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The title compound, {(C6H8N)[AgWSe4]·C6H7N}n, consists of anionic [WAgSe4]n chains, 2-methyl­pyridinium cations and neutral 2-methyl­pyridine mol­ecules. The Se atoms bridge the Ag and W atoms, forming a polymeric chain extending along the b-axis direction. Both the Ag and W atoms are located on a twofold rotation axis and each metal atom is coordinated by four Se atoms in distorted tetra­hedral geometry. In the crystal, the 2-methyl­pyridinium cation and 2-methyl­pyridine mol­ecule are linked via N—H...N hydrogen bonding. Weak C—H...Se inter­actions link the organic components and polymeric anions into a three-dimensional architecture.

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The title compound, C4H6ClNO3, crystallizes with two independent mol­ecules (A and B) in the asymmetric unit. In each mol­ecule, there are N—H...O and N—H...Cl hydrogen bonds. Both mol­ecules are relatively planar, with the mean plane of the acetamide [N—C(=O)C] group being inclined to the mean plane of the acetate group [C—C(=O)O] by 9.23 (13)° in mol­ecule A and 6.23 (12)° in mol­ecule B. In the crystal, adjacent mol­ecules are linked by O—H...O hydrogen bonds and weak C—H...O contacts forming –AAA– and –BBB– parallel chains propagating along the a-axis direction.
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