Metal İyonları Varlığında ve Yokluğunda Rubeanik Asitin Voltametrik Davranışlarının İncelenmesi

Abstract

iiiÖZET0(7$/ø<21/$5,9$5/,ö,1'$9(<2./8ö81'$58%($1ø.$6ø7ø192/7$0(75ø.'$95$1,ù/$5,1,1ø1&(/(10(6ø.DSDOà IRUP O 1+2CSCSNH2 olan rubeanik asit (R.A.) önemli derecede biyolojikaktiIOL÷H sahip bir molekül ROGX÷XQGDQ LOJL oHNLFL ELU ELOHúLNWLU $\Uà FD NLP\DQà Q ED]à GDOODUà QGDPHWDOD\à UDFà RODUDNGDNXOODQà Oà U0HYFXW oDOà úPDODUGD UXEHDQLN DVLWLQ HOHNWURNLP\DVDO GDYUDQà úà S+(2-12DUDOà ÷à QGDBritton-5RELQVRQ WDPSRQXQGD .DUH 'DOJD 6:9 YH '|Q ú PO (CV) Voltametriyöntemleriyle incelendi. Rubeanik asite ait üç indirgenme piki gözlendi (pH =7'de-0,616, -0,787 ve - 9 %LULQFL SLN WHUVLQLU HOHNWURW UHDNVL\RQXQD NDUúà Oà N JHOLUNHQLNLQFL YH  o QF SLNOHULQ WHUVLQPH] HOHNWURW UHDNVL\RQODUà Qdan kaynakODQPDNWDGà U pHGH÷HUOHUL ile SLN SRWDQVL\HOL YH SLN DNà Pà GH÷HUOHUL GH÷LúPLúWLU S+ GH÷HUL GHQ ¶\Hartarken rubeanik DVLWLQ SLN SRWDQVL\HOOHUL GR÷UXVDO RODUDN QHJDWLI GH÷HUOHUH ND\Pà úWà UpH'yD NDUúà oL]LOHQ Ep JUDIL÷LQGH S+ (2-12) DUDOà ÷à QGD ELULQFL ve ikinci indirgenmeSLNOHUL LoLQ LNL GR÷UX HOGH HGLOGL (OHNWURW UHDNVL\RQODUà Qà Q ++ L\RQX LoHUGL÷LG ú Q OPHNWHGLUøONSLNLQWHUVLQLUOL÷LS+=7'de oldukça iyi iken aUWDQS+GH÷HUOHUL ile birlikte 2,06 ileDUDOà ÷à QGD GH÷LúHQ .Q GH÷HUOHUL KHVDSODQGà A\Uà FD, rubeanik asitin tiyol úHNOLQLnHg(II) ile elektrot yüzeyinde olXúWXUGX÷X civa tuzunun indirgenmesine ait ROGX÷XG ú Q Odü. 'L÷HU SLNOHUL tiyol JUXSODUà Qà Q LQGLUJHQPHVLndenise moleküldekikaynaklanabilir.%XQGDQ EDúND, rubeanik asitin &G,, =Q,, YH &R,, L\RQODUà LOH HWNLOHúLPLincelendi. Rubeanik asit ile Cd(II) vH =Q,, L\RQODUà Qà Q HWNLOHúLPL sonucundakomplekslere ait olan pikler gözlenirken Co(II) ve rubeanik DVLW YDUOà ÷à QGD ise katalitikKLGURMHQGDOJDVà J|U OGÂ

ivABSTRACTTHE INVESTIGATION OF VOLTAMMETRIC BEHAVIOUR OF RUBEANICACID IN THE PRESENCE AND ABSENCE OF METAL IONSRubeanic acid (R.A.), having an important biological activity, the molecularformula of which is NH2CSCSNH2, has been an attractive compound. In addition, themolecule is used as a metal reagent at some branches of chemistry.Electrochemical behaviour of rubeanic acid was investigated with the method ofSquare Wave Voltammetry (SWV) and Cyclic Voltammetry (CV) between the pHvalues 2 and 12 using Britton Robinson Buffer. Three reduction peaks (-0.616; -0.787;-1.032 V at pH=7) originating from rubeanic acid were observed. The first peakcorresponds to the reversible electrode reaction and the second and third ones were seenbecause of the irreversible electrode reactions. The peak potential and current valueschanged with the pH values. While the pH values increased from 2 to 12, the peakpotentials of rubeanic acid shifted to linear negative values. The plot of Ep versus pHexhibited two lines corresponding to the first and second reduction peaks in the pHrange (2-12). Electrode reactions include H+ ions.The reversibility of the first peak was extremely good at pH 7. With increasing pHYDOXHVWKHFDOFXODWHG.QYDOXHVFKDQJHGin the interval (2,06-1,31). In addition to this,this peak was ascribed to the reduction of the mercury salt, occuring on the electrodesurface by the thiol form of rubeanic acid with Hg (II). The other peaks were thought tobe coming from the reduction of thione groups at the molecule.Moreover, the interaction of rubeanic acid with Cd(II), Zn(II) and Co(II) ions werestudied. As a result of the interaction of Cd(II) or Zn(II) ions with rubeanic acid, thepeaks which could be attributed to the complexes were observed. On the other hand, inthe presence of Co(II) and rubeanic acid, the catalytic hydrogen wave was alsoobserved.