Quinolinium dichromate, [C₉H₇NH⁺]₂·Cr₂O₇²⁻

Abstract

Key indicatorsSingle-crystal X-ray study T = 293 K Mean '(C±C) = 0.008 A Ê R factor = 0.056 wR factor = 0.162 Data-to-parameter ratio = 12.5For details of how these key indicators were automatically derived from the article, seeThe title compound, (C 9 H 8 N) 2 [Cr 2 O 7 ], crystallizes in the monoclinic space group P2 1 /c, with eight cations and four anions in the unit cell. The quinolinium cations and a dichromate anion are connected through NÐHÁ Á ÁO and CÐHÁ Á ÁO intermolecular hydrogen bonds and by aromatic %± %-stacking interactions. The dichromate geometry is normal, with a CrÐO(bridging)ÐCr angle of 135.1 (2) .

Correlation between structural studies and third order NLO properties of selected new quinolinium semi-organic compounds

“…The organic rings atoms are almost coplanar and the angle between the mean plane of the pyridinium and the benzene rings (i.e. the dihedral angle) is 1.15(2)°and this puckering along the C4-C9 bond is commonly found in quinolinium salts structures [36,37]. The presence of such puckering has already been noticed in compounds containing similar pyridinium rings [38].…”

[(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…”

Synthesis and structural characterization oftris(ethylenediamine)nickel(II) dichromate

“…The acentric nature of the CrO 4 tetrahedron has been exploited by the Poeppelmeier group to create new non-centrosymmetric materials [3][4][5]. The flexibility of CrO 4 to exist in several different structural environments can be evidenced by the structural characterization of dichromates and chromates with a variety of counter cations, which include pure inorganic cations , organic ammonium cations [27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45], and hybrid organicinorganic complex cations [3][4][5][46][47][48][49]. In the present study, we have investigated the reactions of potassium dichromate and potassium chromate with tris(ethylenediamine)nickel(II) dichloride dihydrate and characterized two new Cr(VI) compounds.…”