Abstract
The new organic–inorganic compound tetrapropylammonium tetrabromozincate [N(C3H7)4]2ZnBr4 has been synthesized and characterized by single-crystal X-ray diffraction, differential scanning calorimetry, IR, Raman and impedance measurements. The crystal structure refinement shows that the [N(C3H7)4]2ZnBr4 compound is crystallized in the monoclinic system (space group C2/c) with the following unit cell parameters: a = 33.145(5) A, b = 14.234(3) A, c = 15.081(2) A, β = 110.207(5)° and Z = 8. The structural arrangement of the title compound can be described as an alternation of organic and inorganic layers along the [100] direction. Differential scanning calorimetry disclosed two order–disorder transition phases located at 340 and 393 K. Besides, an analysis of the dielectric constants e′ and e″, at several frequencies, shows a distribution of relaxation times. This relaxation is probably due to the reorientational dynamics of alkyl chains.
Highlights
Attention has been drawn to a novel class of open-framework materials, namely organic–inorganic hybrid materials
The present work is devoted to the synthesis of X-ray characterization and dielectric properties of tetrapropylammonium tetrabromozincate, [N(C3H7)4]2[ZnBr4]
The compound crystallizes at room temperature in the monoclinic system
Summary
Attention has been drawn to a novel class of open-framework materials, namely organic–inorganic hybrid materials These materials exhibit specific properties, such as electronic, optical, thermal and catalytic, since they combine both inorganic and organic properties [1, 2]. Considerable interest has been devoted to the compounds of the general formula AMX4, where A is an organic cation, M a divalent metal (M: Zn, Cd, Cu, Mn...) and X a halogens (X: Cl, Br, and I) can be described as a sequence of alternating organic–inorganic layers. Many of these compounds exhibit successive structural phase transitions, which are associated with the reorientational dynamics of organic and inorganic part. The present work is devoted to the synthesis, crystal structure, IR, Raman, scanning calorimetry (DSC) and dielectric proprieties on a new tetrapropylammonium tetrabromozincate [N(C3H7)4]2[ZnBr4] sample
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