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Bernardinelli OD, Faria GC, de Oliveira Nunes LA, Faria RM, deAzevedo ER, Pinto MFS. Correlation between molecular conformation, packing, and dynamics in oligofluorenes: a theoretical/experimental study. J Phys Chem A 2012; 116:4285-95. [PMID: 22471613 DOI: 10.1021/jp210953m] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Fluorene-based systems have shown great potential as components in organic electronics and optoelectronics (organic photovoltaics, OPVs, organic light emitting diodes, OLEDs, and organic transistors, OTFTs). These systems have drawn attention primarily because they exhibit strong blue emission associated with relatively good thermal stability. It is well-known that the electronic properties of polymers are directly related to the molecular conformations and chain packing of polymers. Here, we used three oligofluorenes (trimer, pentamer, and heptamer) as model systems to theoretically investigate the conformational properties of fluorene molecules, starting with the identification of preferred conformations. The hybrid exchange-correlation functional, OPBE, and ZINDO/S-CI showed that each oligomer exhibits a tendency to adopt a specific chain arrangement, which could be distinguished by comparing their UV/vis electronic absorption and (13)C NMR spectra. This feature was used to identify the preferred conformation of the oligomer chains in chloroform-cast films by comparing experimental and theoretical UV/vis and (13)C NMR spectra. Moreover, the oligomer chain packing and dynamics in the films were studied by DSC and several solid-state NMR techniques, which indicated that the phase behavior of the films may be influenced by the tendency that each oligomeric chain has to adopt a given conformation.
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Liao ML, Ju SP, Chang CY, Huang WL. Size and chain length effects on structural behaviors of biphenylcyclohexane-based liquid crystal nanoclusters by a coarse-grained model. J Mol Model 2011; 18:2321-31. [PMID: 21975541 DOI: 10.1007/s00894-011-1254-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2011] [Accepted: 09/21/2011] [Indexed: 11/27/2022]
Abstract
Size and chain length effects on structural behaviors of liquid crystal nanoclusters were examined by a coarse-grained model and the configurational-bias Monte Carlo (CBMC) simulation. The nanoclusters investigated in this study are composed of the biphenylcyclohexane-based BCH5H liquid crystal molecule and its derivatives. Results of the study show that the average energy decreases (i.e., more negative) as the cluster size (i.e., the number of molecules) increases. With the increasing cluster size, the equilibrium conformation of the nanocluster changes gradually from a pipe-like structure (for the smaller systems) to a ball-like cluster (for the larger systems). The order parameter of the system reduces with the transition of the equilibrium conformation. Regarding the chain length effect, the pipe-like equilibrium conformation (for the smaller systems) was observed more close to a pipe as the length of the tail alkyl chain of the derivatives extended. However, due to the flexibility of the tail alkyl chain, the pipe conformation of the system deflects slightly about its cyclohexyl group as the tail extends further.
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Affiliation(s)
- Ming-Liang Liao
- Department of Aircraft Engineering, Air Force Institute of Technology, Kaohsiung, Taiwan, Republic of China
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Bacchiocchi C, Hennebicq E, Orlandi S, Muccioli L, Beljonne D, Zannoni C. "Reduced" Distributed Monopole Model for the Efficient Prediction of Energy Transfer in Condensed Phases. J Phys Chem B 2008; 112:1752-60. [DOI: 10.1021/jp076732w] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Corrado Bacchiocchi
- Dipartimento di Chimica Fisica e Inorganica and INSTM, Università di Bologna, Viale Risorgimento 4, I-40136 Bologna, Italy, Laboratory for Chemistry of Novel Materials and Center for Research in Molecular Electronics and Photonics, University of Mons-Hainaut, Place du Parc 20, B-7000 Mons, Belgium, and School of Chemistry and Biochemistry and Center for Organic Photonics and Electronics, Georgia Institute of Technology, Atlanta, Georgia 30332-0400
| | - Emmanuelle Hennebicq
- Dipartimento di Chimica Fisica e Inorganica and INSTM, Università di Bologna, Viale Risorgimento 4, I-40136 Bologna, Italy, Laboratory for Chemistry of Novel Materials and Center for Research in Molecular Electronics and Photonics, University of Mons-Hainaut, Place du Parc 20, B-7000 Mons, Belgium, and School of Chemistry and Biochemistry and Center for Organic Photonics and Electronics, Georgia Institute of Technology, Atlanta, Georgia 30332-0400
| | - Silvia Orlandi
- Dipartimento di Chimica Fisica e Inorganica and INSTM, Università di Bologna, Viale Risorgimento 4, I-40136 Bologna, Italy, Laboratory for Chemistry of Novel Materials and Center for Research in Molecular Electronics and Photonics, University of Mons-Hainaut, Place du Parc 20, B-7000 Mons, Belgium, and School of Chemistry and Biochemistry and Center for Organic Photonics and Electronics, Georgia Institute of Technology, Atlanta, Georgia 30332-0400
| | - Luca Muccioli
- Dipartimento di Chimica Fisica e Inorganica and INSTM, Università di Bologna, Viale Risorgimento 4, I-40136 Bologna, Italy, Laboratory for Chemistry of Novel Materials and Center for Research in Molecular Electronics and Photonics, University of Mons-Hainaut, Place du Parc 20, B-7000 Mons, Belgium, and School of Chemistry and Biochemistry and Center for Organic Photonics and Electronics, Georgia Institute of Technology, Atlanta, Georgia 30332-0400
| | - David Beljonne
- Dipartimento di Chimica Fisica e Inorganica and INSTM, Università di Bologna, Viale Risorgimento 4, I-40136 Bologna, Italy, Laboratory for Chemistry of Novel Materials and Center for Research in Molecular Electronics and Photonics, University of Mons-Hainaut, Place du Parc 20, B-7000 Mons, Belgium, and School of Chemistry and Biochemistry and Center for Organic Photonics and Electronics, Georgia Institute of Technology, Atlanta, Georgia 30332-0400
| | - Claudio Zannoni
- Dipartimento di Chimica Fisica e Inorganica and INSTM, Università di Bologna, Viale Risorgimento 4, I-40136 Bologna, Italy, Laboratory for Chemistry of Novel Materials and Center for Research in Molecular Electronics and Photonics, University of Mons-Hainaut, Place du Parc 20, B-7000 Mons, Belgium, and School of Chemistry and Biochemistry and Center for Organic Photonics and Electronics, Georgia Institute of Technology, Atlanta, Georgia 30332-0400
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Sović T, Kappaun S, Koppitz A, Zojer E, Saf R, Bartl K, Fodor-Csorba K, Vajda A, Diele S, Pelzl G, Slugovc C, Stelzer F. Main-Chain Liquid Crystalline Polymers Based on Bis-Etherified 9,9-Dihexyl-2,7-bis(4′-hydroxy-1,1′-biphen-4-yl)fluorenes. MACROMOL CHEM PHYS 2007. [DOI: 10.1002/macp.200600657] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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