Volume 2016, Issue 10 p. 1604-1618
Full Paper

Synthesis, Theoretical Study and Catalytic Application of Oxidometal (Mo or V) Complexes: Unexpected Coordination Due to Ligand Rearrangement through Metal-Mediated C–C Bond Formation

Sagarika Pasayat

Sagarika Pasayat

Department of Chemistry, National Institute of Technology, Rourkela 769008 Odisha, India, http://https://sites.google.com/site/drrupamdinda/

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Michael Böhme

Michael Böhme

Institute of Inorganic and Analytical Chemistry, Chair of Inorganic Chemistry II, Friedrich Schiller University Jena, Humboldtstr. 8, 07743 Jena, Germany, http://www.plass.uni-jena.de/

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Sarita Dhaka

Sarita Dhaka

Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee 247667, India

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Subhashree P. Dash

Subhashree P. Dash

Department of Chemistry, National Institute of Technology, Rourkela 769008 Odisha, India, http://https://sites.google.com/site/drrupamdinda/

Department of Chemistry, Indira Gandhi Institute of Technology, Sarang, Parjang, Dhenkanal 759146, India

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Sudarshana Majumder

Sudarshana Majumder

Department of Chemistry, National Institute of Technology, Rourkela 769008 Odisha, India, http://https://sites.google.com/site/drrupamdinda/

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Mannar R. Maurya

Mannar R. Maurya

Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee 247667, India

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Winfried Plass

Corresponding Author

Winfried Plass

Institute of Inorganic and Analytical Chemistry, Chair of Inorganic Chemistry II, Friedrich Schiller University Jena, Humboldtstr. 8, 07743 Jena, Germany, http://www.plass.uni-jena.de/

Winfried Plass, Institute of Inorganic and Analytical Chemistry, Chair of Inorganic Chemistry II, Friedrich Schiller University Jena, Humboldtstr. 8, 07743 Jena, Germany

Rupam Dinda, Department of Chemistry, National Institute of Technology, Rourkela 769008 Odisha, India

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Werner Kaminsky

Werner Kaminsky

Department of Chemistry, University of Washington, Box 351700, Seattle, WA 98195, USA

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Rupam Dinda

Corresponding Author

Rupam Dinda

Department of Chemistry, National Institute of Technology, Rourkela 769008 Odisha, India, http://https://sites.google.com/site/drrupamdinda/

Winfried Plass, Institute of Inorganic and Analytical Chemistry, Chair of Inorganic Chemistry II, Friedrich Schiller University Jena, Humboldtstr. 8, 07743 Jena, Germany

Rupam Dinda, Department of Chemistry, National Institute of Technology, Rourkela 769008 Odisha, India

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First published: 07 March 2016
Citations: 30

Dedicated to Professor Ekkehardt Fluck on the occasion of his 85th birthday

Graphical Abstract

Two unique dioxidomolybdenum(VI) complexes [MoO2L′1–2] (1 and 2) containing ligands generated by metal-mediated interligand C–C bond formation are reported and are investigated by DFT calculations. Unique observations not found in the corresponding vanadium(V) complexes [VO2L1–2] (3 and 4) and the catalytic potentials of 14 are disclosed.

Abstract

Two novel dioxidomolybdenum(VI) complexes [MoO2L′1] (1) and [MoO2L′2] (2) containing the MoO22+ motif with unexpected coordination motifs due to ligand rearrangement through Mo-mediated interligand C–C bond formation are reported. The ligands (H2L′1–2) are tetradentate C–C-coupled O2N2-donor systems formed in situ during synthesis of the complexes by reaction of [MoVIO2(acac)2] with Schiff base ligands of 2-aminophenol with 2-pyridinecarbaldehyde (HL1) and 2-quinolinecarbaldehyde (HL2). To confirm that the ligand rearrangement is assisted by molybdenum, the corresponding vanadium complexes [VO2L1] (3) and [VO2L2] (4) containing original Schiff base ligand (HL1,2) are also reported here. All complexes 14 are characterized by several physicochemical techniques and the structural features of 1 and 2 have been solved by X-ray crystallography. The proposed mechanism of molybdenum-mediated interligand C–C bond formation is supported by DFT calculations including the comparisons with the synthesized vanadium analogues. The catalytic potentials of 14 for the epoxidation of styrene and cyclohexene have also been explored.