Patent ID: 8735444

Claim:
A fluorinated 3,6-diaminoxanthene compound represented by the following structural formulae Ib, Ie, Ig or Ij and wherein in each of formulae Ib, Ie, Ig and Ij X 3 =5-COOH or 6-COOH or an ester thereof, and substituents R 12 , R 22 , X 2 , Y 1 , Y 2 , alone or two substituents taken together, is (are) hydrogen atoms or any alkyl, cycloalkyl, heterocycloalkyl, aryl, heterocyclic aryl groups, or any functionally substituted alkyl, cycloalkyl, aryl, heterocyclic aryl groups, or any combination of the said groups; and wherein in each of formulae Ib, Ie, Ig and Ij Z=OR 3 or NR 4 R 5 , where R 3 , R 4 and R 5 is (are) hydrogen atom(s), any alkyl, cycloalkyl, heterocycloalkyl, aryl, heterocyclic aryl group(s), or any functionally substituted alkyl, cycloalkyl, aryl, heterocyclic aryl group(s), or any combination of the said groups.