Molybdenum complexes with a μ-O{MoO₂}₂ core: their synthesis, crystal structure and application as catalysts for the oxidation of bicyclic alcohols using N-based additives

Abstract

Binuclear molybdenum(vi) complexes with a μ-O{MoO2}2 core as catalysts for the oxidation of bicyclic alcohols (fenchyl alcohol and isoborneol), using 30% H2O2 as the oxidant in the presence of NEt3 as the additive, are reported.

RHODAMINE B PHOTODEGRADATION OVER Ag3 PO4 /SBA-15 UNDER VISIBLE RADIATION BASED ON WLEDS LIGHT

“…Os complexos que teriam maior estabilidade quanto a formação de anéis com o metal central (no caso de todos os complexos propostos formaram anéis de 6 membros) foram propostos; analisou-se o número de oxidação do metal central do complexo com base no precursor (V 5+ , Nb 5+ , Mo 6+ ); e, ainda, verifi cou-se a quantidade de átomos ligados ao metal central além do grupo coordenante. Considerou-se complexos análogos aos que foram relatados na literatuta para ligantes bidentados (MAURYA et al, 2017;QUINTAL et al, 2002;QUINTAL et al,2001). Assim, foi possível concluir que as prováveis estruturas dos complexos são as apresentadas na Figura 1.…”

Trinuclear dioxidomolybdenum(vi) complexes derived from benzene-1,3,5-tricarbohydrazide and study of the catalytic activity

“…1(a)- (c)] have been reported with hydrazone based dibasic tridentate ligands. 16,20,21 One more category that is closer to type (c) of Fig. 1 may also be considered, wherein an additional coordinating group like pyridine that is present within the ligand interacts with the Mo centre of the dioxidomolybdenum(VI) complex and facilitates an oligomeric structure.…”

Ligand coordination sphere effect of Schiff base cis‐dioxomolybdenum(VI) complexes in selective catalytic oxidation of alcohols

“…Recently, several Schiff base molybdenum(VI) complexes have been developed and used as catalysts for various oxygen atom transfer reactions, such as olefins epoxidation, 29–31 sulfides oxidation, 32 and alcohols oxidation 33 . Regarding alcohol oxidations, various Schiff base molybdenum complexes, such as magnetic complex, 34 Mo−V bimetallic complex, 35 and μ ‐O{MoO 2 } 2 core complex, 36 have been evaluated in alcohol oxidation with TBHP or H 2 O 2 as oxidants yielding the corresponding aldehydes or ketones. Nevertheless, dioxomolybdenum(VI) complexes 37,38 and peroxo‐molybdenum(VI) complexes 39,40 have been used for olefin epoxidation but not been fully exploited as catalysts in alcohols oxidation.…”