Mechanochemical Synthesis and Structure Analysis of Binary Cocrystals of Extended Bis-Pyridyl Spacers with Resorcinol and Orcinol

Binary cocrystals of 1,4-bis(4 ' -pyridyl)-2,3-diaza-1,3-butadiene (4,4 ' -bpdb, L-1) and 1,4-bis(3 ' -pyridyl)-2,3diaza-1,3-butadiene (3,3 ' -bpdb, L-2) in combination with two templates, resorcinol (T-1) and orcinol (T-2) were synthesized by mechanochemical dry grinding. Their structures were elucidated by single crystal Xray crystallography, powder X-ray diffraction (PXRD) and characterized by other spectroscopies, such as optical, nuclear magnetic resonance, and Fourier transform infra-red spectroscopy. Expected 2:2 cocrystals were obtained, except for the combination of L-2 and T-1 , crystals of 2L(2) :T-1 cocrystal was obtained via solution crystallization. Solid state photoluminescence of these cocrystals have been explored. (c) 2022 Elsevier B.V. All rights reserved.