| 摘要 |
Phthalocyanine compounds substituted by from 1 to 8 substituents of formula (-O-R-O-) wherein R is a 1,2-arylene group are provided. Preferably, the phthalocyanine compounds are substituted by catechol. Additional substituents which may be present include hydrocarlyloxy, hydrocarbylthio, halogen and sulphonic acid or a salt thereof.
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