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The title molecular complex, [Zn(H2O)6](ClO4)2·2C6H8N2O2, consists of neutral 2,5-di­methyl­pyrazine 1,4-dioxide mol­ecules, a hexa­aqua­zinc(II) cation and perchlorate anions, linked through Coulombic attraction and hydrogen bonding. Half the neutral molecules lie in general positions, and the other half are on inversion centers.

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The title compound, [Ni(NCS)2(C6H7NO)2(H2O)2]·H2O, consists of a mononuclear complex and an uncoordinated water mol­ecule. The nickel(II) ion has a distorted octahedral coordination, formed by two N atoms from two thio­cyanate anions and four O atoms from two water mol­ecules and two 4-methyl­pyridine N-oxide mol­ecules. The uncoordinated water mol­ecules and the complex are connected by O—H...O and O—H...S hydrogen bonds.

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In the title mononuclear complex, [Co(NCS)2(C5H5NO)2(H2O)2], cobalt(II) has a distorted octahedral coordination formed by two N atoms from two thio­cyanate anions and four O atoms from two water mol­ecules and two pyridine N-oxide mol­ecules. The complexes are connected to each other by O—H...O and O—H...S hydrogen bonds.

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The title structure, (C5H7N2)2[Co(NCS)4], comprises discrete monovalent 4-amino­pyridinium cations and divalent tetra­thio­cyanatocobaltate(II) anions. The cations and anions are linked via N—H...S hydrogen bonds [N...S = 3.264 (4)–3.640 (6) Å] to form a three-dimensional framework.
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