Add time:08/31/2019         Source:sciencedirect.com

We herein report two hydrochloride crystals obtained by slow diffusion of acetone into methanol solution of 2-(imidazo[1,2-a]pyridin-2-yl)-2-oxoacetic acid radical which was acidified with different concentration of hydrochloric acid. The relationship between magnetic properties and crystal-stacking structures was also investigated. 2-(Imidazo[1,2-a]pyridin-2-yl)-2-oxoacetic acid radical in two crystals mainly exists as diamagnetic dimers formed by intermolecular close contacts or supramolecular interactions, giving rise to low magnetic susceptibilities. One crystal exhibits quasi-one-dimensional columnar stacking chain and weak antiferromagnetic behavior. Another one consists of dimers assembled by supramolecular interactions (hydrogen bonds and anion–π interactions), and reveals unusual magnetic behavior.

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