Assembly of a novel luminescent coordination polymer from europium nitrate and a new semirigid bridging podand

Bis(2-{2-[2-(benzyl-carbamo-yl)phen-oxy]acetamido}-eth-yl)ammonium nitrate ethanol disolvate

In the title compound, C₃₆H₄₀N₅O₆⁺·NO₃⁻·2C₂H₅OH, the nitrate anion is disordered over the two orientations of equal occupancy while the solvent mol­ecule reveals large displacement parameters. The cation is formed by protonation of the N atom of a secondary amine in the middle of the flexible chain and the whole compound has crystallographically imposed C-2 symmetry with the crystallographic b axis. An O atom of the nitrate anion links the acidic H atoms of the cation via N—H⋯O hydrogen bonding. In addition, neighbouring cations are connected by inter­molecular N—H⋯O hydrogen bonds and π–π inter­actions between the benzamide groups of the cations [centroid–centroid distance = 4.000 (3) Å], forming a chain along [001]. The ethanol solvent mol­ecules are arranged on the side of the chain through O—H⋯O hydrogen bonds.