The presented work gives an overview of the known coordination compounds of zinc(II) with piperazine and its three substituted derivatives, i.e., 1-methylpiperazine, 1-ethylpiperazine and N-(2-hydroxyethyl)pieprazine, as ligands. Compounds with known crystal structures were subjected to this study. Crystallographic database CSD was surveyed. The program Mercury was used to analyse the results of the literature survey. The study has focused on the ligands' binding modes. A correlation with the synthetic conditions was sought in case of unexpected coordination modes.
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