resumo
A Zn complex was stepwise intercalated in a Mg/Al layered double hydroxide material (HT) holding phenylalanine in its interlayer spacing. The material was characterized by powder X-ray diffraction, FTIR and solid state C-13 NMR spectroscopy. By analogy, the [Zn(phe)(H2O)](NO3) complex bearing deprotonated phenylalanine (phe) amino acid as ligand and a labile water molecule, mimicking biological moieties, was also prepared as model and characterized by HR-MS, FTIR and H-1 solution NMR spectroscopy. Both the Zn-containing HT material and model complex were tested in the catalytic epoxidation of cyclooctene, styrene and 1-octene. All tests were carried out with hydrogen peroxide (H2O2) or tert-butylhydroperoxide (TBHP), leading selectively to epoxides in most cases. Both temperature and oxygen source were found to be key factors in controlling epoxide selectivity, especially when using H2O2, where results were outstanding. Furthermore, the reported results show that the catalytic performance of this Zn system is at the same level of similar systems, holding heavier metals and less sustainable, found in the literature, while the Zn-containing HT catalyst had also the advantage of recyclability.
palavras-chave
LAYERED DOUBLE HYDROXIDES; INTERCALATION COMPOUNDS; ACTIVE CATALYSTS; AMINO-ACIDS; COMPLEXES; OXIDATION; IMMOBILIZATION; NANOPARTICLES; HYDROTALCITE; PHENOL
categoria
Chemistry; Materials Science; Mineralogy
autores
Fernandes, CI; Vaz, PD; Nunes, TG; Nunes, CD
nossos autores
Pedro Miguel Duarte Vaz
Colaboradoragradecimentos
The authors would like to acknowledge FCT for financial support (projects UIDB/00100/2020, UIDP/00100/2020, RECI/QEQ-QIN/0189/2012, UID/CTM/50011/2019). CIF (SFRH/BD/81029/2011) thanks FCT for financial support for a PhD grant.