Abstract
4,7-Bis-(4′-cyano-biphenyl-4-yl)-[1, 10]phenanthroline (cnbiphphen) is synthesized from a palladium mediated coupling between 4-cyanobenzene boronic acid and 4,7-bis(4-bromophenyl)-[1,10]phenanthroline. The single crystal X-ray structure was measured at both 298(2) K and 90(2) K. The asymmetric unit of the title compound in the low-temperature phase, C38H22N .4 HCCl3, is comprised of one cnbiphphen molecule and one chloroform solvent molecule. Additional symmetry relates one-half of the title compound to the other at room temperature. During cooling the structure experiences a reversible phase transition from A 2/a (different setting of C 2/c, with a and c exchanged to match lattice parameters of both phases) to P 21/c. The crystal packing of the title compound consists primarily of electronic charge interactions between the cyano moieties. The chloroform solvent mol-ecule is situated in a cavity between two phenanthroline systems and is associated to two nitrogen atoms of cnbiphphen molecules through Cl3C–H⋯Nphen van der Waals interaction.
Graphical Abstract
The synthesis, structure, analytical characterization, optical properties and phase transition of 4,7-bis-(4’-cyano-biphenyl-4-yl)-[1,10]phenanthroline is presented.
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Acknowledgments
The authors wish to thank Andranik Aprikyan and Kilian Dill of Stemgenics for the use of their spectrophotometer.
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Carlson, B., Kaminsky, W., Tong, L. et al. Structure and Phase Transition of 4,7-Bis-(4′-cyano-biphenyl-4-yl)-[1, 10]phenanthroline. J Chem Crystallogr 45, 453–460 (2015). https://doi.org/10.1007/s10870-015-0614-y
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DOI: https://doi.org/10.1007/s10870-015-0614-y