O box 1948 dhahran 31261 saudi arabia e mail

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Unformatted text preview: a later stage, undergoing a more rapid VII reaction with the Re (O)(S) intermediate. That step, studied by competition methods, is characterized by a Hammett reaction constant of = 3.0. Although no thermodynamic selectivity for arsine attack at O or S of the intermediate was found, computational results show a large kinetic selectivity in favor of ‡ -1 Ar3AsS formation; the values of H for attack at Re=O vs. Re=S are 17.8 and 1.1 kcal mol . Triarylphosphines are much less effective catalysts because they convert the dimer catalyst to [MeReO(edt)(PAr3], which reacts sluggishly. INO-O11 THE IMPORTANCE OF TRIBOCHEMICAL REACTIONS IN COMPLEX SYNTHESIS AND ITS DANGEROUS IN IR SPECTRA 1 M. M. Mostafa and S.M. Al-Ashqar 2 2 Chemistry Department, Faculty of Science, Mansoura University, Mansoura, EGYPT Chemistry department, Faculty of Science, Umm Al -Qura University, Makkah, Saudi Arabia E-mail: amohsenmostafa@yahoo.com + 2+ 2+ 2+ 3+ 2+ 3+ 1 Novel metal complexes derived from Cu , Cu , Pd , Pt , Ru , Co and Co ions have been synthesized using tribochemical reactions. The isolated solid complexes have been characteri zed using conventional 1 chemical and spectral techniques (UV, IR, H-NMR, mass). The geometries of the isolated solid complexes are determined using spectral and magnetic studies. The aim of this work is to develop new techniques for synthesis of metal complexes using a cheap method and to avoid pollution. Also, one of our goals is to synthesize new metal complexes which cannot be prepared by the conventional chemical methods. Moreover, this type of synthesis is considered as a type of green chemistry. Finally, the importance of this type of reaction is to avoid the solid interactions between the chemical co mpounds with KBr during the measurements of IR spectra. Recently, we published several papers concerning the synthesis of metal complexes by tribochemistry involving Cu(I), Cu(II), Co(II), Co(III), Pd(II), Pt(II), Pt(IV) and Ru(III) ions. We used alkali halides (KBr and KI) for the synthesis of novel metal complexes. On usi...
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This note was uploaded on 02/17/2011 for the course CHEMISTRY 101 taught by Professor Csr during the Spring '11 term at University of Louisville.

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