| abstract |
The following amminium salt or diimmonium salt compounds which are appropriate for light recording media being excellent in record reproduction characteristics and storage stability, infrared cut filters being highly tolerant against light and heat, etc. The above compounds are amminium salt or diimmonium salt compounds consisting of an amminium cation represented by general formula (1), or a diimmonium cation represented by general formula (2), with an anion. In the above formulae, m is an integer of 1 or 2; and optionally substituted amino groups are attached respectively to the 4-positions of four phenyl groups B's bonded to two nitrogen atoms (quaternary nitrogen atoms in formula (2)) bonded to the ring A wherein at least one of these four amino groups is substituted by cyanoalkyl. <CHEM> |