We present a Raman investigation of polymorphism in 1,1,4,4-tetraphenyl-butadiene (TPB), a well-known blue luminescent molecule, which retains its emissive properties in the solid state. The use of low-wavenumber (10-150 cm-1) Raman microscopy, very sensitive to the crystal packing, allows us to single and pick up four different polymorphs. X-ray analysis shows that the TPB molecules assume different conformations in the various polymorphs, a fact revealed also by the Raman spectra in the region of intra-molecular vibrations. Lattice dynamics calculations yield a preliminary assignment of the low-wavenumber Raman spectra and provide information of the relative stability of the phases.
Alessia Bacchi, Ivano Bilotti, Aldo Brillante, Domenico Crocco, Raffaele G. Della Valle, Alberto Girlando, et al. (2013). Raman investigation of polymorphism in 1,1,4,4-tetraphenyl-butadiene. JOURNAL OF RAMAN SPECTROSCOPY, 44, 905-908 [10.1002/jrs.4278].
Raman investigation of polymorphism in 1,1,4,4-tetraphenyl-butadiene
BRILLANTE, ALDO;DELLA VALLE, RAFFAELE GUIDO;VENUTI, ELISABETTA
2013
Abstract
We present a Raman investigation of polymorphism in 1,1,4,4-tetraphenyl-butadiene (TPB), a well-known blue luminescent molecule, which retains its emissive properties in the solid state. The use of low-wavenumber (10-150 cm-1) Raman microscopy, very sensitive to the crystal packing, allows us to single and pick up four different polymorphs. X-ray analysis shows that the TPB molecules assume different conformations in the various polymorphs, a fact revealed also by the Raman spectra in the region of intra-molecular vibrations. Lattice dynamics calculations yield a preliminary assignment of the low-wavenumber Raman spectra and provide information of the relative stability of the phases.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
