In order to improve the yield of hexakis(4-dodecy)-peri-hexabenzocoronene
a new synthetic approach is designed. First
hexa(4-iodophenyl)benzene is synthesized by cyclotrimerization of diphenylacetylene and then iodosubstitued. A palladium catalyzed Kumada cross-coupling reaction of 1-Bromododecane with that intermedium and cyclodehydrogenation are utilized in the last two reaction steps. The chemical structure of the target compound is characterized by
1
H NMR and elemental ana-lysis
and the optical
thermal and electrochemical properties of this HBC material are studied. The yield is improved to 40.9%
which showed 13% higher than that of the general method. This novel synthetic routine has advantages of simpler purification
fewer reaction steps and lower costing over that reported in the article before.
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references
陈树森,李田,赵达慧.盘状液晶材料的研究进展[J]. 物理化学学报,2010,26(4): 1124-1134. Chen S S, Li T, Zhao D H. Progress in discotic liquid crystalline materials [J]. Acta Physico Chimica Sinica, 2010, 26(4): 1124-1134. (in Chinese)[2] Kumar S. Self-organization of disc-like molecules: chemical aspects [J]. Chem. Soc. Rev., 2006, 35 (1): 83-86.[3] Bisoyi H K, Kumar S. Discotic nematic liquid crystals: science and technology [J]. Chem. Soc. Rev. , 2010, 39 (1): 264-285.[4] 崔晓鹏, 王磊, 黄琪, 等. 基于异烟酸酯类衍生物的超分子盘状液晶构建[J]. 液晶与显示,2011,26(6): 727-732. Cui X P, Wang L, Huang Q, et al. Supramolecular discotic liquid crystals formed by hydrogen bonding of isonicotinic acid derivatives [J]. Chinese Journal of Liquid Crystals and Displays, 2011, 26(6): 727-732. (in Chinese)[5] Lukas F D, Valentin K, Ian A H, et al.Synthesis and controlled self-assembly of covalently linked Hexa-peri-hexabenzocoronene/Perylene Diimide dyads as models to study fundamental energy and electron transfer processes [J]. J. Am. Chem. Soc., 2012, 134:5876-5886.[6] O'Neill M, Kelly S M. Liquid crystals for charge transport, luminescence, and photonics [J]. Adv. Mater., 2003, 15: 1135-1146.[7] van de Craats A M, Warman J M, Fechtenkotter A, et al. Record charge carrier mobility in a room-temperature discotic liquid-crystalline derivative of hexabenzocoronene [J].Adv. Mater., 1999, 11: 1469-1472.[8] Liu C Y, Fechtenktter A, Mark D W, et al. Room temperature discotic liquid crystalline thin films of hexa-peri-hexabenzocoronene: synthesis and optoelectronic properties [J].Chem. Mater., 2003, 15: 124-130.[9] Ana V, Donocadh P L, Paul J L, et al. Characterization and conductivity of langmuirblodgett films prepared from an amine-substituted oligo(phenylene ethynylene) [J]. Chem. Mater., 2008, 20: 258-264.[10] Hyatt J A. Organic preparations and procedures international: the new journal for organic synthesis [J]. Org. Prep. Proced. Int. , 1991, 23: 460-463.[11] Kbel C, Eckhardt K, Enkelmann V, et al. Synthesis and crystal packing of large polycyclic aromatic hydrocarbons: hexabenzo coronene and dibenzo phenanthro pentaphene [J]. J. Mater. Chem. , 2000, 10: 879-886.[12] Stabel A, Herwig P. Diodelike current-voltage curves for a single molecule-tunneling spectroscopy with submolecular resolution of an alkylated, peri-condensed hexabenzocoronene [J].Angew. Chem. Int. Ed. Engl., 1995, 34: 1609-1611.[13] Herwig P, Kayser W. Columnar mesophases of alkylated hexa-peri-hexabenzocoronenes with remarkably large phase widths [J]. Adv. Mater., 1996, 8: 510-513.[14] Kastler M, Pisula W, Wasserfallen D, et al. Influence of alkyl substituents on the solution- and surface-organization of hexa-peri-hexabenzocoronenes [J].J. Am. Chem. Soc., 2005, 127: 4286-4296.[15] Pisula W, Kastler M, Wasserfallen D, et al. Exceptionally long-range self-assembly of hexa-peri-hexabenzocoronene with dove-tailed alkyl substituents [J].J. Am. Chem. Soc., 2004, 126: 8074-8075.[16] Fechtenktter A, Saalwchter K, Harbison M A, et al. Highly ordered columnar structures from hexa-peri-hexabenzocoronenes-synthesis, X-ray diffraction, and solid-state heteronuclear multiple-quantum nmr investigations [J].Angew. Chem. Int. Ed., 1999, 38, 3039-3042.[17] Jishan W, Wojciech P, Klaus M.Graphenes as potential material for electronics [J]. Chem. Rev., 2007, 107(3): 718-747.[18] Piris J, Debije M G, Stutzmann N, et al. Aligned thin films of discotic hexabenzocoronenes: anisotropy in the optical and charge transport properties [J]. Adv. Funct. Mater., 2004, 74: 1053-1061.