Poly[[μ-N,N′-bis­(2-hy­droxy­eth­yl)-N,N,N′,N′-tetra­methyl­propane-1,3-diaminium-κ²O:O′]tetra-μ-bromido-dibromidodimanganese(II)]

The asymmetric unit of the title three-dimensional coordination polymer, [Mn₂Br₆(C₁₁H₂₈N₂O₂)]_n, consists of one Mn^II cation, half of a dicationic N,N′-bis­(2-hy­droxy­eth­yl)-N,N,N′,N′-tetra­methyl­propane-1,3-diaminium ligand (L) (the other half being generated by a twofold rotation axis), and three bromide ions. The Mn^II cation is coordinated by a single L ligand via the hy­droxy O atom and by five bromide ions, resulting in a distorted octa­hedral MnBr₅O coordination geometry. Four of the bromide ions are bridging to two adjacent Mn^II atoms, thereby forming polymeric chains along the a and b axes. The L units act as links between neighbouring Mn—(μ-Br)₂—Mn chains, also forming a polymeric continuum along the c axis, which completes the formation of a three-dimensional network. Classical O—H...Br hydrogen bonds are present. The distance between adjacent Mn^II atoms is 4.022 (1) Å.

1-{2-[4-(4-Nitro­phen­yl)piperazin-1-yl]eth­yl}-4-aza-1-azoniabicyclo­[2.2.2]octane iodide

The title compound, C₁₈H₂₈N₅O₂⁺·I⁻, was observed as a main product in an intended 1:1 reaction between 4-iodo­nitro­benzene and 1,4-diaza­bicyclo­[2.2.2]octane (DABCO). In the reaction, DABCO undergoes a ring opening to yield a quaternary salt of DABCO and 1-ethyl-4-(4-nitro­phen­yl)piperazine with an iodide anion. The crystal structure determination was carried out as no crystal structure had been previously reported in the investigations describing the corresponding reaction with 4-chloro­nitro­benze. Indeed, the crystal structure of the title compound confirms the mol­ecular composition proposed earlier for the analogous chloride salt. The cation conformation is similar to the previously reported dinitro analogue 1-{2-[4-(2,4-dinitro­phen­yl)piperazin-1-yl]eth­yl}-4-aza-1-azoniabicyclo­[2.2.2]octane chloride [Clegg et al. (2004). Acta Cryst. E60, o291–o293]. The crystal packing is dominated by cation...I⁻ inter­actions in addition to weak inter­molecular C—H...O₂N and C—H...N inter­actions between the cations.