[The study of interactions of [CpFe(Co)2]2 with surface of alumina and Titania supports by Fourier transform diffuse reflection and photoacoustic infrared spectroscopy].
The diffuse reflection and photoacoustic infrared spectra of the species derived from dicarbonyl (eta5-cyclopentadienyl)iron (0) {[CpFe(CO)2]2 (Cp = eta5-C5H5)} which are supported on the surfaces of acidic,neutral and basic alumina (Al2O3) and Titania (TiO2) have been measured. The structures, stabilities and concentrations of these supported organometallic species depend markedly on the acid-base properties of the alumina surfaces. There is mainly species of [CpFe(CO)2Fe-H-Fe(CO)2Cp]+ on the surface of [CpFe (CO)2]2/Al2O3 (acidic) (A). The species of CpFe(CO)2(-O-) and [CpFe(CO)]4 are observed on the surface of [CpFe(CO)2]2/Al2O3(neutral)(B). On the suface of [CpFe(CO)2]2/Al2O3 (basic) (C), the mainly species is [CpFe(CO)2]4 with a few CpFe(CO)2(-O-) species. The concentration of species is highest on the surface of A and lowest on the, surface of C. The diffuse reflection and photoacoustic (middle and near )infrared spectra of [CpFe(CO)2]2/TiO2(T) show that the [CpFe(CO)2]2 absorbed on the surface of TiO2 is stable in the air at the room temperature. There is no a species derived from [CpFe(CO)2]2 to be observed. The diffuse reflection near infrared spectra of [CpFe(CO)2]2(D) and [CpFe(CO)2]2/TiO2 (T) are measured. Most of them are assigned to overtone and combination of carbonyl vibrations and several peaks are assigned to triple overtone and triple combination. The diffuse reflection infrared spectroscopy is the good method to study the interaction of organometallic compounds with metal oxide powder.
Wang
J
J
State Key Laboratory of Rare Earth Material Chemistry and Applications, Peking University, 100871 Beijing.
Zhao
X
X
Xu
Z
Z