Abstract
The X-ray structure of a series of 1,4-diethynylbenzene bridged pyridyl polyfluoroiodo- and polyfluorobromophenyls designed to form self-complementary dimers in the solid state are reported. The compound 2-[[4-[(3-bromotetrafluorophenyl)ethynyl]phenyl]ethynyl]pyridine, 1, crystalized in the triclinic space group P-1 with unit cell parameters a = 6.3332(4) (Å), b = 7.4288(4) (Å), c = 17.8897(10) (Å) and α = 91.0980(10)°, β = 90.8580(10)° and γ = 94.3830(10)°. The asymmetric unit contains a unique molecule as a self-complementary halogen bonded dimer. Compounds 2, 3-[[4-[(2-bromotetrafluorophenyl)ethynyl]phenyl]ethynyl]pyridine and 3, 3-[[4-[(2-iodotetrafluorophenyl)ethynyl]phenyl]ethynyl]pyridine both crystalized in the triclinic space group P-1 and are isostructural with unit cell parameters a = 6.1324(13) (Å), b = 11.264(2) (Å), c = 13.064(3) (Å), α = 66.646(3)°, β = 89.736(3)°, γ = 87.726(3)° for 2 and a = 6.1671(5) (Å), b = 11. 2571(9) (Å), c = 13.3083(11) (Å), α = 66.2870(10)°, β = 88.1990(10)°, γ = 87.3820(10)° for 3. In both structures the molecules assemble as essentially planar self-complementary halogen bonded dimers. In contrast 3-[[4-[(2-bromo-4,5-difluorophenyl)ethynyl]phenyl]ethynyl]pyridine, 4, crystalized in the monoclinic space group P21/c with unit cell parameters a = 18.7881(7) (Å), b = 3.83820(10) (Å), c = 22.9321(9) (Å), α = γ = 90°, β = 102.6180(10)° and featured a C–H···N hydrogen bonded dimer.
Graphical Abstract
The formation of self-complementary halogen bonded dimers with a series of 1,4-diethynylbenzene bridged pyridyl polyfluoroiodo- and polyfluorobromophenyls is reported.
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Acknowledgments
We thank the National Science Foundation for financial support of this research (RUI Grant No. 1306284) and the Missouri State University Provost Incentive Fund that funded the purchase of the X-ray diffractometer.
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Kirchner, L.M., Bowling, N.P. & Bosch, E. Extended Self-complementary Halogen Bonded Dimers. J Chem Crystallogr 45, 466–475 (2015). https://doi.org/10.1007/s10870-015-0616-9
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DOI: https://doi.org/10.1007/s10870-015-0616-9