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1. (WO2017151153) COORDINATION COMPLEXES CONTAINING MONOSULFONATED CATECHOLATE LIGANDS AND METHODS FOR PRODUCING THE SAME

Pub. No.:    WO/2017/151153    International Application No.:    PCT/US2016/021857
Publication Date: Sat Sep 09 01:59:59 CEST 2017 International Filing Date: Fri Mar 11 00:59:59 CET 2016
IPC: H01M 4/60
H01M 8/20
C07F 7/28
Applicants: LOCKHEED MARTIN ENERGY, LLC
Inventors: HUMBARGER, Scott, Thomas
MILLARD, Matthew
Title: COORDINATION COMPLEXES CONTAINING MONOSULFONATED CATECHOLATE LIGANDS AND METHODS FOR PRODUCING THE SAME
Abstract:
Flow batteries and other electrochemical systems can contain an active material that is a coordination complex having at least one monosulfonated catecholate ligand or a salt thereof bound to a metal center. The monosulfonated catecholate ligand has a structure of : formula (1) More particularly, the coordination complex can be a titanium coordination complex with a formula of DgTi(L1)(L2)(L3), in which D is a counterion selected from H, NH4+, Li+, Na+, K+, or any combination thereof; g ranges between 3 and 6; and L1, L2 and L3 are ligands, where at least one of L1, L2 and L3 is a monosulfonated catecholate ligand. Methods for synthesizing such monosulfonated catecholate ligands can include providing a neat mixture of catechol and up to about 1.3 stoichiometric equivalents of sulfuric acid, and heating the neat mixture at a temperature of about 80°C or above to form 3,4-dihydroxybenzenesulfonic acid or a salt thereof.