Fluorescence emission modification of triphenylamine derivatives by aggregate formation in solution or by mechanical stress in solid state

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Table 2

Wavelengths and FWHM (Full Width at Half Maximum) of maximum emission bands for compounds 1–3 in the solid state (crystalline form, amorphous form, and after grinding).

Compound	1	2	2’	3	3’
λ_exc (nm)	355	365	365	365	365
λ_max (nm) cr	385	446	462	584	581
FWHM (cm⁻¹) / FWHM (nm) cr	1320 / 19	2831 / 59		2011 / 70
λ_max (nm) gr	-	442	478^*	589	602^*
FWHM (cm⁻¹) / FWHM (nm) gr		2644 / 53		2046 /73
λ_max (nm) am	^**	467	-	611	-
FWHM (cm⁻¹) / FWHM (nm) am	^**	3376 / 76		2248 / 90

^*Identified as amorphous after grinding [10]. ^**Obtention of a crystalline form. - Not performed (due to fast recrystallization) cr: crystalline; gr: grinded; am: amorphous. 2’ and 3’ are references from literature [10].

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