Spectroscopic and Structural Characterization of Two Polymorphs of 1,1,4,4-Tetraphenyl-1,3-butadiene

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• 作者：Alberto Girlando ; Sandra Ianelli ; Ivano Bilotti ; Aldo Brillante ; Raffaele G. Della Valle ; Elisabetta Venuti ; Marcello Campione ; Stefano Mora ; Leonardo Silvestri ; Peter Spearman ; Silvia Tavazzi
• 刊名：Crystal Growth & Design
• 出版年：2010
• 出版时间：June 2, 2010
• 年：2010
• 卷：10
• 期：6
• 页码：2752-2758
• 全文大小：915K
• 年卷期：v.10,no.6(June 2, 2010)
• ISSN：1528-7505

文摘

We report a combined spectroscopic and structural study of polymorphism of 1,1,4,4-tetraphenyl-1,3-butadiene (TPB) blue luminescent crystals. We have identified two polymorphs, which can be grown by crystallization of the vapor. The first, α-TPB, has the monoclinic noncentrosymmetric structure (P2₁, two molecules per unit cell), whose lattice parameters have already been reported in the literature. The second, β-TPB, is a new polymorph, monoclinic centrosymmetric (P2₁/c, four molecules per unit cell). The previously reported triclinic structure, γ-TPB, has not been identified in samples grown by the physical vapor transport method. The effects of the different molecular configuration and packing of α- and β-TPB on Raman scattering, IR, and UV−vis optical properties are discussed.