节点文献
牛磺酸席夫碱配合物的合成、表征及生物活性研究
Studies on the Synthesis, Characterization and Bioactivities of the Taurine Schiff Base Complexes
【作者】 杨立荣;
【作者基本信息】 中国海洋大学 , 海洋化学, 2006, 博士
【摘要】 席夫碱配合物在生物、催化、材料等领域具有广泛的应用,成为当前配位化学研究热点之一。合成新的席夫碱配体及配合物,研究其性质及应用,对配位化学的发展有重要意义。牛磺酸是一种含有磺酸基(-SO3-)的β-氨基酸,较之以α-氨基酸,具有独特的结构特征和生物活性,因此,开辟这一领域的研究很有意义。国内外对牛磺酸及其席夫碱金属配合物的研究很少,尤其是与稀土元素配合物的研究尚未见报道,可能是因为-SO3-较弱的亲和力而难以形成稳定配合物的原因。本文选择结构各异的羰基化合物与牛磺酸缩合成席夫碱,改变了-SO3-电子云密度布居和空间效应,使得牛磺酸席夫碱的配位环境得以优化,其配位能力得到增强,足以与溶剂分子竞争参与配位,本文合成了过渡及稀土金属离子的若干配合物;采用元素分析、光谱分析、X-ray晶体衍射、X-ray粉末衍射、摩尔电导、热分析等方法对其结构进行了表征,推断出配合物可能的结构,并对部分配合物的抑菌、抑制超氧阴离子自由基活性以及对DNA的插入作用进行了研究。本文合成了6个系列69种新配合物。这些配合物是以稀土元素Ln(III)、过渡金属(II)为中心离子,以邻香草醛缩牛磺酸盐(HTOvK)、水杨醛缩牛磺酸盐(HTSalK)、5-氯-2-羟基-3-甲基苯甲醛缩牛磺酸盐(HTCHK)、2,3,4-三羟基苯甲醛缩牛磺酸盐(HTTHK)、2-噻吩甲醛缩牛磺酸盐(HT2THK)、2-羟基-1-萘醛缩牛磺酸盐(HTNAK)为配体合成的,为了得到三元配合物,合成中引入了具有平面共轭构型、含有杂原子的第二配体(如:1,10-菲咯啉(L1)、2-氨基吡啶(L2)、2,2,-联吡啶(L3)、8-羟基喹啉(L4)等),从而提高配合物与受体活性位点在空间效应、电子效应方面的匹配度,以期目标合成并筛选具有生物活性的配合物。配体及配合物的合成是在非水体系中以及较温和的条件下进行的。配合物的组成如下。邻香草醛缩牛磺酸盐席夫碱(HTOvK)配合物组成分别为:[TOvL1M]·3H2O(M= Cu(II)、Zn(II) , n=3 ; M= Ni(II)、Mn(II) , n=4 ; M= Co(II) , n=2) ; [LnTOvL1 (NO3)]·2H2O(Ln=La,Eu,Tb,Dy,Ho,Er,Tm,Yb)。水杨醛缩牛磺酸盐席夫碱(HTSalK)配合物组成分别为:[MTSalL2]·nH2O(M=
【Abstract】 Schiff base and its complexes are widely used in the fields of biology, catalysis and material etc. Thus, studies on the synthesis of novel Schiff base complexes and their properties and application are significant to the development of coordination chemistry.Six novel Schiff base ligands which are derived from taurine- o-vanillin(HTOvK), taurine-salicylaldehyde (HTSalK), taurine-5-chloro-2-hydroxy-3- methylformaldehyde (HTCHK),taurine-2,3,4-tri-hydroxybenzoicformaldehyde(HTTHK), taurine-thiophene- 2- formaldehyde (HT2THK), taurine-2-hydroxy- 1-naphthaldehyde (HTNAK) have been prepared, and sixty-nine coordination compounds of lanthanide nitrates or transition metal with these ligands have been synthesized. Some hetero atom-containing ligands such as 2,2 , -dipyridyl, 1,10-phenanthroline, 8-hydroxyquinoline, 2-Aminopyridine are also involved due to their planar conjugation configuration, which may improve the matching performance of the complexes with the active sites on acceptor at the aspects of steric and electronic effects. Complexes modified by these ligands may be beneficial to their bioactivities. All these complexes are first reported. These ligands and complexes were characterized by elemental analysis, IR spectroscopy, UV spectroscopy, TG-DTG analysis, X-ray powder diffraction , X-ray crystal diffraction and molar conductance analysis, and the suggested structures of the complexes were concluded. Bioactivities of the novel complexes including antibacterial activity, the scavenging activity to O2-·and intercalation action with DNA have been studied.The compositions of the metal complexes with Schiff base ligands from taurine-o-vanillin (HTOvK) are confirmed to be [MTSalL2]·nH2O (M= Mn, Ni, Co, n=2; M=Cu, n=3);[Ln( HTSal)L2 (NO3 ) 2 ]·2H2O( L n = La , Eu , Pr, N d, Tb) ; [Ln(TSal)L1 (NO3)]·2H2O(Ln=Eu, Gd, Tb, Dy, Ho, Er, Yb); [Ln(HTSal)2](NO3)·2H2O (Ln=La,Pr,Nd); [Ln(HTSal)L3(NO+3)](NO+3)·2H2O (Ln =La, Eu, Pr), respectively.The compositions of the metal complexes with Schiff base ligands from
【Key words】 taurine; Schiff base; synthesis; characterization; bioactivities;