Heterogenization of Co(II)- and Cu(II)-complexes containing a terpyridine-based Schiff base macrocyclic ligand on thiol-functionalized mesostructured silica

Publication date: Available online 14 December 2019Source: Journal of Organometallic ChemistryAuthor(s): Cristnel Solórzano, Franklin J. Méndez, Joaquín L. Brito, Pedro Silva, Juan R. Anacona, Ernesto Bastardo-GonzálezAbstractHexagonal mesoporous MCM-41-type molecular sieve has been functionalized with (3-mercaptopropyl)trimethoxysilane and used to heterogenized two large Co(II)- and Cu(II)-complexes containing a terpyridine-based Schiff base macrocyclic ligand. First, thiol groups were linked to the siliceous surface of the mesoporous host via grafting process. Some samples were characterized by SA-XRD, N2 physisorption, 13C-MAS-NMR, FTIR, XPS and EPR. These set of characterization techniques confirmed a successful functionalization process, and also confirmed that used experimental procedure allowed the heterogenization of Co(II)- and Cu(II)-complexes inside the pores of functionalized host, retaining the mesoporous structure. The homo- and hetero-geneous catalysts were active for cyclopentene oxidation. Co@MCM(F) sample was reported in this article as the best catalyst for catalytic test due to its higher activity and selectivity, as well as its low loss of catalytic activity after reuse.Graphical abstract

Source: Journal of Organometallic Chemistry - December 15, 2019 Category: Chemistry Source Type: research