Correction: Mixed azido/phenoxido bridged trinuclear Cu(ii) complexes of Mannich bases: Synthesis, structures, magnetic properties and catalytic oxidase activities

Abstract

Correction for ‘Mixed azido/phenoxido bridged trinuclear Cu(II) complexes of Mannich bases: Synthesis, structures, magnetic properties and catalytic oxidase activities’ by A. Ghosh et al., Dalton Trans., 2018, 47, 9385–9399. In response to the overestimation of kcat values for the oxidation of 3,5-di-tert-butylcatechol (3,5-DTBC) and o-aminophenol (OAP) catalysed by the complexes reported in the paper (Dalton Trans., 2018, 47, 9385–9399) that has been pointed out by Laura Gasque et al.,1 we regret that there are some mistakes and these have been corrected below. These corrections do not affect the discussion or conclusions of the original article. (1) We analyzed the kinetic data for oxidation of 3,5-DTBC to 3,5-DTBQ by the “integrated rate method” not by the “initial rate method”. Therefore, the sentence on page 9392, right column, last paragraph should be changed to “The kinetics of oxidation of 3,5-DTBC to 3,5-DTBQ by 1–3 were determined by the integrated rate method by monitoring the growth of the quinone band at 402 nm as a function of time”. (2) To avoid any confusion for readers, the caption of Fig. 6 should be changed to “Increase of the 3,5-DTBQ band at around 401 nm after mixing of equal volumes of 3,5-DTBC (1 × 10−2 M) and a methanolic solution of complex 2 (1 × 10−4 M). The spectra were recorded at 5 min intervals for 60 min”. (3) The calc. rate/“rate” factors calculated by Laura Gasque et al.1 for these complexes are incorrect, as the concentration of the catalyst and the concentration of the substrate are halved after mixing. This factor also depends upon the concentration of substrate. We have recalculated the calc. rate/“rate” factors for complexes 1–3 with the correct concentrations of catalyst and with different concentrations of substrate (Table 1). From these calculations, one can see that the calc. rate/“rate” factors do not exceed ∼5 for any of these compounds. They are close to ∼1 for lower concentrations of substrate as expected.