Abstract
The assembly of Ir4(CO)12 from Ir(CO)2(acac) precursors in the supercages of zeolite NaY was investigated by extended X-ray absorption fine structure (EXAFS) and in-situ infrared (IR) spectroscopies. The data show that the conditions of pretreatment of the zeolite significantly affect the formation process of Ir4(CO)12. When the zeolite was initially largely dehydrated, so that the precursor molecules were well dispersed in the zeolite cages, dimeric intermediates in the formation of Ir4(CO)12 (approximated as Ir2(CO)8) were observed by both IR and EXAFS spectroscopies. In contrast, when the zeolite initially contained a substantial amount of water, the resultant Ir4 clusters were formed faster than those in dehydrated zeolite, and evidence of intermediates was not observed. The results show how synthesis in the confined spaces of the zeolite nanoporesin the absence of solventsaffords opportunities to control and elucidate the chemistry, different from that in solution.
Published Version
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