Journal
CHEMCATCHEM
Volume 13, Issue 13, Pages 3090-3098Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cctc.202100389
Keywords
homogeneous catalysis; epoxidation; N ligands; carboxylate ligands; hydrothermal synthesis; transition metals
Categories
Funding
- National Research Foundation of Ukraine [2020.02/0071]
- project CICECO-Aveiro Institute of Materials [UIDB/50011/2020, UIDP/50011/2020]
- COMPETE 2020 Operational Thematic Program for Competitiveness and Internationalization by national funds through the FCT (Fundacao para a Ciencia e a Tecnologia)/MEC (Ministerio da Educacao e Ciencia) [POCI-01-0145-FEDER030075]
- European Union through the European Regional Development Fund under the Portugal 2020 Partnership Agreement
- national funds (OE), through FCT, I.P. [57/2016, 57/2017]
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In this study, MoO3 coordination hybrids were developed using specific ligands and utilized for liquid phase epoxidation reactions, demonstrating good catalytic activity and separation performance. The complexes synthesized showed promising applications in catalytic processes.
2-(4H-1,2,4-triazol-4-yl)acetic acid (trglyH) and (dl)-4-methyl-2-(4H-1,2,4-triazol-4-yl)pentanoic acid (trleuH) were used as ligands for the development of MoO3 coordination hybrids for catalytic applications. Coordination polymers [Mo2O6(Htrgly)] . H2O (1) and [MoO3(trleuH)] . 0.5H(2)O (2) were prepared and structurally characterized. Compound 1 adopts a structure in which edge-sharing MoO6 octahedra are organized in a ribbon motif via mu(3)-O bridges. The Htrgly ligand exists as a zwitterion: -CO2- links two Mo-VI in a mu(2)-eta(1) : eta(1) mode, while positively charged triazolium is left uncoordinated. In 2, Mo atoms are joined in a chain through mu(2)-O. The more hydrophobic trleuH appears in a nonionized form and its [N-N] sites serve as a clamp for supporting the [-OMo(O)(2)-OMo(O)(2)(tr)(2)](n) sequence. The complexes were explored for liquid phase catalytic epoxidation of cis-cyclooctene, using H2O2 or tert-butylhydroperoxide as oxidants. The hybrids showed good catalytic activity, and 2 behaved as a reaction-induced self-separating catalyst for olefin epoxidation with H2O2, presenting advantages of homogeneous and heterogeneous catalysis.
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