Thermal and Structural Investigations of the Bis-Dihexadecyldimethylammonium Dichromate

[(CH3)2NH(CH2)2NH(CH3)2]Cr2O7·H2O, un nouveau dichromate organique

“…La cristallochimie de chromates et de dichromates organiques a pris un essor considé rable ces derniè res anné es. A notre connaissance, 23 composé s ont é té structuralement caracté risé s jusqu'ici (Cygler et al, 1976;Sorehkin et al, 1978;de Bauer et al, 1991;Chebbi et al, 2000Chebbi et al, , 2003Chebbi & Driss, 2001, 2002aSrinivasan et al, 2003Srinivasan et al, , 2004Pecaut & Masse, 1993;Jannin et al, 1993;Lorenzo-Luis et al, 1995;Fossé & Brohan, 1999;Fossé et al, 1998Fossé et al, , 2001Sundar et al, 2003;Pressprich et al, 1990;Jin et al, 2004;Ben Smaïl et al, 2006;Khadhrani et al, 2006).…”

“…Codes de symé trie: Collection des donné es: CAD-4 EXPRESS (Duisenberg, 1992;Macíček & Yordanov, 1992); affinement des paramè tres de la maille: CAD-4 EXPRESS; ré duction des donné es: XCAD4 (Harms & Wocadlo, 1995); programme(s) pour la solution de la structure: SHELXS97 (Sheldrick, 1997); programme(s) pour l'affinement de la structure: SHELXL97 (Sheldrick, 1997); graphisme molé culaire: DIAMOND (Brandenburg, 1998); logiciel utilisé pour pré parer le maté riel pour publication: SHELXL97. (Cygler et al, 1976;Sorehkin et al, 1978;de Bauer et al, 1991;Chebbi et al, 2000Chebbi et al, , 2003Chebbi & Driss, 2001, 2002aSrinivansan et al, 2003Srinivansan et al, , 2004Pecaut et Masse, 1993;Janin et al, 1993;Lorenzo-Luis et al, 1995;Fossé et Brohan, 1999;Fossé et al, 1998Fossé et al, , 2001Sundar et al, 2003;Pressprich et al, 1990;Jannin et al, 1993;Jin et al, 2004;Ben Smaïl et al, 2006;Khadrani et al, 2005 (Brown, 1976;Blessing, 1986…”

Inorganic–Organic Hybrid Surfactant Crystals: Structural Aspects and Functions

“…Single-headed surfactants contain alkyltrimethylammonium ([CnH2n+1N(CH3)3] + (CnNC3), Figure 6a) [113,115,116,119,125,126,130,131] Figure 6b) [114,117], or alkylammonium derived from primary amine ([CnH2n+1NH3] + (CnNH3), Figure 6c) [123]. In addition, heterocyclic surfactants such as pyridinium ([C5H5N(CnH2n+1)] + (Cnpy), Figure 6e) [118,[120][121][122][127][128][129], pyridazinium ([C4H4N2(CnH2n+1)] + (Cnpda), Figure 6f) [128], and methylimidazolium ([(CnH2n+1)C3H3N2(CH3)] + (Cnmim), Figure 6g) [123,124] are employed.…”

Reversible Phase Transitions and Dielectric Properties in [(CH3)4P]2[Cr2O7] and ­[Et4P]2[Cr3O10]

“…As depicted in Figure 2a, the asymmetric unit of the HTP contains one third of each [(CH 3 ) 4 anion exhibits a staggered conformation rather than an exactly eclipsed one, that is, viewed along the Cr-Cr direction, the two [CrO 4 ] tetrahedrons are twisted by about 60.0°, as illustrated in Figure 3 (a). [64,65] Table 1). Symmetry breaking occurs with an Aizu notation of m-3Fmmm.…”