On the Question of Site-Selective Ligand Exchange in Carboxylate-Substituted Metal Oxo Clusters

摘要

Reaction of [Ti4Zr4O6(OBu)(4)(OMc)(16)] (OMc = methacrylate) with acetylacetone (acacH) resulted in dissection of the cluster and formation of [Ti(OBu)(2)(acac)(2)] and the smaller cluster [Ti2Zr4O4(OMc)(16)]. In contrast, the same reaction with [Zr6O4(OH)(4)(OOCR)(12)](2)6RCOOH (R = Et, CH2CH=CH2) led to site-selective substitution of two carboxylate ligands and formation of isostructural [Zr6O4(OH)(4)(OOCR)(12-x)(acac)(x)](2)6RCOOH (x <= 1).