This is quite a specific question, I know. I'm currently determining the absorption coefficients of a range of fluorescent materials and am a bit stuck with this one because I can't find its molecular weight anywhere. From literature I know Lumogen F Red 305 has Mw = 963.956 and Lumogen F Orange 240 has Mw = 710.873. It is necessary to know these so that the molar concentration can be determined which is essential in applying the Beer-Lambert law to determine the extinction coefficient. I've emailed BASF but the lumbering giant hasn't registered my existence.
Good point, I'll give that a try. I forget the obvious sometimes in my attempts to avoid using phones!
Hi Adam, did you get your answer?? I have the mass absorptivities (L g-1 cm-1) for quite a few of the Lumogen F dyes, and from these you can get to an absorption coefficient with a known plate thickness and optical density, .... however I don't have this for Pink 285:-( Regards, Bryce
Sadly not I'm afraid Bryce; I contacted BASF and the advisor didn't really know what this was (typical) but said they'd get a technical advisor to contact me back, which they didn't. Perhaps a follow up call with a bit more assertiveness would get me somewhere but I forgot about this along the way doing other things.
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