Article Dans Une Revue Dalton Transactions Année : 2025

Influence of ancillary ligands on the formation and functionality of oxovanadium( v ) metallosupramolecular assemblies: advanced computational and catalytic analyses

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A coordination-driven self-assembly approach offers an opportunity for designing metallosupramolecular architectures with tailored properties. Applying this strategy, we present the synthesis and detailed characterization of tetranuclear and polynuclear vanadium(V) compounds with an aroylhydrazone ligand. These assemblies were obtained using the 3-methoxy-2-hydroxybenzaldehyde isonicotinoyl hydrazone ligand (H2VIH) and NH4VO3 in the presence of primary aliphatic alcohols with increasing carbon chain length (from one to five carbon atoms). Reactions of lower alcohols selectively yielded metallocyclic compounds [VO(VIH)(OR)]4 (1, 2, and 3, where R = CH3, C2H5, and C3H7, respectively), while reactions of higher alcohols afforded infinite zig-zag chain polymers [VO(VIH)(OR)]n (4 and 5, where R = C4H9 and C5H11, respectively). Their formation was studied experimentally and computationally. Quantum chemical calculations using density functional theory provided valuable insights into the stability of both cyclic and chain assemblies. The solid-state structures of 1–5 and pseudopolymorphs of [VO2(HVIH)] (6·0.5H2O·0.5CH3OH and 6·2H2O) were confirmed using single-crystal and powder X-ray diffraction methods. The oxovanadium(V) species were tested as catalysts for cyclooctene and benzyl alcohol oxidation, with results correlated with those for analogous molybdenum complexes [MoO2(VIH)]4 (7) and [MoO2(VIH)(C2H5OH)] (8). The influence of the metal centre, nuclearity, and ancillary ligand identity on catalytic performance was also investigated, revealing that the vanadium metal center influences the catalytic activity due to its capacity to form robust structures.

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hal-05065012 , version 1 (13-05-2025)

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Edi Topić, Josipa Sarjanović, Danijela Musija, Mirna Mandarić, Andrea Cocut, et al.. Influence of ancillary ligands on the formation and functionality of oxovanadium( v ) metallosupramolecular assemblies: advanced computational and catalytic analyses. Dalton Transactions, 2025, 54 (13), pp.5532-5545. ⟨10.1039/D5DT00105F⟩. ⟨hal-05065012⟩
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