稀土-全反式维甲酸-精氨酸三元配合物的合成、表征及抗肿瘤活性研究

为进一步研究稀土配合物作为药物使用方面的应用,本文报道了4种新型稀土三元固体配合物：REL₂L’Cl·nH₂O（RE：Nd³⁺、Eu³⁺、La³⁺、Sc³⁺;L=全反式维甲酸;L’=L-精氨酸阳离子）的合成和红外光谱、紫外光谱、荧光光谱、元素分析和TG-DTA的测试结果。并利用3-（4,5-二甲基噻唑-2）-2,5-二苯基四氮唑溴盐（MTT）测试方法,初步探讨了配合物对体外培养的人肝癌细胞HepG₂、人肺癌细胞A₅₄₉和人宫颈癌细胞Hela生长的影响。结果表明：4种稀土配合物和稀土硝酸盐、配体全反式维甲酸和L-精氨酸盐酸盐对3种癌细胞株的生长都有一定的抑制作用,但在一定的浓度范围内,三元固体配合物的抑制效果明显优于稀土硝酸盐和2种配体;稀土配合物对3种癌细胞株生长的抑制作用基本上随配合物浓度的增大而增强;在浓度为1mmol·L^-1时,4种配合物对3种肿瘤细胞的抑制率超过60%,ScL₂L’Cl配合物表现出最强的作用,抑制率在80%以上。通过荧光,粘度和紫外光谱方法研究了配合物与药物靶分子DNA的相互作用,结果表明配合物与DNA以嵌入的方式相互作用,推测配合物抗肿瘤活性的起效与这种嵌入DNA双螺旋结构的作用方式有关。本文的研究工作为设计合成高效低毒的稀土抗肿瘤药物提供了一定的思路和实验依据。     

稀土-全反式维甲酸-缬氨酸三元配合物的合成、表征及抗肿瘤活性检测

在无水乙醇介质中,合成了4种新型稀土三元固体配合物。 通过红外光谱、紫外光谱、元素分析和TG-DTA等技术手段测试,确定了配合物的化学组成为:REL₂L'·nH₂O (RE:Nd³⁺,Eu³⁺,La³⁺,Sc³⁺;L=全反式维甲酸;L'=L-缬氨酸)。 利用MTT测试法,检测了配合物对体外培养的人肝癌细胞HepG2、人肺癌细胞A549和人宫颈癌细胞Hela生长的影响。 结果表明,4种稀土配合物与稀土硝酸盐、配体全反式维甲酸和L-缬氨酸对3种癌细胞株的生长均有一定的抑制作用,但在一定的浓度范围内,三元固体配合物的抑制效果明显优于稀土硝酸盐和2种配体;稀土配合物对3种癌细胞株生长的抑制作用基本上随浓度的升高而增强,存在一定的时间依赖性和浓度依赖性。 为了进一步阐明抗肿瘤作用的原因,利用光谱方法和黏度法的手段,对配合物与DNA之间的相互作用方式做了考察,推测配合物抗肿瘤活性的起效与这种嵌入DNA双螺旋结构的作用方式有关。     

单功能铂配合物的合成表征、DNA结合和抗肿瘤活性

本文合成了三种铂(Ⅱ)配合物PtLCl(HL1=2-(3′,5′-二甲基-吡唑-1′-基)-N-(2″-吡啶甲基)乙基胺;HL2=2-(3′,5′-二甲基-吡唑-1′-基)-N-(2″-吡啶乙基)乙基胺;HL3=2-(3′,5′-二甲基-吡唑-1′-基)-N-(喹啉-8″-基)乙基胺,通过元素分析和质谱进行结构表征。利用荧光和圆二色光谱研究了3种配合物与小牛胸腺DNA的相互作用,结果发现配体结构对配合物与DNA的作用方式及强度产生极大影响。PtL3Cl具有较大的共轭平面而易以嵌入模式与DNA结合,而PtL1Cl和PtL2Cl的空间位阻较小,易与DNA以共价模式结合。通过质谱跟踪发现,配合物PtL1Cl和PtL2Cl均能与5′-鸟苷酸(5′-GMP)发生共价结合,但是没有发现PtL3Cl与5′-GMP的加合物。3种配合物对人宫颈癌细胞的体外毒活性数据表明：PtL3Cl的细胞毒活性最强。     

4-(2-羟基-3-氯)苯基-2,2':6',2"-三联吡啶Cu(Ⅱ)配合物的合成、结构表征及抗肿瘤活性

以4-(2-羟基-3-氯)苯基-2,2′∶6′,2″-三联吡啶(HL)为配体,合成了一种新的铜(Ⅱ)配合物[Cu2(μ-L-κO,O)2Cl2](1),并通过红外光谱、电喷雾质谱、元素分析及单晶X射线衍射分析等方法对配合物1进行结构表征。配合物1为双核结构,中心铜(Ⅱ)离子为五配位扭曲四方锥几何构型,每个铜离子与1个Cl-以及来自配体(L-)的2个N原子和2个羟基O原子配位,2个铜(Ⅱ)离子通过羟基的桥联形成双核结构。MTT实验结果表明:配合物1对所选5种癌细胞株表现出不同的抑制活性,尤其是对MGC80-3细胞的抑制作用最明显,抑制率高达(84.30±1.28)%,其IC50值为(3.36±0.43)μmol·L-1。流式细胞术分析结果显示:配合物1能诱导MGC80-3细胞凋亡。在配合物1浓度为4.5μmol·L-1时,MGC80-3的凋亡百分数为41.4%。此外,配合物1将MGC80-3细胞阻滞于G1期,从而抑制肿瘤细胞的生长。     

稀土-姜黄素-吡啶/2,2-联吡啶/1,10-菲啰啉配合物的抗肿瘤活性研究

为系统研究平面芳香结构的共轭体系配体的加入对稀土-姜黄素配合物抑制肿瘤作用的影响,合成了四种稀土元素(RE=Eu,La,Ce,Nd)与姜黄素(L)、吡啶(L’)、2,2-联吡啶(L″)、1,10-菲啰啉(L)的配合物。二元配合物的化学组成为:REL3·2H2O;三元配合物的化学组成分别为:REL3L2’,REL3L″及REL3L。并利用3-(4,5-二甲基噻唑-2)-2,5-二苯基四氮唑溴盐(MTT)比色法,系统研究了稀土离子(III)、姜黄素、稀土-姜黄素二元配合物及稀土与姜黄素的吡啶、2,2-联吡啶、1,10-菲啰啉三元配合物对人肝癌细胞HepG2的抑制作用。体外抗肿瘤活性结果表明:稀土离子、配体姜黄素、稀土三元、二元配合物对癌细胞生长都表现出一定的抑制作用,多个配合物对肿瘤HepG2有明显的抑制作用,部分配合物显示了较强的抗癌活性。REL3L配合物的抑制作用在相同测试条件下常常强于其他配合物;Nd的三种三元配合物的抑制作用在其他三种稀土元素同类配合物中始终最强,说明Nd元素的此类配合物是有潜在实用价值的抗肿瘤药物;在测试的浓度范围内常出现REL3L2’配合物的抑制作用强于REL3L″配合物、REL3·2H2O强于某些三元配合物的现象。为初步探究配合物抗肿瘤作用的原因,用荧光法研究了Nd的三元配合物与DNA的作用,结果表明NdL3L″及NdL3L对DNA分子存在嵌插作用,NdL3L2’无嵌插作用。     

稀土(La,Ce,Er,Nd)-L-精氨酸-邻菲啰啉三元配合物的合成及其电化学性质

以L-精氨酸、1,10-邻菲啰啉为配体,在乙醇-水介质中经60℃水浴加热合成了4种稀土三元配合物。配合物分别用络合滴定、摩尔电导、元素分析、紫外光谱、红外光谱、热重-差热分析等表征,推测出配合物化学组成为:[RE(L-Arg)3Phen]Cl3·n H2O。通过循环伏安法测定了配合物在玻碳工作电极上的电化学行为,在设定电位范围-0.30~-0.80 V(vs.SCE),经HAc-Na Ac缓冲溶液(p H约为6),测试配合物及其稀土盐,均表现出电化学活性,且配合物电化学中心是RE3+,电化学行为是准可逆的,配合物的还原峰电流与扫描速度及浓度呈现递增关系。     

N,N′,N″-三(2-羟基-1-萘酚醛)胺稀土配合物的合成及其荧光性能的初探

预先制备了N,N′,N″-三(2-羟基-1-萘酚醛)胺作为配体(L),然后向含配体L的乙醇-二氯甲烷溶液中加入含稀土硝酸盐晶体RE(NO3)3.6 H2O(RE=La3+,Sm3+,Y3+,Tb3+,Ce3+,Eu3+)的乙醇溶液,合成稀土配合物。利用核磁共振法、元素分析法、摩尔电导法、红外光谱法及差热-热重法对稀土配合物的结构进行表征。结果表明:稀土配合物的结构为RE(NO3)3.L.4 H2O。采用荧光技术对稀土配合物的性能进行了研究,结果表明:在pH值约为7的介质中,以二甲亚砜(DMSO)为溶剂,稀土配合物浓度为1.0×10-4mol.L-1时,铽(Ⅲ)配合物有较强的特征荧光发射,铕(Ⅲ)配合物只表现了微弱的特征荧光发射,其他稀土配合物没有特征荧光发射。     

稀土-姜黄素-菲啰啉配合物荧光和抑菌活性研究

合成了稀土与姜黄素和1,10-菲啰啉的稀土三元配合物和稀土与姜黄素的稀土二元配合物, 通过元素分析、摩尔电导、热重-差热分析、 IR 、 UV-Vis 和1H NMR方法, 确定配合物的化学组成分别为: REL3L′及REL3 · 2H2O (RE=Sm, Eu, Dy, L=姜黄素, L′=1,10-菲啰啉). 同时研究了配合物在室温下的荧光性质, 结果显示稀土三元、 二元配合物都表现出配体(L)的特征发射且发射强度大于配体(L), 三元配合物的荧光强于二元配合物. 抗菌活性试验结果表明, 稀土三元、 二元配合物对枯草杆菌和大肠杆菌都表现出很好的抑制作用, 而且稀土三元配合物REL3L′对所选菌种的抑菌性明显强于稀土二元配合物REL3 · 2H2O和配体姜黄素.     

联吡啶衍生物芳基钌配合物的合成及其与DNA、蛋白质相互作用

以2种配体4,4′-dimethyl-2,2′-bipyridine(L1)和4′-methyl-(2,2′-bipyridine)-4-carbaldehyde oxime(L2),分别与芳基钌二聚体[RuCl_2(η~6-p-cymene)]2合成了2种新型单核配合物[Ru(η~6-p-cymene)(L1)Cl]Cl(1)和[Ru(η6-p-cymene)(L2)Cl]Cl(2)。应用元素分析、ESI-MS和~1H NMR对配合物的组成和结构进行表征,通过紫外光谱法和荧光光谱法研究了配合物的水解及其与CT-DNA和血清蛋白的结合性质,并且进行了细胞毒性研究。结果表明,在水溶液中配合物1比2在动力学上更稳定(k:0.383 h~(-1)(1)、1.458 h~(-1)(2));配合物均通过嵌入作用与双链DNA结合,但2有较强的结合能力(Kb:7.8×10~3L·mol~(-1)(1)、1.86×10~4L·mol~(-1)(2))。配合物均能与蛋白质发生相互作用,引起蛋白静态猝灭,但1作用较强(KA:1.04×10~5L·mol~(-1)(1)、8.62×10~4L·mol~(-1)(2))。配合物与蛋白的较强结合能力,可能是其细胞毒性不高的原因。     

3,5-二苄氧基苯甲酰水杨醛腙的合成及其与稀土硝酸盐配位性能的研究

合成了配体3,5-二苄氧基苯甲酰水杨醛腙(HL)及其与稀土硝酸盐的五种配合物. 通过元素分析、红外光谱、紫外光谱、摩尔电导等测试手段确定配合物组成为[Ln2(L)3(NO3)2](NO3) (Ln = Sm3+, Eu3+, Gd3+, Tb3+, Dy3+), 并对其进行了表征.     

基于多羧酸烟酸配体的镝、钬、铒和铥配合物的合成及荧光、磁学性质的表征

以5-(4-羧基苯氧基)烟酸配体(H₂cpna)和稀土金属离子Dy³⁺、Ho³⁺、Er³⁺和Tm³⁺为原料,采用水热法合成了4种稀土金属配合物[M(Hcpna)(cpna)(H₂O)₃]_n,其中M=Dy(1)、Ho (2)、Er (3)、Tm (4)。单晶X射线衍射分析表明配合物1、2、3和4为同构配合物,均为一维链状结构。通过红外、元素分析以及粉末X射线衍射对所得配合物进行了表征,同时对配合物的荧光和磁学性质开展了研究。荧光测试结果表明,配合物1～4的荧光强度均低于配体H2cpna的荧光强度。在2～300 K温度范围内1 kOe直流电场下测试了配合物1～4的磁性,结果表明配合物1、2、3和4的χ_mT值分别为14.04、14.15、11.08和6.83 cm³·mol^-1·K,与文献理论值相符合。     

Design,synthesis and in vitro cytotoxicity of novel dinuclear platinum(II) complexes with a tetradentate carrier ligand

Four novel dinuclear platinum complexes with a tetradentate ligand, (1R,1′R,2R,2′R)‐N¹,N^1′‐(1,2‐phenylenebis(methylene))dicyclohexane‐1,2‐diamine, as the carrier group, have been designed, synthesized and characterized, and their in vitro cytotoxicity against HepG‐2, A549, HCT‐116 and MCF‐7 cell lines evaluated using MTT assay. Results indicate that the targeted dinuclear platinum complexes H1 , H2 , H3 , H4 exhibit significant growth inhibitory properties against HepG‐2, A549 and HCT‐116 cell lines, but none of them show activity against MCF‐7 cell line. Compound H4 shows better antitumor activity than carboplatin against HepG‐2, A549 and HCT‐116 cell lines. Copyright © 2015 John Wiley & Sons, Ltd.     

SYNTHESIS,PROPERTIES AND BIOLOGICAL ACTIVITY OF RARE EARTH COMPLEXES OF 5-FLUOROURACIL-1-PROPIONIC ACID

Abstract

Seven new solid complexes of 5-fluorouracil-1-propionic acid with rare earth metals have been synthesized. Elemental analyses, molar conductance, TG-DTA, IR, UV-Vis, fluorescence, XPS and ¹H NMR spectra have been used to characterize these complexes. The general formula of the complexes is RE(FPA)₃. nH₂O where RE = Y(III), La(III), Pr(III), Sm(III), Eu(III), Dy(III), Er(III); n=3 or 5. Prooxidative and antitumor activity of these complexes was tested. The results showed that these complexes augment free radical generation; especially the Pr³+ complex which obviously increased the O₂ ^? and OH^? radicals. It was also found that La³+ and Y³+ complexes possess antitumor effects on human colon bladder HCT-B and human leukemia HL-60 cells in vitro.     

Synthesis,characterization, spectroscopy and thermal analysis of rare earth picrate complexes with <Emphasis Type="Italic">L</Emphasis>-lysine

Summary Rare earth picrate (RE) complexes with L-lysine (Lys) were synthesized and characterized. Elemental analysis (CHN), EDTA titrations and thermogravimetry data suggest a general formula RE(pic)₃·2Lys·2H₂O, where RE=La-Lu (without Pm) and Y, pic=picrate). IR spectra suggest that Lys is coordinated to the central ion through the nitrogen of the α-amino group. Parameters obtained from the absorption spectrum of the Nd compound indicated that the metal-ligand bonds are essentially electrostatic. Emission spectrum and biexponential behavior of the luminescence decay of the Eu compound suggest the existence of polymeric species. Thermogravimetric/derivative thermogravimetric (TG/DTG) and differential scanning calorimetry (DSC) curves of all complexes are very similar, with five events. The final products are the corresponding rare earth oxides and their X-ray diffraction patterns are identical to the calcinated oxides.</o:p>     

Synthesis,characterization, spectroscopy and thermal analysis of rare earth picrate complexes with <Emphasis Type="Italic">L</Emphasis>-leucine

Rare earth picrate complexes with L-leucine (Leu) were synthesized and characterized. Elemental analysis (CHN), EDTA titrations and thermogravimetric data suggest a general formula RE(pic)₃2Leu⋅5H₂O (RE=La–Lu, Y and pic=picrate). IR spectra indicate the presence of water and suggest that L-leucine is coordinated to the central ion through the nitrogen of the aminogroup. The absorption spectrum of the solid Nd compound indicates that the metal-ligand bonds show a weak covalent character. Emission spectra and biexponential behavior of the luminescence decay of the Eu compound suggest the existence of polymeric species. Thermal analysis results indicate that all the compounds present a similar behavior, with five major thermal decomposition steps. The final products are rare earth oxides. A slow heating rate is necessary to observe all decomposition steps.     

Speciation of the Vanadium (III) Complexes with 6-Methylpicolinic Acid,Salicylic Acid and Phthalic Acid

The complex species formed in aqueous solutions (25 °C, I=3.0 mol⋅dm⁻³ KCl ionic medium) between the V(III) cation and the ligands 6-methylpicolinic acid (MePic, HL), salicylic acid (H₂Sal, H₂L) and phthalic acid (H₂Phtha, H₂L) have been studied by potentiometric and spectrophotometric measurements. Application of the least-squares computer program LETAGROP to the experimental emf(H) data, taking into account the hydrolytic species and hydrolysis constants of V(III), indicates that under the employed experimental conditions the complexes [VL]²⁺, [V(OH)L]⁺, [V(OH)₂L], [V(OH)₃L]⁻, [VL₂]⁺, [VL₃] and [V₂OL₄] form in the vanadium(III)–MePic system. Were observed the complexes [VL]⁺, [VL₂]⁻, [V(OH)L₂]²⁻ and [VL₃]³⁻ in the vanadium(III)–H₂Sal system, and the species [VHL]²⁺, [VL]⁺, [V(OH)L], [VHL₂], [VL₂]⁻, [V(OH)L₂]²⁻, [V(OH)₂L₂]³⁻ and [VL₃]³⁻ in the vanadium(III)–H₂Phtha system. The stability constants of these complexes were determined by potentiometric measurements, and spectrophotometric measurements were made in order to perform a qualitative characterization of the complexes formed in aqueous solution.     

Novel antitumor dinuclear platinum (II) complexes with a new chiral tetradentate ligand as the carrier group

Seven dinuclear platinum(II) complexes with a novel chiral tetradentate ligand, (1R,1′R,2R,2′R)‐N¹,N^1′‐(1,4‐phenylenebis(methylene))dicyclohexane‐1,2‐diamine, were designed, synthesized and spectrally characterized. All the complexes were evaluated for their in vitro cytotoxicity against human HepG‐2, A549, HCT‐116 and MCF‐7 cancer cell lines. The results indicated that all compounds showed positive biological activity against HepG‐2, A549 and HCT‐116 cancer cell lines. In particular, compounds D7 and D2 showed better activity than carboplatin against HepG‐2 and A549 and compound D7 also showed an activity close to that of oxaliplatin. Copyright © 2015 John Wiley & Sons, Ltd.     

2-羰基-3-苯基丙酸芳甲酰腙二(2,4-二氯苄基)锡配合物的合成、晶体结构及生物活性

二(2,4-二氯苄基)二氯化锡分别与2-羰基-3-苯基丙酸苯甲酰腙及2-羰基-3-苯基丙酸水杨酰腙反应,合成了2个取代苄基锡配合物(C1、C2),通过元素分析、IR、1H NMR、13C NMR、119Sn NMR、X射线单晶衍射以及热重分析等表征了配合物结构。测试了配合物对癌细胞Hela、MCF7、Hep G2、Colo205、NCI-H460以及正常人体胚肾细胞HEK293、正常人体肝细胞HL7702的体外抑制活性;在Tris-HCl缓冲溶液中,以EB做为荧光探针,用荧光光谱法初步研究了配合物与小牛胸腺DNA的相互作用。结果表明:配合物C1、C2对5种癌细胞都有明显的抑制作用,配合物C2对HEK293、HL7702的细胞毒性远小于C1;配合物C1与小牛胸腺DNA作用是插入结合与静电结合共同作用所致,配合物C2与小牛胸腺DNA作用是插入结合作用所致。     

Stereochemistry and solid-state circular dichroism spectroscopy of eight-coordinate chiral lanthanide complexes

Eight-coordinate chiral lanthanide complexes [Eu(dbm)₃L ^RR ] (1), [Eu(dbm)₃L ^SS ] (2) and [Tb(dbm)₃L ^RR ] (3) (L ^RR /L ^SS = (-)-/(+)-4,5-pineno-2,2′-bipyridine, Hdbm = dibenzoylmethane) were synthesized stereoselectively, which were characterized by UV-vis, CD spectra and X-ray single-crystal diffraction. The mirror-image structure features of complexes 1 and 2 were obtained by combination of the solid-state CD spectra and the crystal structure analysis. After further comparison with the solid-state CD spectra of six-coordinate and seven-coordinate metal complexes containing β-diketone ligands, the CD spectra-absolute configuration correlation rule for the eight-coordinate β-diketonate lanthanide complexes was proposed through the exciton chirality method for the first time. The Δ or Λ absolute configurations of complexes 1–3 with the distorted square antiprism geometry were confirmed by the X-ray single-crystal analysis.