Synthesis,Crystal Structure and Dielectric Property of Clathrate Based on 18-Crown-6 with Biprotonated 1,3-Propane-diamine

The reaction of 1,3-propane-diamine hydrochloride,18-crown-6 and trivalent ferric chloride in methanol solution yields an unusual supramolecular clathrate,18-crown-6 and 1,3-propane-diaminium(μ2-oxo)-hexachloro-di-iron(Ⅲ))clathrate,[(C3N2H12)·(18-Crown-6)2][Fe2OCl6](1).The biprotonated 1,3-propane-diaminium cation contains two-NH3+ ammonium cations,resulting in a sandwich-type [(C3N2H12)2+·(18-crown-6)2] supramolecular structure,through N-H…O hydrogen bonding interactions within the crystals between the ammonium moieties of cations(-NH3+)and the oxygen atoms of the crown ethers.Dielectric constants of compound 1 were measured at different temperatures and frequencies,showing there is no distinct dielectric anomaly occurred in this case and suggesting that there may be no phase transition within the measured temperature range.CCDC:772928.