多官能团的萘磺酸如G酸等,长期以来大都用作染料中间体。由于各种官能团在萘环上相对位置的不同,这一类的许多化合物能够跟一些金属离子螯合,呈现各种颜色反应,用于一些金属的鉴定。其中有相当一部分邻氨基萘酚的重氮盐化合物,在一定的条件下具有光敏特性。邻氨基萘酚磷酸异构体的光分解速度,在紫外光照射下,已经测知。根据磺酸基在在萘环上的位置,按如下顺序依次降低: Polyfunctional naphthalene sulfonic acids such as G acid, etc., have long been mostly used as dye intermediates. Due to the relative positions of various functional groups on the naphthalene ring, many compounds in this group can chelate with some metal ions and exhibit various color reactions for the identification of some metals. Among them, a considerable part of the o-aminonaphthol diazonium salt compounds, under certain conditions, has photosensitive properties. O-aminonaphthol phosphate isomers of photolysis rate, in the ultraviolet light, has been measured. Depending on the position of the sulfonate groups on the naphthalene ring, the order of decreasing is: