Patent ID: 6908492

Claim:
A 7-nitro-2,1,3-benzoxadiazole or 7-nitro-2,1,3-benzthiadiazole compound of formula (I): wherein X is sulfur or oxygen; Y 1 and Y 2 are the same or different and, independently of each other, each represent a nitrogen atom or a nitrogen monoxide group; R1 and R2 are the same or different and, independently of one another, each represent hydrogen, a halogen atom, a (C 1 -C 4 )-alkyl group, a substituted (C 1 -C 4 )-alkyl group substituted with a halogen atom, a (C 1 -C 4 )-alkoxy group, a nitro group or an NR a R b group, the R a and R b are the same or different and, independently of one another, each represent hydrogen, a (C 1 -C 4 )-alkyl group, an optionally substituted, aromatic carbocyclic group or a (C 1 -C 4 )-alkane carbonyl group; V and W together form an aliphatic ring, an aromatic isocyclic ring or a heterocyclic ring system; and Kat + represents an alkali cation, an alkaline earth cation, a quaternary ammonium group, a quatemary phosphonium group or a sulfonium group.