Abstract
Four novel dyes containing alkynylcarbazole, namely, 2-((9H-carbazol-3-yl)ethynyl)-9-ethyl-9H-carbazole, 3,6-bis((9-ethyl-9H-carbazol-2-yl)ethynyl)-9H-carbazole, 3-(phenylethynyl)-9H-carbazole and 3,6-bis(phenylethynyl)-9H-carbazole, were synthesized on the basis of single and double substitutes by following the Sonogashira coupling method. The synthesized dyes were then assessed as novel photosensitizers in visible-light photopolymerization to evaluate the effects of conjugation on the properties of aromatic compounds. A comparison between UV–vis and TD/DFT electron transition spectra shows that \(\lambda _{\mathrm{max}}\) in theoretical ultraviolet spectra matched well with the experimental spectra; every conjugated alkynylcarbazole dye exhibits a wide absorption band in the range of 300–400 mm. Moreover, conjugation enhancement by switching carbazoleacetylene moieties caused a red shift in the absorption bands. The theoretical study showed that the maxima \(\lambda \) of these molecules ranged from \(\sim \)330 to 370 mm, corresponding to \(\pi {\rightarrow }\pi ^{*}\) and \({n}{\rightarrow }\pi ^{*}\) electron transitions. Fluorescence spectroscopic data show that the strongest emission peaks exhibit a red shift because of the addition of conjugated acetylene groups. A combination of alkynyl dyes and iodonium under a halogen lamp atmosphere by visible-light photopolymerization displayed a positive response to the cationic polymerization of bisphenol-A epoxy resin A and free-radical polymerization of tripropylene glycol diacrylate.
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References
Minezawa N 2015 Chem. Phys. Lett. 622 115
Sacarescu L, Fortuna M, Soroceanu M, Cojocaru C, Sacarescu G, Simionescu M et al 2015 Silicon 7 343
Crivello J V and Jiang F 2002 Chem. Mater. 14 4858
Crivello J V and Jang M 2005 J. Macromol. Sci. Part A Pure Appl. Chem. A 42 1
Xiao P, Lalevee J, Zhao J and Stenzel M H 2015 Macromol. Rapid. Commun. 36 1675
Zhang J, Campolo D, Dumur F, Xiao P, Gigmes D, Fouassier J P et al 2016 Polym. Bull. 73 493
Zhou T F, Ma X Y, Han W X, Guo X P, Gu R Q, Yu L J et al 2016 Polym. Chem. 7 5039
Wang M, Ma X, Yu J, Jia X, Han D, Zhou T et al 2015 Polym. Chem. 6 4424
Zahlou A, Sadiki Y, Bejjit L, Haddad M, Hamidi M and Bouachrine M 2014 J. Mater. Environ. Sci. 5 532
Sathiyan G, Sivakumar E K T, Ganesamoorthy R, Thangamuthu R and Sakthivel P 2016 Tetrahedron Lett. 57 243
Al Mousawi A, Garra P, Dumur F, Bui T T, Goubard F, Toufaily J et al 2017 Molecules 22 1
Al Mousawi A, Dumur F, Garra P, Toufaily J, Hamieh T, Graff B et al 2017 Macromolecules 50 2747
Zhang J, Campolo D, Dumur F, Xiao P, Gigmes D, Fouassier J P et al 2016 Polym. Bull. 73 493
Li G L, Liu J Q, Zhao B D and Wang T 2013 Spectrochim. Acta A Mol. Biomol. Spectrosc. 104 287
Bourass M, Touimi B A, Benzakour M, Mcharfi M, Jhilal F, Serein S F et al 2017 J. Saudi Chem. Soc. 21 563
Madkour L H, Kaya S, Kaya C and Guo L 2016 J. Taiwan Inst. Chem. Eng. 68 461
Stalindurai K, Gokula K K, Nagarajan E R and Ramalingan C 2017 J. Mol. Struct. 1130 633
Shao J, Huang Y and Fan Q 2014 Polym. Chem. 5 4195
Sipani V and Scranton A B 2004 Encycl. Polym. Sci. Technol. (New York: John Wiley & Sons, Inc.)
Tucker S H 1926 J. Chem. Soc. 129 546
Kumchoo T, Promarak V, Sudyoadsuk T, Sukwattanasinitt M and Rashatasakhon P 2010 Chem. – Asian J. 5 2162
Kato S I, Noguchi H, Kobayashi A, Yoshihara T, Tobita S and Nakamura Y 2012 J. Org. Chem. 77 9120
Chao P, Gu R, Ma X, Wang T and Zhao Y 2016 Polym. Chem. 7 5147
Stansbury J W and Dickens S H 2001 Dent. Mater. 17 71
Jiang B and Huang Y D 2008 Composites Part A 39 712
Abro H A, Zhou T, Han W, Xue T and Wang T 2017 RSC Adv. 7 55382
Acknowledgements
We acknowledge the National Key R&D Plan (project grant code: 2017YFB0307800) for providing them financial support. Additionally, they are very thankful to the Beijing University of Chemical Technology CHEMCLOUDCOMPUTING platform for providing support for computational work.
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Abro, H.A., Zhao, B., Han, W. et al. Effects of conjugation on the properties of alkynylcarbazole compounds: experimental and theoretical study. Bull Mater Sci 41, 153 (2018). https://doi.org/10.1007/s12034-018-1672-5
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DOI: https://doi.org/10.1007/s12034-018-1672-5