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. 2021 Aug 2;9:692939. doi: 10.3389/fchem.2021.692939

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Copyright © 2021 Qiu, Cui, Ge, Kurmoo, Ma and Su.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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SCHEME 1 — The synthetic method for TTF Schiff-base ligand (H₂L), precursor [Fe^ⅡL (CH₃OH)₂], [Fe^IIL (TPPE)_0.5] (1) and [(Fe^II ₃L₃ (TPPE)_1.5)] (2).