Crystal Structure, Spectroscopic and Thermal Investigations of a New 4‐Ammonio‐2,2,6,6‐tetramethylpiperidinium Tetrachlorozincate(II)

Abstract

The new complex of Zn(II) with 4-ammino-2,2,6,6-tetramethylpiperidine, [C9H22N2]ZnCl4, has been prepared and characterized by various physicochemical studies. This compound crystallizes in the monoclinic system, with the space group P21/c and the following cell parameters: a = 9.8682(7), b = 7.5164(5), c = 21.019(2) Å, β = 99.003 (7)°, V = 1539.8(2) Å3and Z = 4. The crystal structure was solved and refined to R = 0.024 using 3070 reflections. The atomic arrangement can be described by slightly distorted tetrahedral ZnCl42-anions and 4-ammmonio-2,2,6,6-tetramethylpiperidinium cations holding together by different interactions. The four chlorine atoms of the ZnCl42-tetrahedron are acting as acceptors of hydrogen bonds. The crystal packing is influenced by cation-to-anion N-H…Cl and C-H…Cl hydrogen bonds leading to open framework architecture.

4-Azaniumyl-2,2,6,6-tetramethylpiperidin-1-ium dinitrate

“…The piperidine ring adopts a chair conformation, with puckering parameters (calculated with PLATON (Spek, 2009)): Q = 0.535 Å, Θ = 6.63 ° and Φ = 205.565 ° (Cremer & Pople, 1975). This conformation has also been noticed in other 4azaniumyl-2,2,6,6-tetramethylpiperidin-1-ium salts (Chebbi & Driss, 2001;Huang & Deng, 2007;Mrad et al, 2009;El Glaoui et al, 2010).…”

“…The title compound, C 9 H 22 N 2 2+ •2NO 3 -, was synthesized unexpectedly from 4-amino-2,2,6,6-tetramethylpiperidine, bismuth(III) nitrate pentahydrate and nitric acid. We report in this paper it's structure; its homologues obtained with chlorate, phosphate and tetrachlorozincate anions has been described previously (Huang & Deng, 2007;Mrad et al, 2009;El Glaoui et al, 2010).…”