Metal iyonları varlığında ve yokluğunda rubeanik asitin voltametrik davranışlarının incelenmesi
The investigation of voltammetric behaviour of rubeanic acid in the presence and absence of metal ions
Yazar: OSMAN OKTAY
Danışman: YRD. DOÇ. DR. EMİNE COŞKUN
Ondokuz Mayıs Üniversitesi / Fen Bilimleri Enstitüsü / Kimya Ana Bilim Dalı
Derece: Yüksek Lisans, 2006
Konu: Kimya = Chemistry

Özet:
iiiÖZET0(7$/Ã¸<21/$5,9$5/,ö,1'$9(<2./8ö81'$58%($1Ã¸.$6Ã¸7Ã¸192/7$0(75Ã¸.'$95$1,Ã¹/$5,1,1Ã¸1&(/(10(6Ã¸.DSDOÃ IRUPÂOÂ 1+2CSCSNH2 olan rubeanik asit (R.A.) önemli derecede biyolojikaktiIOLÃ·H sahip bir molekül ROGXÃ·XQGDQ LOJL oHNLFL ELU ELOHÃºLNWLU $\UÃFD NLP\DQÃQ ED]ÃGDOODUÃQGDPHWDOD\ÃUDFÃRODUDNGDNXOODQÃOÃU0HYFXW oDOÃÃºPDODUGD UXEHDQLN DVLWLQ HOHNWURNLP\DVDO GDYUDQÃÃºÃS+(2-12DUDOÃÃ·ÃQGDBritton-5RELQVRQ WDPSRQXQGD .DUH 'DOJD 6:9 YH '|QÂÃºÂPOÂ (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 NDUÃºÃOÃN JHOLUNHQLNLQFL YH ÂoÂQFÂ SLNOHULQ WHUVLQPH] HOHNWURW UHDNVL\RQODUÃQdan kaynakODQPDNWDGÃU pHGHÃ·HUOHUL ile SLN SRWDQVL\HOL YH SLN DNÃPÃ GHÃ·HUOHUL GHÃ·LÃºPLÃºWLU S+ GHÃ·HUL GHQ Â¶\Hartarken rubeanik DVLWLQ SLN SRWDQVL\HOOHUL GRÃ·UXVDO RODUDN QHJDWLI GHÃ·HUOHUH ND\PÃÃºWÃUpH'yD NDUÃºÃ oL]LOHQ Ep JUDILÃ·LQGH S+ (2-12) DUDOÃÃ·ÃQGD ELULQFL ve ikinci indirgenmeSLNOHUL LoLQ LNL GRÃ·UX HOGH HGLOGL (OHNWURW UHDNVL\RQODUÃQÃQ ++ L\RQX LoHUGLÃ·LGÂÃºÂQÂOPHNWHGLUÃ¸ONSLNLQWHUVLQLUOLÃ·LS+=7'de oldukça iyi iken aUWDQS+GHÃ·HUOHUL ile birlikte 2,06 ileDUDOÃÃ·ÃQGD GHÃ·LÃºHQ .Q GHÃ·HUOHUL KHVDSODQGÃ A\UÃFD, rubeanik asitin tiyol ÃºHNOLQLnHg(II) ile elektrot yüzeyinde olXÃºWXUGXÃ·X civa tuzunun indirgenmesine ait ROGXÃ·XGÂÃºÂQÂOdü. 'LÃ·HU SLNOHUL tiyol JUXSODUÃQÃQ LQGLUJHQPHVLndenise moleküldekikaynaklanabilir.%XQGDQ EDÃºND, rubeanik asitin &G,, =Q,, YH &R,, L\RQODUÃ LOH HWNLOHÃºLPLincelendi. Rubeanik asit ile Cd(II) vH =Q,, L\RQODUÃQÃQ HWNLOHÃºLPL sonucundakomplekslere ait olan pikler gözlenirken Co(II) ve rubeanik DVLW YDUOÃÃ·ÃQGD ise katalitikKLGURMHQGDOJDVÃJ|UÂOGÂ

Abstract:
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.