Mixed chalcogenide pyrylium salts of a Lewis base
US4916127A · kind A · utility
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2References
3Claims
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Inventor
Key dates
| Filing date | Oct 24, 1988 |
| Grant date | Apr 10, 1990 |
| Priority date | — |
| Expiry date | Oct 24, 2008 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09B23/06
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
There are disclosed certain pyrylium salts and a method of making them. The dyes are useful both medicinally in photodynamic therapy and in photoconductive compositions, photoresist and lithographic compositions or optical recording discs. The salts are mixed seleno- or telluropyrylium compounds having a singlet oxygen quantum efficiency of at least 0.005 when exposed as described at wavelengths between about 650 and 1000 nanometers, and a Lewis base anion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.