Crystal structure and dielectric property of supramolecular macrocyclic [(NDPA)•(18-crown-6)]2+•(DMA)+•3ClO4- assemblies

One novel organic-inorganic hybrid supramolecular assemblies [(NDPA)center dot(18-crown-6)](2+)center dot(DMA)(+)center dot 3ClO(4)(-) (1), has been successfully constructed through the prominent strategies of crystal engineering (NDPA = N,N-dimethyl-1,4-phenylenediamine, DMA = dimethylamine), and characterized by IR, powder XRD and single crystal X-ray diffraction. In the structure, the supramolecular organic cations and inorganic ClO4- anions are arranged alternately and linked by N-O center dot center dot center dot H hydrogen bonds. It is worthy to note that the ClO4- are linked to form one-dimensional inorganic chain through strong N-H center dot center dot center dot O hydrogen bonds along b-axis. There is no distinct dielectric anomaly in the temperature-dependent and frequency-dependent dielectric constant curves, suggesting that no phase transition exists within the measured temperature range (120-420 K). The relative displacement of cations and anions, the turned polarization of molecular electric moment and macrocyclic molecule rotator are the main factors to determine the trend of dielectric constant. (C) 2014 Da-Wei Fu. Published by Elsevier B.V. on behalf of Chinese Chemical Society and Institute of Materia Medica, Chinese Academy of Medical Sciences. All rights reserved.