Mustafa Sülü

Acetalization and Transacetalization Reactions Catalyzed by Ruthenium, Rhodium, and Iridium Complexes with {2-{{Bis[3-(trifluoromethyl)phenyl]phosphino}methyl}-2-methylpropane- 1,3-diyl}bis[bis[3-(trifluoromethyl)phenyl]phosphine] (MeC[CH2P(m-CF3C6H4)2]3)

The complexes [RhCl(3−n)(MeCN)n(CF3triphos)](CF3SO3)n (n=1, 2; CF3triphos=MeC[CH2P(m-CF3C6H4)2]3) and [M(MeCN)3 (CF3triphos)](CF3SO3)n (M=Ru, n=2; M=Ir, n=3) are catalyst precursors for some typical acetalization and transacetalization reactions. The activity of these complexes is higher than those of the corresponding species containing the parent ligand MeC[CH2P(C6H5)2]3(Htriphos). Also the complexes [MCl3(tripod)] (tripod=Htriphos and CF3triphos) are active catalysts for the above reactions. The complex [RhCl2(MeCN)(CF3triphos)](CF3SO3) catalyzes the acetalization of benzophenone.

The ruthenium and iridium coordination chemistry of the tripodal ligand CH3C{CH2P(m-CF3C6H4)2}3

Abstract The ruthenium(II) complexes [Ru(CF 3 CO 2 ) 2 (CF 3 triphos)], [Ru 2 (μ-Cl) 3 (CF 3 triphos) 2 ]Cl, [RuH(CH 3 CN) 2 (CF 3 triphos)](CF 3 SO 3 ) and [Ru(CH 3 CN) 3 (CF 3 triphos)](CF 3 SO 3 ) 2 (CF 3 triphos=CH 3 C{CH 2 P( m -CF 3 C 6 H 4 ) 2 } 3 ) were prepared and characterized. The iridium complexes [Ir(COD)(CF 3 triphos)] + , [IrCl(CO)(CF 3 triphos)], [Ir(CO) 2 (CF 3 triphos)] + , [IrCl 3 (CF 3 triphos)] and [IrCl 3− n (MeCN) n (CF 3 triphos)](CF 3 SO 3 ) n ( n =1, 2 and 3) were also prepared and characterized. The coordination chemistries of these two elements with CF 3 triphos and with the unsubstituted ligand CH 3 C{CH 2 P(C 6 H 5 ) 2 } 3 (Htriphos) are compared. It is shown that, relative to Htriphos, CF 3 triphos (a) stabilizes the iridium(I) relative to the iridium(III) oxidation state and (b) its cationic complexes are stronger Lewis acids.

The high possibility of antiferromagnetic exchange interactions in dinuclear Fe(III) dithiocarbamates

In this study, the possible antiferromagnetic interactions in a dinuclear entity have been considered. It has been realized that, if the proposed structure is a real structure, there should be antiferromagnetic interactions between the dinuclear Fe(III) ions. It is also suggested that the predicted theoretical results should be tested with additional experimental measurements

Antioxidant activities of the new tetrasubstituted metal-free, Zn(II) and Co(II) monophthalocyanines

4-[(4′-(Tert-butyl)phenoxy)phenoxy]phthalonitrile 1 has been prepared by the reaction of 4-(4-nitrophenoxy)phthalonitrile with 4-tertiarylbutylphenole. 4-((4′tert-butyl)phenoxy)phenoxy tetrasubstituted metal-free 2, zinc(II) 3 and cobalt(II) 4 phthalocyanines have been prepared by tetramerization of compound 1. The synthesized phthalocyanines showed high solubility in common organic solvents such as CHCl3. All compounds were characterized by elemental analysis and 1H-NMR, 13C-NMR, UV-vis, IR spectra. Aggregation behaviors of these compounds have been investigated in different solvents (CHCl3, THF, DMF and DMSO) and different concentrations in CHCl3. The in vitro antioxidant activities of phthalocyanine compounds 2, 3 and 4 were evaluated in a series of assays involving DPPH radicals, hydroxyl radicals, superoxide radicals, singlet oxygen and hydrogen peroxide. Antioxidant activity of compound 2was found to be higher than that of compounds 3 and 4.

MAGNETOCHEMISTRY OF SOME TRINUCLEAR Co(II) THIOCARBOXYLATES

This study discusses the magnetic behavior of some trinuclear Co(II) thiocarboxylates complexes. From the detailed theoretical investigation, it is suggested that, although the reported magnetic moments seem to be due to the spin and some orbital contributions, there may be some intramolecular ferromagnetic exchange interactions among the paramagnetic centers.