Fluorescent dyestuffs, processes for their preparation and their use as laser dyestuffs

• US 4,551,265 A
• Filed: 12/30/1981
• Issued: 11/05/1985
• Est. Priority Date: 09/20/1979
• Status: Expired due to Fees

• Current Assignee: Bayer AG
• Original Assignee: Bayer AG
• Inventors: Raue, Roderich, Schieder, Rudolf, Telle, Helmut, Brinkwerth, Wolfgang, Huffer, Wolfgang
• Primary Examiner(s): Niebling, John F.
• Application Number:
  US06/335,986
• Time in Patent Office: 1,406 Days
• Field of Search: 372/39-41, 372/53, 252/301.17
• US Class Current: 252/301.17
• CPC Class Codes: C09B 57/00 Other synthetic dyes of known constitution
• CPC Class Codes: C09K 11/06 containing organic luminescent materials
• CPC Class Codes: H01S 3/213 including an organic dye

Abstract

Fluorescent dyestuffs of the general formula ##STR1## wherein R and R¹ independently of one another represent hydrogen, a salt-forming cation, an alkyl radical with 1 to 16 C atoms or an aryl or aralkyl radical which is optionally substituted by non-chromophoric groups,

R² to R⁵ independently of one another represent hydrogen, alkyl, trifluoromethyl, alkoxy, aralkoxy, alkenoxy, aryloxy, halogen or a carboxyl, cyano, alkyl sulphone, aryl sulphone, aralkyl sulphone, carboxamide, sulphonamide or carboxylic acid ester group,

o, p, q and s independently of one another represent 1 or 2 and

m and n independently of one another denote 0, 1 or 2, it being possible for the sum of m and n to be 2 to 4,

processes for their preparation and their use as laser dyestuffs.

Claims

1. Process for producing a coherent laser emission in a wavelength range from 360 to 430 nm, wherein a solution of the dyestuff of the general formula ##STR63## is stimulated by an energy source which is capable of stimulating the dyestuff solution to produce a laser emission and wherein

R and R¹ independently of one another represent hydrogen, a salt-forming cation, an alkyl radical with 1 to 16 C atoms or an aryl or aralkyl radical which is optionally substituted by non-chromophoric groups,

R² to R⁵ independently of one another represent hydrogen, alkyl, trifluoromethyl, alkoxy, aralkoxy, alkenoxy, aryloxy, halogen or a carboxyl, cyano, alkyl sulphone, aryl sulphone, aralkyl sulphone, carboxamide, sulphonamide or carboxylic acid ester group,

o,p, q and s independently of one another represent 1 or 2 and

m and n independently of one another denote 0, 1 or 2, the sum of m and n being 2 to 4.