Lanthanum-1,2,3-Triazole-Based 2D Coordination Polymer is an Efficient Catalyst for the Oxidation of Olefins
Yonas Belay1, Alfred Muller1, D Bradley G Williams2
1Department of Chemical Sciences, University of Johannesburg, Auckland Park, P.O. Box 524, Johannesburg 2006, South Africa.
Abstract:
A new two-dimensional (2D) coordination polymer (CP) [La(C18H14N3O6)2(H2O)(OH)] has been prepared from a 1,2,3-triazole linker and lanthanum nitrate hexahydrate in DMF. The La-CP was characterized by single-crystal X-ray crystallography, highlighting the binding motif at La ions and the fact that the material contains channels with entrapped solvent. The CP showed good catalytic activity for the oxidation of a wide variety of olefins (linear, cyclic, aromatic, and functionalized alkenes) to aldehydes. Mechanistic studies show that the oxidation reaction proceeds via a non-free-radical mechanism. The catalyst could be recovered and reused five times without major changes in activity for the oxidation of styrene to benzaldehyde.
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