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organic compounds
In bis(2-carboxypyridinium) hexafluorosilicate, 2C6H6NO2+·SiF62−, (I), and bis(2-carboxyquinolinium) hexafluorosilicate dihydrate, 2C10H8NO2+·SiF62−·2H2O, (II), the Si atoms of the anions reside on crystallographic centres of inversion. Primary inter-ion interactions in (I) occur via strong N—H
F and O—HF hydrogen bonds, generating corrugated layers incorporating [SiF6]2− anions as four-connected net nodes and organic cations as simple links in between. In (II), a set of strong N—HF, O—HO and O—HF hydrogen bonds, involving water molecules, gives a three-dimensional heterocoordinated rutile-like framework that integrates [SiF6]2− anions as six-connected and water molecules as three-connected nodes. The carboxyl groups of the cation are hydrogen bonded to the water molecule [OO = 2.5533 (13) Å], while the N—H group supports direct bonding to the anion [NF = 2.7061 (12) Å].
F and O—HF hydrogen bonds, generating corrugated layers incorporating [SiF6]2− anions as four-connected net nodes and organic cations as simple links in between. In (II), a set of strong N—HF, O—HO and O—HF hydrogen bonds, involving water molecules, gives a three-dimensional heterocoordinated rutile-like framework that integrates [SiF6]2− anions as six-connected and water molecules as three-connected nodes. The carboxyl groups of the cation are hydrogen bonded to the water molecule [OO = 2.5533 (13) Å], while the N—H group supports direct bonding to the anion [NF = 2.7061 (12) Å].
