PROCESSES FOR FORMING COORDINATION COMPLEXES CONTAINING MONOSULFONATED CATECHOLATE LIGANDS
First Claim
1. A method comprising:
- providing a neat mixture of catechol and a sub-stoichiometric amount of sulfuric acid relative to the catechol;
heating the neat mixture to form a reaction product comprising a mixture of catechol and a monosulfonated catechol or a salt thereof; and
without separating the catechol and the monosulfonated catechol or the salt thereof from one another, forming a coordination complex from the reaction product having a metal center with at least one unsubstituted catecholate ligand and at least one monosulfonated catecholate ligand bound thereto.
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Accused Products
Abstract
Coordination complexes can have a metal center with at least one unsubstituted catecholate ligand and at least one monosulfonated catecholate ligand or a salt thereof bound thereto. Some coordination complexes can have a formula of DgTi(L1)x(L2)y, in which D is a counterion selected from NH4+, Li+, Na+, K+, or any combination thereof; g ranges between 2 and 6; L1 is an unsubstituted catecholate ligand; L2 is a monosulfonated catecholate ligand; and x and y are non-zero numbers such that x+y=3. Methods for synthesizing such coordination complexes can include providing a neat mixture of catechol and a sub-stoichiometric amount of sulfuric acid, heating the neat mixture to form a reaction product containing catechol and a monosulfonated catechol or a salt thereof, and forming a coordination complex from the reaction product without separating the catechol and the monosulfonated catechol or the salt thereof from one another.
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Citations
28 Claims
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1. A method comprising:
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providing a neat mixture of catechol and a sub-stoichiometric amount of sulfuric acid relative to the catechol; heating the neat mixture to form a reaction product comprising a mixture of catechol and a monosulfonated catechol or a salt thereof; and without separating the catechol and the monosulfonated catechol or the salt thereof from one another, forming a coordination complex from the reaction product having a metal center with at least one unsubstituted catecholate ligand and at least one monosulfonated catecholate ligand bound thereto. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method comprising:
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providing a neat mixture of catechol and up to about 0.7 stoichiometric equivalents of sulfuric acid relative to the catechol; heating the neat mixture at a temperature of about 80°
C. or above to form a reaction product comprising a mixture of catechol and a monosulfonated catechol or a salt thereof, the monosulfonated catechol being 3,4-dihydroxybenzenesulfonic acid;without separating the catechol and the monosulfonated catechol or the salt thereof from one another, forming a coordination complex from the reaction product having a metal center with at least one unsubstituted catecholate ligand and at least one monosulfonated catecholate ligand bound thereto; combining an aqueous base with the coordination complex; and obtaining an aqueous solution of the coordination complex. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22)
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23. A composition comprising:
a coordination complex dissolved in an aqueous solution having an alkaline pH, the coordination complex having a metal center with at least one unsubstituted catecholate ligand and at least one monosulfonated catecholate ligand or a salt thereof bound thereto, the at least one monosulfonated catecholate ligand being 3,4-dihydroxybenzenesulfonic acid; wherein the coordination complex bears an overall negative charge and at least one positively charged monovalent counterion maintains charge balance. - View Dependent Claims (24, 25, 26, 27, 28)
Specification