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A 1:2 co-crystal of isonicotin­amide and propionic acid

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Isonicotin­amide has been shown to form many 1:1 co-crystals with monofunctional carboxyl­ic acids, but with propionic acid it forms a co-crystal containing two acid mol­ecules and one isonicotin­amide mol­ecule per formula unit, C6H6N2O·2C3H6O2. The crystal structure consists of `supermol­ecules' made up of of one isonicotin­amide mol­ecule and two acid mol­ecules, and the asymmetric unit contains two of these supermolecules. One of the acid mol­ecules is hydrogen bonded to the pyridine function, and the other to the amide function of the isonicotin­amide. Further N—H…O hydrogen bonds connect these supermol­ecules into chains which run along the [100] direction. The chains are linked into layers perpendicular to (010) by C—H…O and -stacking interactions. The layers are then linked together by further C—H…O interactions.
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Document Type: Research Article

Publication date: December 1, 2004

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