四种D-氨基葡萄糖甘氨酸混配金属配合物与DNA作用的SERS光谱研究

研究了四种Ｄ－氨基葡萄糖甘氨酸混配金属配合物的表面增强喇曼光谱（ＳＥＲＳ），发现它们在银胶上的吸附方式基本相同，因而ＳＥＲＳ光谱也基本相似，并用ＳＥＲＳ光谱研究了它们与ＤＮＡ的相互作用，发现这四种化合物与ＤＮＡ的作用能力有很大不同，Ｃｏ（Ⅲ）ＧｌｕＧ是值得进一步研究的可能抗癌药物。     

D-氨基葡萄糖金属配合物对DNA作用的谱学研究

合成了d－氨基葡萄糖金属配合物Cu(Ⅱ）,Zn（Ⅱ）Ni（Ⅱ）,Fe（Ⅲ）,Co（Ⅲ）金属配合物,并用电子吸收光谱,荧光光谱、表面增强拉曼光谱（SERS）研究了它们与DNA的相互作用。探讨了它们与DNA的作用方式,发现它们在银胶上的吸附方式基本相同,因而有相似的SERS,其中CuGlu,Co（Ⅲ）Glu作为抗癌药物有进一步研究的价值。     

含硫氨基葡萄糖金属配合物的合成及与DNA和蛋白作用研究

合成了四种含硫氨基葡萄糖金属配合物(M-GLUS,M=Co, Cu, Ni和Zn),利用元素分析,摩尔电导,核磁共振氢谱进行了结构表征。结果表明含硫配体与这四种二价金属离子均形成了2∶1型非电解质配合物。在pH 7.08 Tris缓冲液中,采用紫外吸收光谱和荧光光谱研究了金属配合物与小牛胸腺DNA的作用机制,发现随着金属配合物量的逐渐增加,DNA电子吸收光谱的最大吸收峰呈增色效应,对配合物DNA-EB体系也能产生荧光猝灭作用,说明四种金属配合物均可与DNA发生相互作用,结合方式为部分插入;在近似生理酸度条件下,利用荧光光谱对金属配合物与HSA/BSA的结合特性进行了初步分析,发现配合物均能猝灭HSA/BSA的荧光强度,利用Scatchard方程计算了四种金属配合物与HSA/BSA的结合常数和结合位点数,表明金属配合物与血清白蛋白有较强的结合且只有1类键合位,其中Co-GLUS与蛋白的结合力最强。     

水杨醛甘氨酸席夫碱-含氮杂环稀土配合物的合成及其与DNA作用的光谱研究

合成了以水杨醛甘氨酸席夫碱（Sal-GlyK）、邻菲罗啉（Phen）和2,2’-联吡啶（Bipy）为配体、Eu³⁺、La³⁺为中心的配合物。对其进行了元素分析和摩尔电导、红外光谱及紫外吸收光谱测定,推测配合物的组成分别为RE（Sal-Gly）（NO₃）·2H₂O和RE（Sal-Gly）（Phen）（NO₃）·H₂O、RE（Sal-Gly）（Bipy）（NO₃）·H₂O（RE³⁺=Eu³⁺,La³⁺）。通过紫外吸收光谱及荧光光谱研究了稀土配合物与小牛胸腺DNA的作用方式及其结合常数。结果表明,本文合成的配合物与DNA的结合能力的顺序为RE（Sal-Gly）（Phen）（NO₃）·H₂O>RE（Sal-Gly）（Bipy）（NO₃）·H₂O >RE（Sal-Gly）（NO₃）·2H₂O,表明配合物是以插入方式与DNA结合,含有良好平面性和较大表面积配体的配合物可以更好地插入到DNA的碱基对中。     

水杨醛甘氨酸席夫碱-含氮杂环稀土配合物的合成及其与DNA作用的光谱研究

合成了以水杨醛甘氨酸席夫碱(Sal-GlyK)、邻菲罗啉(Phen)和2,2'-联吡啶(Bipy)为配体、Eu3+、La3+为中心的配合物。对其进行了元素分析和摩尔电导、红外光谱及紫外吸收光谱测定,推测配合物的组成分别为RE(Sal-Gly)(NO3)·2H2O和RE(Sal-Gly)(Phen)(NO3)·H2O、RE(Sal-Gly)(Bipy)(NO3)·H2O(RE3+=Eu3+,La3+)。通过紫外吸收光谱及荧光光谱研究了稀土配合物与小牛胸腺DNA的作用方式及其结合常数。结果表明,本文合成的配合物与DNA的结合能力的顺序为RE(Sal-Gly)(Phen)(NO3)·H2ORE(Sal-Gly)(Bipy)(NO3)·H2ORE(Sal-Gly)(NO3)·2H2O,表明配合物是以插入方式与DNA结合,含有良好平面性和较大表面积配体的配合物可以更好地插入到DNA的碱基对中。     

过渡金属-甘氨酸配合物的IR光谱

本文合成了甘氨酸络铜（Ⅱ）、甘氨酸络锌（Ⅱ）和甘氨酸络锰（Ⅱ）3种氨基酸配合物，测定了各配合物的红外光谱，并对它们的谱带进行了详细的归属。     

用SERS研究一种新的钌(Ⅱ)联吡啶配合物及其与DNA的作用机理

着重讨论了用ＳＥＲＳ研究Ｒｕ（ｂｐｙ）２ｄｐｐｚ配合物及其与ＤＮＡ作用的机理。当这种钌配合物与ＤＮＡ发生作用时,只是它的ｄｐｐｚ配体插入了ＤＮＡ双链的碱基对中,与碱基对形成了共轭体系,影响了Ｒｕ配合物的ＭＬＣＴ跃迁,产生了荧光,同时也在拉曼谱图和电子吸收谱图上有所表现。     

鬼臼酰肼镍(Ⅱ)金属配合物与DNA的相互作用

利用吸收光谱、荧光光谱、DNA热变性研究了鬼臼酰肼金属配合物与小牛胸腺DNA之间的相互作用。在金属配合物的存在下,DNA的紫外吸收光谱产生了明显的减色效应。实验结果表明,鬼臼酰肼金属配合物与DNA之间主要以嵌入方式相结合。     

8-氮杂腺嘌呤及其金属配合物与DNA的作用机理

8-氮杂腺嘌呤是抗代谢类药物,临床上广泛用于治疗增殖很快的肿瘤。文章以溴化乙啶为探针,通过紫外光谱,荧光光谱,研究了8-氮杂腺嘌呤及其与Co2+和Cu2+ 离子形成的配合物同DNA的作用。结果发现：在pH 9.86时,8-氮杂腺嘌呤可与Co2+形成稳定配合物,此配合物与DNA之间静电作用较强、嵌插作用较弱;在pH 7.4时,8-氮杂腺嘌呤可与Cu2+形成稳定配合物, 其与DNA之间主要以嵌插作用为主、静电作用为辅;在pH 2.85时,8-氮杂腺嘌呤-Cu2+配合物与DNA之间嵌插作用较强、静电作用较弱;在pH 7.4时,8-氮杂腺嘌呤几乎不影响EB和DNA之间的嵌入结合方式, 它与DNA为静电方式结合。这些结果,可为合理改善药效,降低抗癌药物毒性和设计新药提供理论依据。     

氨基葡萄糖及羧甲基氨基葡萄糖与铁(Ⅱ)、锌(Ⅱ)、钴(Ⅱ)、铜(Ⅱ)配合物的光谱特征

本文研究了氨基葡萄糖及羧甲基氨基葡萄糖分别与铁（Ⅱ）、锌（Ⅱ）、钴（Ⅱ）、铜（Ⅱ）形成配合物的UV，IR和^1H-NMR光谱特征。配合物紫外的λmax发生了明显紫移；在IR谱中，配合物的面外振动峰655cm^-1较未配位的氨基葡萄糖中的面外振动峰670cm^-1低，且在990cm^-1附近出现新的吸收峰；在^1H-NMR谱中，配合物C3上羟基中的质子化学位移较未配位的均移向高场，氨基上质子的化学位移较未配位的也移向高场，其他碳上羟基中的质子化学位移值不变，从而初步证实了配合物中的氨－金属（N－M）键的形成。本文还研究了羧甲基氨基葡萄糖及其与铁（Ⅱ）、钴（Ⅱ）、铜（Ⅱ）配合物的合成。其配合物的IR谱线较未配位的IR谱线并没增多，指出这种反常现象是糖环的刚性所致。它们的IR和UV光谱均证实了分子中不存在游离的羰基峰，并证实了它们分子中内盐的存在，配合物的IR谱中出现新的一组吸收峰：433.1和408.9cm^-1(O-Fe)，507．1和495．0cm^-1（O－Co),403.1和389.0cm^-1(O-Cu)，证实了配合物中的氧－金属键（O－M）的形成。     

Surface-enhanced Raman spectra of a complex of antimony with phenylfluorone and their interpretation

We present the resonance Raman scattering and surface enhanced Raman scattering (SERS) spectra of a complex of antimony with phenylfluorone (Sb-PF). Using the quantum-mechanical density functional method, we have calculated the geometric structure and frequencies of vibrations of the Sb-PF molecule and proposed for the first time an interpretation of its Raman spectra. Based on analysis of spectral changes that occur upon formation of a complex of phenylfluorone with Sb, we have found lines—markers—that can be used for detection and quantitative determination of the content of antimony by the SERS spectroscopy method.     

Surface-enhanced Raman scattering spectroscopy of topotecan-DNA complexes: Binding to DNA induces topotecan dimerization

The interaction of topotecan (TPT), antitumor inhibitor of human DNA topoisomerase I, with calf thymus DNA was studied by surface-enhanced Raman scattering (SERS) spectroscopy. The SERS spectra of TPT are found to depend on its concentration in solution, which is associated with the dimerization of TPT. The spectral signatures of dimerization are identified. It is shown that binding to DNA induces the formation of TPT dimers. The formation of DNA-TPT-TPT-DNA complexes is considered as one of the possible mechanisms of human DNA topoisomerase I inhibition.     

Ru(bpy)2dppx2+与核酸作用的光谱研究

合成７,８－二甲基二联吡啶并（３,２,ａ：２’,３’,ｃ）吩嗪,简称ｄｐｐｘ,并合成了Ｒｒ（ｂｐｙ）２ｄｐｐｘ＾２＋混配物,研究了混配物与ＤＮＡ作用的紫外－可见光谱与荧光光谱。在ｐＨ９．５时ＤＮＡ能使混配物的紫外可见光谱发生明显的减色效应,荧光光谱在５９９ｎｍ处（λｅｘ＝４７１ｎｍ）产生新的荧光峰,探讨了反应的机理。     

罗丹明6G在银纳米线阵列上的SERS光谱研究

制备出有序、均匀的活性衬底一直足表面增强拉曼散射(SERS)研究中的关键.阳极氧化法制备的多孔氧化铝膜的结构有序、均匀,为纳米金属SERS基底的制备提供了模板.以沉积了银的多孔氧化铝组装体为衬底,研究了罗丹明6G(Rh6G)分子的表面增强拉曼散射光谱.结果表明,沉积了银的多孔氧化铝模板是很好的SERS衬底,Rh6G分子在此衬底上的SERS谱强度与银纳米线在表面的显露高度有关,而其拉曼频移未受表面状态的影响,而PO43-离子的存在使SERS强度得到很大提高.     

Polarisation studies on the Raman spectra of cubic crystals

Polarisation characters of the Raman lines of calcium fluoride (fluorspar) and potassium aluminium sulphate (alum) were investigated under the following conditions. Unpolarised light was incident normally on a face of the crystal making an angle 22.5° with a cubic face and the light scattered transversely along a cubic axis was analysed by a double image prism kept with its principal axes inclined at 45° to the vertical. Under these conditions the depolarisation factors of the Raman lines belonging to the totally symmetric (A), the doubly degenerate (E) and the triply degenerate (F) modes should be respectively =1, >1 and <1. The characteristic Raman line of CaF₂ at 322 cm^?1 exhibited a depolarisation value less than 1, showing thereby that the corresponding mode is a triply degenerate one (F). The Raman lines observed in the spectrum of K-alum were also classified and the results were compared with those given by previous investigators using standard crystal orientations.     

非水乙腈体系中CO在铂电极表面吸附的SERS研究

在非水乙腈体系中，借助LabRam Ⅰ型共焦显微拉曼系统，尝试用表面增强拉曼光谱（SERS）对作为燃料电池中毒化中间体的CO在过渡金属铂电极表面的催化氧化进行了研究，并考察了在电极电位的变化过程中CO的催化氧化与周围环境分子的相互作用。不仅观察到CO在铂金属表面的吸附和氧化，还得到溶剂乙腈分子发生解离的表面增强拉曼光谱，并对CO和CH3CN分子在铂电极上的竞争吸附进行了分析。     

Surface-enhanced Raman scattering and DFT theoretical studies on the adsorption behavior of plumbagin on silver nanoparticles

The comparative study of normal Raman spectrum with the SERS along with the DFT calculations predicts the adsorption geometry of plumbagin on silver surface. The surface geometry of plumbagin molecule was studied by analysis of the SERS spectra adsorbed on silver colloid surfaces. The large enhancement of inplane ring stretching and C-H in-plane bending modes in the surface-enhanced Raman scattering spectrum indicates that the molecule is adsorbed on the silver surface in a stand-on orientation of PLBN on a silver surface.     

Polarisation studies on the Raman spectra of cubic crystals

General expressions have been derived for the intensities of the three classes of Raman lines namely totally symmetricA, doubly degenerateE and triply degenerateF, in the case of cubic crystals under the following conditions. The direction of the incident beam which is polarised with its electric vector inclined at an angleα to the normal to the scattering plane makes an angleΘ with one of the cubic axes of the crystal. The transversely scattered light is analysed by a double image prism with its principal axes inclined at angleβ to the normal to the scattering plane, which is horizontal. For incident unpolarised light and Θ=22 1/2°, and the scattered light being analysed by a double image prism rotated through 45° from the position when its principal axes are vertical and horizontal? forA lines is equal to one, forE lines >1 and forF lines <1. This gives a method of classifying the Raman lines of a cubic crystal in a single setting. The results have been experimentally verified in sodium chlorate.     

Surface-enhanced Raman scattering studies on bombesin, its selected fragments and related peptides adsorbed at the silver colloidal surface

SERS studies presented in this work on BN^8-14, [d-Phe⁶,β-Ala¹¹,Phe¹³,Nle¹⁴]BN^6-14, [d-Tyr⁶,β-Ala¹¹,Phe¹³,Nle¹⁴]BN^6-14, BN and its modified analogues, as well as NMB, NMC, and PG-L show that these molecules at pH 8.3 bind to a colloidal silver surface mainly through Trp⁸ and Met¹⁴ residues. Trp⁸ adsorbs at the surface almost perpendicularly. Met¹⁴ appears on the surface mainly as a P_C-G conformer. His¹², as is evident from the spectra, practically does not take part in the adsorption process. Substitution of l-leucine at the 13 position of amino acid sequence with l-phenylalanine does not change substantially the pattern of the adsorption mechanism; however, substitution of phenylalanine at the 12 position (instead of l-histidine) causes changes in the SERS spectra that show that Phe¹² takes parallel orientation to the surface upon adsorption of [d-Phe¹²]BN, while in the case of [Tyr⁴,d-Phe¹²]BN this residue is perpendicular to the surface and influences the orientation of the bound Trp⁸. On the other hand, substitution of Asn with Tyr in the 6 position in nonapeptide fragment causes changes in the adsorption mechanism. In this case, the discussed fragment binds to the silver colloidal surface by Tyr⁶, Trp⁸, and Met¹⁴. The SERS spectrum of NMC is very similar to that of BN; although it differs by the binding orientation of the amide bond towards the surface. Appearance of Phe¹³ in NMB and PG-L causes that this residue competes successfully with Trp⁸ forcing it to take tilted orientation. As seen from the enhancement of the characteristic Phe vibrations this moiety in NMB and PG-L adsorbs on the silver surface in a tilted fashion. This arrangements cause that the 8-14 peptide chain in all these studied compounds takes almost a parallel orientation to the surface while the 1-5 fragment of the peptide chain is removed from the silver surface vicinity.