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Crystals 2018, 8(1), 22; doi:10.3390/cryst8010022

Controllable Molecular Packing Motif and Overlap Type in Organic Nanomaterials for Advanced Optical Properties

1
Key Laboratory of Yunnan Provincial Higher Education Institutions for Organic Optoelectronic Materials and Devices, Kunming University, Kunming 650214, China
2
Kunming DeepLand Nanomaterial Research Institute, Yunnan Ocean Organic Optoelectronic Technology Ltd., Kunming 650106, China
3
Department of Chemistry, Kunming University, Kunming 650214, China
4
Department of Physics and Astronomy and London Centre for Nanotechnology, University College London, Gower Street, London WC1E 6BT, UK
*
Authors to whom correspondence should be addressed.
Received: 3 November 2017 / Revised: 1 January 2018 / Accepted: 4 January 2018 / Published: 11 January 2018
(This article belongs to the Special Issue Advance in Crystalline Thin Wires)
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Abstract

The optical properties of organic materials are very sensitive to subtle structural modification, and a proper understanding of the structure-property relationship is essential to improve the performance of organic electronic devices. The phase transitions of the η-CuPc to the α-CuPc, then to the β-CuPc were investigated using In situ X-ray diffraction and the differential scanning calorimetry (DSC). The five stages in the phase-transition process from low to high-temperature were observed, which consisted of (1) the η-CuPc; (2) a mixture of the η- and α-CuPc; (3) a mixture of the η-, α- and β-CuPc; (4) a mixture of the α- and β-CuPc; and (5) the β-CuPc. The vibrational and optical properties at different phase-transition stages were correlated to molecular packing motif and molecule overlap type through systematic analyses of the Fourier–transform infrared, Raman and UV-VIS spectra. Moreover, the mechanism for the morphology evolution was also discussed in detail. View Full-Text
Keywords: nanomaterials; copper phthalocyanine; crystal structure; phase transition; optical properties; vibrational properties nanomaterials; copper phthalocyanine; crystal structure; phase transition; optical properties; vibrational properties
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Zou, T.; Wang, X.; Ju, H.; Zhao, L.; Guo, T.; Wu, W.; Wang, H. Controllable Molecular Packing Motif and Overlap Type in Organic Nanomaterials for Advanced Optical Properties. Crystals 2018, 8, 22.

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