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Crystal Structure and Phase Transitions in N-benzyl Piperidinium Dihydrogenmonophosphate, C6H5CH2CHCH2CH2NH2CH2CH2·H2PO4

✍ Scribed by Z. Elaoud; S. Kamoun; T. Mhiri; F. Romain; H. Burzlaff

Publisher: Elsevier Science
Year: 2000
Tongue: English
Weight: 288 KB
Volume: 155
Category: Article
ISSN: 0022-4596
DOI: 10.1006/jssc.2000.8899

No coin nor oath required. For personal study only.

✦ Synopsis

The salt N-benzyl piperidinium dihydrogenmonophosphate (N-BPP) is orthorhombic P2 1 2 1 2 1 with the following unit cell dimensions: a ‫؍‬ 6.044(1) A > , b ‫؍‬ 9.038(1) A > , c ‫؍‬ 25.126(3) A > , D m ‫؍‬ 1.302 Mg m ؊3 , D x ‫؍‬ 1.322 Mg m ؊3 , ‫؍‬ 0.21 mm ؊1 , F(000) ‫؍‬ 584; T ‫؍‬ 298 K; R ‫؍‬ 0.045, and R w ‫؍‬ 0.138 for 1721 independent re6ections. The structure consists of in5nite parallel two-dimensional planes built of mutually H 2 PO ؊ 4 anions and

cations connected by strong O}H2O and N}H2O hydrogen bonding. There are no contacts other than normal van der Waals interactions between the layers. Di4erential scanning calorimetry study on N-BPP was carried out. A low-temperature phase transition at 269 K to an ordered phase was found. Measurements by the electric permittivity revealed a second-order phase transition at 269 K. The Raman and infrared of polycrystalline samples of N-BPP have been recorded at di4erent temperatures between 170 and 435 K.

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