Bleach catalysts and formulations containing them

A bleach catalyst of formula (IV):

• wherein Fe represents an iron atom in oxidation state II or III, X is a group which is either a bridge or is not a bridge between iron atoms, Y is a counter-ion, x and y being >=1, 0=<n=<3, and z being the charge of the metal complex, and p=z/ charge of Y;
• R1 and R2 being independently one or more ring substituents selected from hydrogen and electron donating and withdrawing groups selected from:
• halo, C1-6alkoxy, hydroxy, hydroxyalkyl, (optionally mono-or di-substituted) amine groups, (optionally mono- or di-substitued) thiol groups, carboxyl, ester, amide, substituted carbonyl groups in general, nitrile, nitro, (optionally substituted) sulphonyl, alkenyl, aryl, quarternary ammonium (+) and sulphonium (+);
• R3-R8 being independently hydrogen, alkyl, hydroxyalkyl, alkenyl or variants of any of these when substituted by one or more electron donating or withdrawing groups selected from:
• halo, C1-6alkoxy, hydroxy, hydroxyalkyl, (optionally mono-or di-substituted) amine groups, (optionally mono- or di-substitued) thiol groups, carboxyl, ester, amide, substituted carbonyl groups in general, nitrile, nitro (optionally substituted) sulphonyl, alkenyl, aryl, quarternary ammonium (+) and sulphonium (+) with the proviso that in the bleach catalyst of formula (IV) the following ligand is excluded:
• wherein in case 1, both T═CH3,
• wherein in case 2, T═H or
• where m is 0 or an integer of 1, 2, 3 or 4;
• n is an integer of 1, 2 or 3;
• J1 and J2=H or F, wherein in case 3, T=—CH2COOH, —CH2P(O)OHW
• where W is OH or, C1-C5-alkyl or —O—(C1-C5)-alkyl, or
• where K1=—OH or —OCH3 K2 is —NO2, —NH3, isothiocyanato, semicarbazido, thiosemicarbazido, maleimido, bromoacetamido or carboxyl.