Jump to main content
Jump to site search


The first pentagonal-bipyramidal vanadium (III) complexes with a Schiff-base N3O2 pentadentate ligand: synthesis, structure and magnetic properties

Abstract

A series of three mononuclear pentagonal-bipyramidal V(III) complexes with the equatorial pentadentate N3O2 ligand (2,6-diacethylpyridinebis(benzoylhydrazone), H2DAPBH) in the different charge states (H2DAPBH0, HDAPBH1-, DAPBH2-) and various apical ligands (Cl-, CH3OH, SCN-) was synthesized and characterized structurally and magnetically: [V(H2DAPBH)Cl2]Cl·C2H5OH (1), [V(HDAPBH)(NCS)2]·0.5CH3CN·0.5CH3OH (2) and [V(DAPBH)(CH3OH)2]Cl·CH3OH (3). All three complexes reveal paramagnetic behavior, resulting from isolated S = 1 spins with positive zero-field splitting energy expected for the high-spin ground state of V3+ (3d2) ion in a PBP coordination. Detailed high-field EPR measurements for compound 3 show that its magnetic properties are best described by the spin Hamiltonian with the positive ZFS energy (D = +4.1 cm-1) and pronounced dimer-like antiferromagnetic spin coupling (J = -1.1 cm-1). Theoretical analysis based on superexchange calculations reveals that the long-range spin coupling between distant V3+ ions (8.65 Å) is mediated through π-stacking contacts between the planar DAPBH2- ligands of two neighboring [V(DAPBH)(CH3OH)2]+ complexes.

Back to tab navigation

Supplementary files

Article information


Submitted
04 Sep 2020
Accepted
05 Oct 2020
First published
05 Oct 2020

Dalton Trans., 2020, Accepted Manuscript
Article type
Paper

The first pentagonal-bipyramidal vanadium (III) complexes with a Schiff-base N3O2 pentadentate ligand: synthesis, structure and magnetic properties

T. A. Bazhenova, L. Zorina, S. Simonov, V. S. Mironov, O. Maximova, L. Spillecke, C. Koo, R. Klingeler, Y. Manakin, A. N. Vasiliev and E. B. Yagubskii, Dalton Trans., 2020, Accepted Manuscript , DOI: 10.1039/D0DT03092A

Social activity

Search articles by author

Spotlight

Advertisements