(2),V = 3876.0(7)) 3,Z = 8,Mr = 654.65,Dc = 2.213 g/cm3,m = 9.196 mm-1和F(000) = 2480。最终偏差因子分别为R = 0.0458,wR = 0.0640 (对3372 (I > 2.0s(I))可观测衍射点)。在K2[Pb(EDTA)]4H2O中,配合物离子[Pb(EDTA)]2-具有六配位的非标准三棱柱体结构,EDTA作为六齿配体提供4个O原子和2个N原子与中心金属离子Pb2+形成配键。The K-2[Pb(EDTA)].4H(2)O, K-2[Pb(HEDTA)].4H(2)O and K[Pb(AHEDTA)].3H(2)O complexes were synthesized and the molecular and crystal structures of K-2[Pb(EDTA)].4H(2)O have been determined by single-crystal X-ray structure analysis with the following data: monoclinic system, space group C2/c, a=24.59(2), b=11.79(1), c=14.08(2) Angstrom, beta=108.15(2)degrees, V=3876.0(7) Angstrom(3), Z=8, M-r=654.65, D-c=2.213 g/cm(3), mu=9.196 mm(-1) and F(000)=2480. The final R and wR are 0.0458 and 0.0640, respectively for 3372 observed reflections (I>2.0sigma(I)). In the K-2[Pb(EDTA)].4H(2)O complex, the anion [Pb(EDTA)](2-) has a six-coordinated structure with distorted trigonal prism. The EDTA acts as a hexadentate ligand with four 0 and two N atoms and coordinates to the central metal Pb2+ ion. In addition, close distance between the Pb2+ and K+ ions was also found.

关 键 词：铅(Ⅱ)-氨基多羧酸配合物 合成 分子结构 Pb(Ⅱ) 乙二胺四乙酸衍生物 解毒剂 

分 类 号：O641.4[理学—物理化学]