| 摘要 |
FIELD: chemistry.SUBSTANCE: invention relates to substrate bleaching. A method of treating a substrate by bringing the substrate into contact with an aqueous medium containing at least 1% water and 1 to 1500 mM hydrogen peroxide to form a medium is described. The aqueous medium contains a transition metal catalyst obtained in advance. The catalyst is a binuclear catalyst based on a transition metal of the type Mn(II)Mn(II), Mn(II)Mn(III), Mn(III)Mn(III), Mn(III)Mn(IV) or Mn(IV)Mn(IV). The ligand of the transition metal catalyst has the formula(I), where Q =, where p = 3, R is independently selected from hydrogen; C-C-alkyl; wherein one of R is bonded with N from another Q from another ring through an ethylene bridge; R, R, Rand Rare independently selected from: H and C-C-alkyl. The medium has pH in the range of 11 to 13. The concentration of the catalyst is in the range of 0.0001 to 1.5 mcM.EFFECT: bleaching substrates.24 cl, 5 tbl |
