Our main research projects at the Cégep de Sherbrooke aim to study the similarities and differences between HB and XB in order to better use them for the design of new materials. By comparing crystals with relatively similar crystalline parameters and molecular stacking (so-called isomorphous crystals), HB and XB interactions can be compared more efficiently.
The ultimate goal is to have a better understanding and control of these interactions to allow us to generate crystals with unique and flexible properties.
We are the first research group to report a series of four (4) isomorphous crystals of diacetylenes similarly involved in an HB (with H) or in a XB (with X = Cl, Br, I).
Baillargeon, P.; Rahem, T.; Caron-Duval, E.; Tremblay, J.; Fortin, C.; Blais, E.; Fan, V.; Fortin, D. & Dory, Y. L. Isomorphous crystal structures of chlorodiacetylene and iododiacetylene derivatives: simultaneous hydrogen and halogen bonds on carbonyl. Acta Cryst. 2017, E73, 1175-1179.
The next part of our work is now to use this methodology to compare the properties of the isomorphous crystals with each other.