Raman spectroscopic studies on surface coordination mechanism of benzotriazole and triphenylphosphine with metals |
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| Institution: | 1. Department of Chemistry, Inorganic Chemistry, University of Basel, Spitalstrasse 51, CH-4056 Basel, Switzerland;2. Screening Laboratory of Biological Activity Tests and Collection of Biological Material, Faculty of Pharmacy, Wroclaw Medical University, Borowska 211A, PL-50 556 Wroclaw, Poland;3. Physiotherapy Department, Public Higher Medical Professional School in Opole, 68 Katowicka Street, PL-45 060 Opole, Poland;1. CEA, DEN, DEC, SA3C, LARC, F-13108 Saint-Paul-lez-Durance, France;2. CEA, DEN, DEC, SA3C, LEMCI, F-13108 Saint-Paul-lez-Durance, France;3. Aix-Marseille University, CNRS, IRD, CEREGE UM34, F-13545 Aix-en-Provence, France;1. Institute of Chemical Technology Prague, Department of Metals and Corrosion Engineering, Technická 5, 166 28 Prague 6, Czech Republic;2. Institute of Plasma Physics AS CR, v.v.i., Za Slovankou 1782/3, 182 00 Prague 8, Czech Republic;1. West Pomeranian University of Technology, Szczecin, Faculty of Chemical Technology and Engineering, Department of Inorganic and Analytical Chemistry, Al. Piastów 42, 71-065 Szczecin, Poland;2. University of Silesia, Institute of Physics, ul. Uniwersytecka 4, 40-007 Katowice, Poland |
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| Abstract: | The complexes of benzotriazole (BTAH) with Ag, Cu, Fe, Zn and Ni were prepared respectively in the non-aqueous solution by the direct electrochemical synthesis and characterized by microanalysis and normal Raman spectroscopy. The influence of the neutral ligand of triphenylphosphine (pph3) on the coordination process was deduced by the normal Raman spectroscopy and electrochemistry. The metals were classified into two categories. For the first type, such as Cu and Ag, CuBTA and AgBTA were obtained in the solution without pph3. The introduction of pph3 led to its participation in the coordination processes of BTAH with Cu or Ag and appeared in the final complex. Fe, Zn and Ni belonged to the second type, there was no influence on the coordination of BTAH with Zn, Ni and Fe, i.e., the final complexes were Fe(BTA)2, Zn(BTA)2 and Ni(BTA)2, respectively, in the solution with/without pph3. The electrochemical results revealed that the BTAH can inhibit the corrosion of all the above metals, and the introduction of pph3 resulted in the decrease of inhibition efficiency to Cu surface, while no influence was observed on the Ni surface. The different role of pph3 was explained in terms of hard/soft acids and bases rule and coordination mechanism was proposed. |
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