Correction to: Transition Metal Chemistry (2018) 43:571–577 https://doi.org/10.1007/s11243-018-0243-3

After the publication of this article ‘Bis-chelates of nickel(II) and copper(II) with an O,S-donor piperazine ligand,’ it came to our attention that Debashis Ray was omitted from the list of authorship. Debashis Ray supervised this work at IIT Kharagpur and has been added as an author to this publication. The authors would also like to clarify that this work was carried out at the Department of Chemistry, Indian Institute of Technology (IIT) Kharagpur and this is the affiliation for both authors for this article. During this work, Haridas Mandal was a Ph.D. student at IIT Kharagpur, working under the supervision of Prof. Ray. He has since moved to the Chemical Division, Southern Region, Geological Survey of India, and this is his current affiliation. Dr. Mandal is thankful to the Department of Science and Technology, Govt. of India, New Delhi, for providing the single-crystal X-ray diffractometer in the Department of Chemistry, IIT Kharagpur, under its FIST program.