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AfCA collection

Celebrating work published by African researchers in IUCr journals

Edited by Susan Bourne, Delia Haynes and Michele Zema

To commemorate the founding of the African Crystallographic Association and also to mark the 75th anniversary of the IUCr, we are publishing a special collection of articles from African researchers, which will provide a valuable and visible endorsement of the development of crystallography in Africa.

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research articles

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The title benzimidazole com­pounds were synthesized by the condensation reaction of benzene-1,2-di­amine with 4-meth­oxy­naph­tha­lene-1-carbaldehyde in the ratios 1:1 and 1:2, respectively. Both com­pounds exhibit significant anti­corrosion properties with respect to iron and copper.

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The title Schiff base was synthesized by the reaction of 2-amino-4-methyl­phenol with 4-meth­oxy­naph­tha­lene-1-carbaldehyde in a 1:1 ratio. The com­pound exhibits significant anti­corrosion properties for iron and copper.

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The hydrazone form is the predominant form in the solid state. The naphthol and benzene fragments attached to the –N=N– moiety adopt the s-trans conformation. There are only two types of inter­molecular inter­actions in the crystal structure: strong hydrogen-bonding C—H⋯O inter­actions and π–π stacking inter­actions.

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N-(5-Acetyl-4-methyl­pyrimidin-2-yl)benzene­sulfonamide was synthesized and structurally characterized. In the crystal, π–π inter­actions between the phenyl and pyrimidine groups of neighbouring mol­ecules form mol­ecular chains parallel to [010]. Adjacent chains are linked by N—H⋯N hydrogen-bonding inter­actions, resulting in a three-dimensional network.

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The synthesis and single-crystal X-ray structure of a substituted quinoxaline compound is described.
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