Melaminium benzoate dihydrate

A new melaminium salt, 2,4,6-tri­amino-1,3,5-triazin-1-ium benzoate dihydrate, C₃H₇N₆⁺·C₆H₅COO⁻·2H₂O, consists of singly protonated melaminium residues, benzoate anions and water mol­ecules. The components are linked by hydrogen bonds into a three-dimensional framework structure. The melaminium residues are connected by two pairs of N—H...N hydrogen bonds into chains. The benzoate anion acts as acceptor for two hydrogen bonds from melaminium residues and for three hydrogen bonds from the two water mol­ecules, which themselves form an O—H...O bonded dimeric structure. The extended structure is a double layer, with a distance of 3.38 (1) Å between the triazine rings, indicating π–π interactions.

Melaminium formate

Crystals of a new melaminium salt, 2,4,6-tri­amino-1,3,5-triazin-1-ium formate, C₃H₇N₆⁺·CHO₂⁻, consist of singly protonated melaminium residues and formate anions. The components are linked by hydrogen bonds into a three-dimensional framework structure. The melaminium residues are interconnected by two pairs of N—H...N hydrogen bonds into chains in the form of stacks, with a distance of 3.34 (1) Å between the triazine rings, clearly indicating π–π interactions. The chains of melaminium residues are interconnected via N—H...O hydrogen bonds by the formate anions, forming a non-covalent superstructure.

Bis{[phthalocyaninato(2–)]antimony(III)} tetradecaiodotetraantimonate(III)

The structure of the title compound, [Sb(C₃₂H₁₆N₈)]₂[Sb₄I₁₄] or [SbPc]₂[Sb₄I₁₄], where Pc is the phthalocyaninate(2−) macrocycle, is built up from separate but inter­acting [SbPc]⁺ cations and [Sb₄I₁₄]²⁻ anions. The Sb atom of the [SbPc]⁺ ion is bonded to four isoindole N atoms of the macrocycle and lies 0.974 (1) Å out of the plane defined by these four N atoms. The anion consists of [SbI₃] and [SbI₄]⁻ units which, through an inversion centre, form an [Sb₄I₁₄]²⁻ anion. The anions interact with each other, forming {[Sb₄I₁₄]²⁻}_n chains. The arrangement of oppositely charged ions, viz. [SbPc]⁺ and [Sb₄I₁₄]²⁻, in the crystal structure is determined mainly by the ionic attractions between the [SbPc]⁺ and [Sb₄I₁₄]²⁻ units and by π–π inter­actions between the aromatic macrocycles.

Piperazinium nitrate

Crystals of the title compound, C₄H₁₁N₂⁺·NO₃⁻, are built up from singly protonated piperazinium residues and nitrate anions. The components are linked by hydrogen bonds into a three-dimensional framework. The piperazinium residues are linked together via N—H...N hydrogen bonds into chains in the form of stacks along the [100] direction.