| 摘要 |
A compound of Formula (1) or a salt thereof: wherein: A1 and A2 are each independently optionally substituted aryl; Q1 and Q2 are each independently an optionally substituted arylene or polycyclic heteroarylene group each comprising a phenylene ring which is para connected to the -N-N- and the -NR- groups shown in Formula (1); each R is independently H or a substituent; each X is independently selected from O, S or NRa wherein Ra is H or a substituent, provided that at least one of the groups represent by X is O or S; L is a linking group; and provided that the groups represented by the formula XLX do not contain any group selected from sulfonic acid, phosphonic acid, carboxylic acid and sulfonamide groups. Inks containing these compounds, have particularly good ozone-fastness, optical density, colour space and especially good light-fastness.
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