Bis(6-thioxo-1,6-dihydropurinium) tetrachlorozincate(II)

Abstract

The title salt, (C(5)H(5)N(4)S)(2)[ZnCl(4)], consists of two 6-thioxo-1,6-dihydropurinium (6mpH(2)(+)) cations (A and B) and a tetrachlorozincate anion, which are held together by N-H...Cl and C-H...Cl interactions. There is an anion-pi interaction between one Cl atom of the [ZnCl(4)](-) anion and the pyrimidine ring of the 6mpH(2)(+)(B) cation. Intermolecular pi-pi stacking interactions allow 6mpH(2)(+)(A) cations to form antiparallel pairs. One interesting structural feature is the double N-H...N intermolecular hydrogen bonds between two 6mpH(2)(+)(A) cations. This kind of interaction, mimicking that of natural nucleobases, can be very valuable in designing new therapeutic purine derivatives.

Propane-1,3-diaminium tetrachloridozincate(II) 18-crown-6 clathrate

“…The supramolecular [C 3 H 12 N 2 (18-crown-6)] 2+ cation is paired in this structure with the relatively compact [ZnCl 4 ] 2À anion. The Zn II ion adopts a modestly flattened tetrahedral coordination by four Cl À ions which has been seen in many crystal structures (Jin et al, 2005;Valkonen et al, 2006). The [ZnCl 4 ] 2À anion possesses typical Zn-Cl bond lengths [2.2323 (9)-2.3267 (9) Å ], while the Cl-Zn-Cl angles [99.00 (4)-117.67 (3) ] indicate some distortion from a regular tetrahedron.…”

4-(3-Ammoniopropyl)morpholin-4-ium tetrachloridozincate(II)

“…1, to ensure charge balance, the organic species is double protonated at N1 and N2 nitrogen atoms. These layers, situated at y = 1 / 4 and y = 3 / 4 , are themselves interconnected by a set of N2-H•••Cl hydrogen bonds (Table 1), alternating with layers, to form a three dimensional infinite network ( However, it is worth noticing that the Zn-Cl bond lengths and Cl-Zn-Cl bond angles in the [ZnCl 4 ] 2anion are not equal to one another but vary with the environment around the Cl atoms (Valkonen et al, 2006). In the title compound, the Zn-Cl bond lengths vary between 2.2486 (4) and 2.2950 (4) Å.…”

Bis(adamantan-1-aminium) tetrachloridozincate(II) 18-crown-6 monohydrate clathrate

“…The [ZnCl 4 ] 2À anions are present as counter-ions to the supramolecular [(C 10 H 18 N)(18-crown-6)] + and isolated adamantan-1-aminium cations, and hydrogen bond to both. The Zn II centre adopts a tetrahedral coordination with four Cl À ions, which has been observed in many crystal structures (Jin et al, 2005;Valkonen et al, 2006). Generally, the Zn-Cl bond lengths and the Cl-Zn-Cl angles in a [ZnCl 4 ] 2À anion are not equal (Wickleder, 2001;Albrecht et al, 2003) but vary with the environment around the Cl atoms.…”