Borvornwattananont, Aticha; Möller, Karin; Bein, Thomas
Organometallic fragments in microporous solids: intrazeolite chemistry of (cyclooctatetraene)iron tricarbonyl.
In: Journal of Physical Chemistry, Vol. 93, No. 10: pp. 4205-4213
The intrazeolite reactivity of (COT)Fe(CO)3 (COT = cyclooctatetraene) [ 11 in faujasites having different levels of Bronsted
acidity was examined with extended X-ray absorption fine structure, vibrational, and temperature programmed desorption/mass
spectrometric techniques. The data show that the precursor complex [l] associates with Na-Y zeolite, resulting in symmetry
changes of the Fe(C0)3 fragment while 1 remains chemically intact. If (COT)Fe(CO)3 is adsorbed into highly acidic H-Y
zeolite at room temperature, bicyclo[5.1 .O]octadienyliron tricarbonyl cation is formed in a clean reaction. This reaction
corresponds to the protonation of 1 with noncoordinating acids in homogeneous solution. At elevated temperatures, the carbonyl
ligands are cleaved off and the remaining organo-iron fragment is anchored to framework oxygens of the large zeolite supercages.