Vanadium complexes with multidentate amine bisphenols

: Hanninen MM, Peuronen A, Damlin P, Tyystjarvi V, Kivela H, Lehtonen A

Publisher: The Royal Society of Chemistry

: 2014

: Dalton Transactions

: Dalton Trans.

: 43

: 37

: 14022

: 14028

: 7

: 1477-9226

DOI: https://doi.org/10.1039/C4DT01007H

: http://dx.doi.org/10.1039/C4DT01007H

The reaction of VO(acac)2 (acac- = acetyl acetonate) with tripodal glycine bisphenol H3L1 under an ambient atmosphere yields a hexacoordinated vanadium(iv) complex [V(acac)(L1)] (1). The corresponding reactions with tripodal 2-propanolamine bisphenol H3L2 and potentially pentadentate ethoxyethanolamine bisphenol H3L3 lead to the oxidation of the metal centre and formation of mononuclear oxovanadium(v) complexes [VO(L2)] (2) and [VO(L3)] (3){,} respectively. Alternatively{,} these latter two complexes can be prepared using VOSO4[middle dot]5H2O or VO(OPr)3 as a precursor. The CV of 1 in an ACN solution shows a reversible one-electron process at E1/2 = +1.18 V{,} whereas 2 and 3 have an irreversible redox response at -1.6 V and -1.2 V{,} respectively. Complexes 2 and 3 show moderate activity in the epoxidation of cis-cyclooctene by tert-BuOOH at 50 [degree]C.