Tetraazaporphyrins and optical recording medium

US5032495A · kind A · utility

Assignee

• BASF SE

Inventors

• Bernhard Albert · Monsheim, DE
• Peter Neumann · Wiesloch, DE
• Rolf-Dieter Kohler · Edingen-Neckarhausen, DE

Key dates

• Filing date: Aug 18, 1989
• Grant date: Jul 16, 1991
• Expiry date: Aug 18, 2009

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S430/146
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

An optical recording medium contains tetraazaporphyrins of the formula ##STR1## where L.sup.1, L.sup.2, L.sup.3 and L.sup.4 are each independently of the others the radical of a bicyclic aromatic heterocycle containing 1 to 3 identical or different heteroatoms selected from the group consisting of N, O and S, which may be substituted, and PA0 R.sup.1 and R.sup.2 have defined meanings.