| 摘要 |
Disclosed are novel aminium, diimonium, and polymethine borate dyes that have at least one absorption maximum in the infrared spectral region between about 700 and 2000 nm and that are useful as infrared absorbers, the anionic borate moiety having the formula: [BX<SUB>a</SUB>Y<SUB>b</SUB>]- in which a and b are integers with a ranging from 0 to 3 and b ranging from 1 to 4 and a + b = 4; X, which may be identical or different, are each a halogen atom, an OH functional group, or a C<SUB>1</SUB> to C<SUB>20</SUB> alkyl or alicyclic radical, and Y, which may be identical or different, are each a phenyl radical, at least one Y substituted by at least one element or electron-withdrawing substituent such as a perfluoroalkyl group, or by one or more halogen atoms, or an aryl radical containing at least two aromatic ring members, which may also be further substituted. Such dyes may be incorporated into films or bulk materials to form light filters for electromagnetic radiation, including laser radiation. |
