Two polymorphs of 4-(4-hexyloxyphenyl)-2,6-di(pyrazin-2-yl)pyridine and the crystal structure of its copper(II) complex

Add time:09/24/2019    Source:sciencedirect.com

4-(4-Hexyloxyphenyl)-2,6-di(pyrazin-2-yl)pyridine (1), an analogue of the archetypal ligand, 2,2′:6′,2″-terpyridine containing additional outer N-donating sets is synthesized through the facile one-step Kröhnke condensation reaction. It is observed that different crystallization conditions affect the molecular packing in 1 and as a result two crystal polymorphs are resolved via single-crystal X-ray diffraction analysis. Distinct intermolecular π…π interactions were found to play a crucial role in driving the formation of polymorphism. The complexation of this ligand with copper(II) dichloride resulted in the formation of a mononuclear complex with CuII being in the chelating cavity of 1. X-ray structural analysis confirms that this is the only product even though the synthesis was conducted under various conditions, remarkably different from the known structure with three CuII cores.

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