全部 标题 作者
关键词 摘要

OALib Journal期刊
ISSN: 2333-9721
费用:99美元

查看量下载量

相关文章

更多...
电化学  2010 

非水体系苯并咪唑及衍生物吸附的电化学表面增强拉曼光谱研究

, PP. 343-349

Keywords: 铜电极,苯并咪唑,非水体系,表面增强拉曼光谱,三苯基膦

Full-Text   Cite this paper   Add to My Lib

Abstract:

应用电化学现场表面增强拉曼光谱(SERS)以及直接电化学合成技术分别研究了非水体系中苯并咪唑及2-巯基苯并咪唑在铜电极表面的吸附行为及其与三苯基膦(pph3)共存的表面过程.在较负电位区间苯并咪唑主要以分子形式吸附在电极表面.在较正电位区间,电极表面生成类高分子(CuBIM)n膜,具有缓蚀作用,对含有pph3的该体系,Cu+首先与pph3配位形成稳定的阳离子,进入溶液之后与BIM配位生成稳定的配合物,导致不能在表面有效地成膜而破坏了苯并咪唑的缓蚀作用.2-巯基苯并咪唑在Cu表面主要通过自组装单层方式在电极表面吸附,且在实验测试的电位区间内,MBI均是以S端与金属表面作用,其吸附取向随电位正移由倾斜逐渐向接近垂直过渡,并在金属表面形成MBI单分子层膜.pph3的加入不影响MBI在Cu电极表面的成膜行为.电化学现场模拟合成及产物结构组成解析为推断表面反应过程提供了直接证据.

References

[1]  Ferreira M G S,Melendres C A(Eds.).In electro-chemical and optical techniques for the study and moni-toring of metallic corrosion[M].The Netherlands:Klu-wer Academic Pubishers,1991.355.
[2]  Bockris J O''M,Hobib M A,Carbajal J L.Adsorption of thiourea on passivated iron[J].J Electrochem Soc,1984,131:3032-3033.
[3]  Thorpe J M,Beddoes R L,Collison D,et al.Surface co-ordination chemistry:corrosion inhibition by tetranuclear cluster formation of iron with salicylaldoxime?[J].An-gew Chem Int Ed,1999,38:1119-1121.
[4]  Yuan Y X,Wei P J,Qin W,et al.Combined studies on the surface coordination chemistry of benzotriazole atthe copper electrode by direct electrochemical synthesis and surface-enhanced Raman spectroscopy[J].Eur J Inorg Chem,2007:4980-4987.
[5]  Musiani M M,Mengoli G,Fleischmann M,et al.An electrochemical and SERS investigation of the influence of Ph on the effectiveness of some corrosion inhibitors of copper[J].J Electroanal Chem,1987,217:187-202.
[6]  Carron K T,Xue G,Lewis M L.A surface enhanced Raman spectroscopy study of the corrosion-inhibiting properties of benzimidazole and benzotriazole on copper[J].Langmuir,1991,7:2-4.
[7]  Yao J L,Ren B,Cao P G,et al.Extending surface Ra-man spectroscopy to transition metals for practical ap-plications IV.A study on corrosion inhibition of benzo-triazole on bare Fe electrodes[J].Electrochim Acta,2003,48:1263-1271.
[8]  Gu R A,Yao J L,Yuan Y X,et al.Time-resolved sur-face-enhanced Raman spectroscopic studies on coad-sorption of derivatives of thiourea with C1O4-at Ag e-lectrodes[J].Acta Chim Sinica,1998,56:692-699.
[9]  Tian Z Q,Ren B,Wu D Y.Surface-enhanced Raman scattering:From noble to transition metals and from rough surfaces to ordered nanostructures[J].J Phys Chem B,2002,106:9463-9483.
[10]  Morsy M A,Al-Khaldi M A,Suwaiyan A.Normal vibra-tional mode analysis and assignment of benzimidazole by ab initio and density functional calculations and po-larized infrared and Raman spectroscopy[J].J Phys Chem A,2002,106:9196-9203.
[11]  Walsh J F,Dhariwal H S,Gutierrez Sosa A,et al.Pro-bing molecular orientation in corrosion inhibition via a NEXAFS study of benzotriazole and related molecules on Cu(100)[J].Surf Sci,1998,415:423-432.
[12]  Wang G,Harrison A,Li X,et al.Study of the adsorp-tion of benzimidazole and2-mercaptobenzothiazole on an iron surface by confocal micro-Raman spectroscopy[J].J Raman Spectrosc,2004,35:1016-1022.
[13]  Xue G,Lu Y.Various adsorption states of2-mercapto-benzimidazole on the surfaces of gold and silver studied by surface enhanced Raman scattering[J].Langmuir,1994,10:967-969.
[14]  Doneux T,Buess-Herman C,Hosseini M G,et al.Ad-sorption of2-mercaptobenzimidazole on a Au(111)e-lectrode[J].Electrochim Acta,2005,50:4275-4282.
[15]  Pearson R G.Hard and soft acids and bases[J].J Am Chem Soc,1963,85:3533-3539.
[16]  Barron P F,Dyason J C,Healy P C,et al.Lewis-baseadducts of Group11metal(I)compounds.Part28.Solid-state phosphorus-31cross-polarization magic-an-gle spinning nuclear magnetic resonance and structuralstudies on the mononuclear3∶1adducts of tripheny-lphosphine with copper(I)halides[J].J Chem Soc,Dalton Trans.1987:1099-1106.

Full-Text

Contact Us

service@oalib.com

QQ:3279437679

WhatsApp +8615387084133