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4,6-二甲基-2-巯基嘧啶衍生物及其金属配合物的合成、表征和生物活性研究

Studies on Synthesis and Properties of Derivations of 4,6-Dimethyl-pyrimidin-2-thiol and Their Transition Metal Complexes

【作者】 李芬芳

【导师】 金龙飞;

【作者基本信息】 华中师范大学 , 无机化学, 2006, 硕士

【摘要】 本文合成了两种新的巯基嘧啶类配体:4,6-二甲基-2-巯基嘧啶乙酸(L1)和硫代二草酰二-(3,5-二甲基嘧啶)(L2),并且合成了15种过渡金属配合物,其中获得2个单晶,包括单核和双核配合物,并采用红外、紫外、核磁共振谱,元素分析和X-单晶衍射进行了表征,从键长、键角方面分析了配合物的配位情况,同时对它们的生物活性进行了研究。 对配合物Cu2(phen)2(L1)(H2O)(OH)(2ClO4),[Zn(Phen)(L1)Cl]2(3H2O),(其中phen为邻菲咯啉)分别进行了X-射线单晶衍射测定,其结构参数如下: Cu2(phen)2(L1)(H2O)(OH)(2ClO4)是双核配合物,属单斜晶系,空间群:P2(1),晶胞参数a=8.2295(7)(?),b=18.0274(15)(?),c=24.5459(19)(?),β=96.240(2),V=3620.0(5)nm3,Z=4,Dc=1.686 g/cm3,Mr=918.64,F(000)=1864,μ(Mo-Ka)=1.452 mm-1,R1=0.1091,wR2=0.1380。配合物中两个Cu原子配位环境类似,都是与邻菲咯啉上的两个N原子,H2O中氧原子,OH氧原子和4,6-二甲基-2-巯基嘧啶乙酸中的氧原子配位,两个Cu原子以H2O,OH和4,6-二甲基-2-巯基嘧啶乙酸中的氧原子桥连,都呈变形四方锥形。 [Zn(Phen)(L1)Cl]2(3H2O)是单核配合物,属单斜晶系,空间群:Pc,晶胞参数a=15.193(3)(?),b=8.6910(17)(?),c=16.159(3)(?),β=92.79(3),V=2131.1(7)nm3,Z=2,Dc=1.575 g/cm3,Mr=1010.56,F(000)=1036,μ(Mo-Ka)=1.409mm-1,R1=0.0287,wR2=0.0700。配合物中一个Zn原子与邻菲咯啉上的两个N原子,一个Cl原子和4,6-二甲基-2-巯基嘧啶乙酸中的一个氧原子配位,呈三角双锥构型,另外一个Zn原子与邻菲咯啉上的两个N原子,4,6-二甲基-2-巯基嘧啶乙酸中的一个氧原子以及一个Cl原子配位而呈变形四面体构型。 对所合成的配合物进行了生物活性研究,通过紫外、荧光以及凝胶电泳实验研究了目标化合物与DNA的相互作用。结果发现L1与金属形成的配合物与DNA几乎没有作用,但是L1与邻菲咯啉及金属形成的配合物与DNA有很好的作用,通过凝胶电泳实验证实了这些配合物与DNA存在着插入键合作用。L2与金属形成的配合物与DNA只是有静电作用。 对目标化合物进行了荧光活性的测试,结果表明[Zn(L1)(Phen)(Cl)]2(3H2O)的荧光活性比[Cu2(L1)(Phen)2(OH)(H2O)](2ClO4)的荧光活性强。

【Abstract】 In this thesis two new ligands containing 4,6-dimethyl-pyrimidin-2-mercaptoacetic acid(Ll) and bis(2-(4,6-dimethylpyrimidin-2-ylthio))-2-oxalaldehyde(L2) and their fifteen new complexes have been synthesized . Among of them, two crystals containing mononuclear complexes and binuclear complex have been obtained.Elemental analysis, UV-vis, IR, 1HNMR and x-ray single crystal diffraction measurements were used to characterize all the compounds. And the biological activity of all the compounds have been studied.The crystal structures of Cu2(phen2 (L1)(H2O) (OH) (ClO42, [Zn(Phen)(L1)Cl]2(3 H2O) were determined by x-ray diffraction. The crystal datas are as follow:The crystal structure of Cu2(phen2(L1)(H2O)(OH)(ClO42 which is binuclear complex has been determined in the monoclinic group, P2(l), with a = 8.2295(7) A, b = 18.0274(15) A, c = 24.5459(19) A, 6 = 96.240(2)° , V = 3620.0(5) nm3, Z = 4, Dc = 1.686 g/cm3, Mr = 918.64, F(000) = 1864, μ (Mo-Ka) = 1.452 mm-1, R1 = 0.1091, wR2 = 0.1380. The center coppers(Ⅱ) are bonded to two nitrogen atoms coming from phen, two oxygen atom from water and hydroxyl respectively and one oxygen atom of 4,6-dimethyl-pyrimidin-2-mercaptoacetic acid(Ll), and two copper atoms are bridged by two oxygen atoms from water and hydroxyl and two oxygen atoms from bidentate ligand(Ll). The copper atoms form a five-coordinate distorted pyramids.The crystal structure of [Zn(Phen)(L1)Cl]2(3H2O) has been determined in the monoclinic group, Pc, with a = 15.193(3) A , b = 8.6910(17) A , c = 16.159(3) A , 6 = 92.79(3), V = 2131.1(7)nm3, Z = 2, Dc = 1.575 g/cm3, Mr = 1010.56, F(000) = 1036, μ (Mo-Ka) = 1.409mm-1, R1 = 0.0287, wR2 = 0.0700. The complex belong to mononuclear. Every two mononuclear complexes and three solvent water molecule compose a crystal unit. The structure of the two complexes of the unit are not the same. One zinc( II )atom is bonded two nitrogen atoms from phen, one chlorine atom and one oxygen atom from 4,6-dimethyl-pyrimidin-2-mercaptoacetic acid(Ll) which is as monodentate and form four-coordinate distorted tetrahedral. While the other zinc(II) atom is bonded two nitrogen atoms from phen, one chlorine atom and two oxygen atoms from 4,6-dimethyl-pyrimidin-2-mercaptoacetic acid(Ll) which is as bidentate and form five-coordinate distorted trigonal bipyramids.In addition, the interaction of the compounds with calf thymus DNA has been investigated by UV spectra, fluorescent spectra and gel electrophoresis. The experimental results show that the mixture ligand complexes interact with DNA mainlyby intercalative mode. The complexes contained L2 show that the binding mode with DNA is electrostatical binding.The fluorescence activities of the complexes are much more obvious. The complexe [Zn(LlXPhenXa)]2(3H2O) is more obvious than the complex (^(LlXPhen^OH) ( H2O)](2C1O4)

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