METAL COMPLEXES OF SUBSTITUTED CATECHOLATES AND REDOX FLOW BATTERIES CONTAINING THE SAME

摘要

Active materials for flow batteries can include various coordination compounds formed from transition metals. Some compositions containing coordination compounds can include a substituted catecholate ligand having a structure of;;in a neutral form or a salt form, in which Z is a heteroatom functional group bound to the substituted catecholate ligand at an open aromatic ring position and n is an integer ranging between 1 and 4. When more than one Z is present, each Z can be the same or different. Electrolyte solutions can include such coordination compounds, and such electrolyte solutions can be incorporated within a flow battery.

主权项

1. A composition comprising:
a coordination compound comprising a substituted catecholate ligand, the substituted catecholate ligand having a structure of in a neutral form or a salt form; wherein n is an integer ranging between 1 and 4, such that one or more Z are bound to the substituted catecholate ligand at an open aromatic ring position, each Z being the same or different when more than one Z is present; andwherein Z is a heteroatom functional group selected from the group consisting of A1RA1, A2RA2, A3RA3, and CHO;
wherein A1 is —(CH2)a— or —(CHOR)(CH2)a—, RA1 is —OR1 or —(OCH2CH2O)bR1, a is an integer ranging between 0 and about 6, with the proviso that R1 is not H when a is 0 and RA1 is —OR1, and b is an integer ranging between 1 and about 10;
wherein R is H, C1-C6 alkyl, heteroatom-substituted C1-C6 alkyl, or C1-C6 carboxyalkyl; andwherein R1 is H, methyl, ethyl, a C2-C6 polyol bound through an ether linkage or an ester linkage, or C1-C6 carboxyalkyl;wherein A2 is —(CH2)c— or —CH(OR2)(CH2)d—RA2 is —NR3R4, a carbon-linked amino acid, or —C(═O)XR5, X is —O— or —NR6—, c is an integer ranging between 0 and about 6, and d is an integer ranging between 0 and about 4;
wherein R2, R3, R4 and R6 are independently selected from the group consisting of H, C1-C6 alkyl, or heteroatom-substituted C1-C6 alkyl; andwherein R5 is H, C1-C6 alkyl, heteroatom-substituted C1-C6 alkyl, a C2-C6 polyol bound through an ester linkage, a hydroxyacid bound through an ester linkage, a polyglycol acid bound through an ester linkage, an amino alcohol bound through an ester linkage or an amide linkage, an amino acid bound through an ester linkage or an amide linkage, or —(CH2CH2O)bR1; andwherein A3 is —O— or —NR2—, RA3 is —(CHR7)eOR1, —(CHR7)eNR3R4, —(CHR7)eC(═O)XR5, or —C(═O)(CHR7)fR8, e is an integer ranging between 1 and about 6, with the proviso that e is not 1 when A3 is —O—, and f is an integer ranging between 0 and about 6;wherein R7 is H or OH; andwherein R8 is H, C1-C6 alkyl, heteroatom-substituted C1-C6 alkyl, a C2-C6 polyol bound through an ether linkage or an ester linkage, a hydroxyacid bound through an ether linkage or an ester linkage, a polyglycol acid bound through an ether linkage or an ester linkage, an amino alcohol bound through an ether linkage, an ester linkage, or an amide linkage, an amino acid bound through an ether linkage, an ester linkage, or an amide linkage, a carbon-linked amino acid, or —(OCH2CH2O)bR1.