Patent ID: 8648193

Claim:
A dinitroxide-type biradical compound comprising: a rigid linkage between the two nitroxide units that maintains a specific orientation and distance between the two aminoxyl groups of these units, said rigid linkage being an odd number of spiranic bonds, wherein the dinitroxide-type biradical compounds are of the general formula: in which X is a single bond between the atoms n−1 and n+1, or O, N, N(O), S, S(O), SO2, or a (C1-C4) alkyl chain, in which Y1 is a single bond between the atoms n−1 and n+1, or O, N, N(O), S, S(O), SO2, or a (C1-C4) alkyl chain, in which Y2 is a single bond between the atoms n−1 and n+1, or O, N, N(O), S, S(O), SO2, or a (C1-C4) alkyl chain, in which Z1=—R1 or —R1-R2 and Z2=—R1 or —R1-R2, where R1 is selected from the group consisting of a chain of (C1-C17) alkyl, cycloalkyl, heterocycloalkyl, spirocycloalkyl, spiroheterocycloalkyl, alkenyl, alkynyl, (C6-C18) aryl, and R2 is selected from the group consisting of H, hydroxyl (—OH), primary amine (—NH2), secondary amine (—NH), tertiary amine (—N), ammonio (—N + ), amine oxide (—NO), carboxyl (—COOH), sulfanyl (—SH), polyethylene-glycol (CH2-CH2-O)n-CH2X, X being OH or NH2), sulfinyl (—SO), sulfonyl (—SO2), sulfonato (—SO 3 − ), phosphono (—PO3H2, —PO3R2 where R is (C1-C17) alkyl or (C6-C18) aryl), phosphoryl (—P(O)R2 where R—(C1-C17) alkyl, (C6-C18) aryl), phosphonio (—P + ), phosphoric ester (—O—PO 3 − ), wherein the dinitroxide-type biradical compounds further include the addition of at least one chemical group that facilitates solubility, selected from among the functions and groups of hydroxyl (—OH), primary amine (—NH2), secondary amine (—NH), tertiary amine (—N), ammonio (—N + ), amine oxide (—NO), carboxyl (—COOH), sulfonyl (—SH), polyethylene-glycol (CH2-CH2-O)n-CH2X, where X is OH or NH2) sulfinyl (—SO), sulfonyl (—SO2), sulfonato (—SO 3 − ), phosphono (—PO3H2, —PO3R2 where R is (C1-C17) alkyl or (C6-C18) aryl), phosphoryl (—P(O)R2 where R is (C1-C17) alkyl or (C6-C18) aryl), phosphonio (—P + ), phosphoric ester (—O—PO 3 − ).