Photophysics of the acid and base forms of rhodamine B

✍ Scribed by P.J. Sadkowski; G.R. Fleming

• Publisher: Elsevier Science
• Year: 1978
• Tongue: English
• Weight: 321 KB
• Volume: 57
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(78)85313-5

✦ Synopsis

recehezl 113fay 1978 Fluorescence liie5rne measurements of rhodamine B in ethanol solution have confirmed the presence of tuo distinct species dependent on acidity. RotationaI diffusion tnnes of these species are identical and ue propose that they are the acid and base forms of -he dye_ Species having identical spectra to these forms hate also been obtained in concentration dependent studies and w-e believe that here, too, the equilibrium is acid-base rather than monomer-dimer as had been su__r_rested_ I _ Introduction Rhodamir;e dyes have been extensively investigated since the advent oi the dye laser. Of these, rhodamine B and rhodamine 6G are now argtrabiy the most widely ased iaser dyes and yet an anomaly seems to e_xist in their reported properties_ COOH rhodam nr 6G rhodamme B