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 cm1) 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.
Raman investigation of polymorphism in 1,1,4,4-tetraphenyl-butadiene / Bacchi, A., Ivano, B., Aldo, B., Crocco, D., Raffaele G., D.V., Girlando, A., Masino, M., Pelagatti, P., Elisabetta, V.. - In: JOURNAL OF RAMAN SPECTROSCOPY. - ISSN 0377-0486. - 44:6(2013), pp. 905-908. [10.1002/jrs.4278]
Raman investigation of polymorphism in 1,1,4,4-tetraphenyl-butadiene
BACCHI, Alessia;CROCCO, Domenico;GIRLANDO, Alberto;MASINO, Matteo;PELAGATTI, Paolo;
2013-01-01
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 cm1) 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.
