Supramolecular structures in oxovanadium(IV) compounds with pyrid-2-one and pyrid-4-one ligands

Author(s)

Pesci, Rafaela B. P. ^{[1, 2]} ; de Souza, Eliseu J. ^[3] ; Niquet, Elke ^[4] ; Nascimento, Otaciro R. ^[5] ; Viana, Rommel B. ^{[1, 6]} ; Deflon, Victor M. ^[1]

Affiliation

^[1] Univ Sao Paulo, Inst Quim Sao Carlos, Sao Carlos, SP - Brazil

^[2] Univ Fed Paraiba UFPB, Dept Quim, Joao Pessoa, Paraiba - Brazil

^[3] Univ Brasilia UnB, Inst Quim, Brasilia, DF - Brazil

^[4] Univ Tubingen, Inst Anorgan Chem, Tubingen - Germany

^[5] Univ Sao Paulo, Inst Fis Sao Carlos, Sao Carlos, SP - Brazil

^[6] Univ Fed Alfenas UNIFAL, Inst Quim, Alfenas, MG - Brazil

• Document type: Journal article
• Source: Journal of Molecular Structure; v. 1194, p. 104-111, OCT 15 2019.
• Web of Science Citations: 0

Abstract

The aim of this study is to perform an analysis of the spectroscopic and electronic properties of three vanadium(IV) complexes formed from bis(acetylacetonato)oxoyanadium(IV) {[}VO(acac)(2)] and pyrid-2-one (2pyon) or pyrid-4-one (4pyon) ligands: {[}VO(acac)(2)(2pyon)] (1), {[}VO(acac)(2)(4pyon)] (2) and {[}VO(acac)(2)(H2O)]center dot 4pyon (3). In 1 and 2, the pyridone ligand coordinates neutral and monodentate to the vanadium center, with the oxygen atom placed in the axial trans position to the oxo ligand. In 3, the 4pyon ligand remains outside the metal first coordination sphere but bound to the aqua ligand through hydrogen bonds that led to the formation of a supramolecular structure. Moreover, the Density Functional Theory (DFT) were applied to answer two overarching aspects. First, in complexes 1 and 2, the DFT analysis was used to establish the most stable configuration among the vanadium pyridone complex isomers, comparing the ligand via O-bound pyridone and N-bound hydroxypyridine chelating modes. Second, DFT was also performed to enable understanding of the intermolecular interactions between the 4pyon and the {[}VO(acac)(2)(H2O)] moiety to elucidate the intermolecular interactions in 3. Further insights were also obtained by applying the Natural Bond Orbital analysis (NBO) along with a topological perspective via the use of the Quantum Theory of Atoms in Molecules (QTAIM). (C) 2019 Elsevier B.V. All rights reserved. (AU)

• FAPESP's process: 12/19175-2 - Characterization of metal complexes with medicinal applications: a spectroscopy and a quantum chemical investigation
• Grantee: Rommel Bezerra Viana
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 09/54011-8 - Acquisition of a single-crystal X-ray diffractometer for the structural analysis of small molecules and proteins
• Grantee: Victor Marcelo Deflon
• Support Opportunities: Multi-user Equipment Program