The authors regret the omission of a grant number (No. K2-2020-023) from the Acknowledgements section of the published article. The grant no. K2-2020-023 should have been be given for the theoretical work supported by the Ministry of Education and Science of the Russian Federation in the framework of Increase Competitiveness Program of NUST ‘‘MISiS’’. The Royal Society of Chemistry apologises for these errors and any consequent inconvenience to authors and readers.