Second-order phase transition of 1,4-butanediyldiammonium manganese tetrachloride. A neutron diffraction study on clustered crystals

1,4-Butanediammonium tetrachloromercurate(II)

“…The end C atoms of the C 4 chain are trans around the central CÐC bond, so the 4DA chains are gtg (gauche, trans, gauche) (Halvorson & Willett, 1988), with terminal CÐCÐCÐN torsion angles of 73.1 (13) . This particular con®guration contrasts with the all-trans conformation found in the manganese homologous 4DA± MnCl 4 (Tichy  et al, 1980). The structure is closely related to the analogous copper halide compounds Garland et al, 1990) and to a palladium halide compound previously reported by Zouari et al (1998); (i) the layer of the corner-connected octahedra contains nearly equivalent distances in the plane and a shorter distance perpendicular to it, which is similar to the CuBr 4 compound; (ii) in contrast to the CdCl 4 compound, there are two contacts of the diammonium cation to bridging halide and only one to the terminal halide, which is a similar situation to the CuCl 4 compounds; (iii) the arrangement of cation chains is equivalent to the situation in 4DA±PbBr 4 (Zouari et al, 1998) and could alternatively be described as a gauche±gauche orientation; (iv) the similarities in the lattice parameters of all related compounds (4DA±PdBr 4 , 4DA±CuBr 4 and 4DA±CuCl 4 ) can be seen.…”

Two-Dimensional Hybrid Halide Perovskites: Principles and Promises

“…Reported organic cations that form corner-sharing (100)-oriented, (110)-oriented, or (111)-oriented 2D halide perovskite structures ( n = layer thickness number): 1 , primary alkyl­ammonium ( m = 0–1, n = 1; m = 1, n = 3; , m = 2, n = 1; − m = 3, n = 1–5; ,,, m = 4–5, n = 1; m = 6–9, n = 1; m = 9–10, n = 1; m = 11, 13, 15, 17, n = 1 , ); 2 , primary alkyl­diammonium ( m = 3, n = 1; m = 4, n = 1; ,− m = 4–9, n = 1–4; m = 5–6, n = 1; ,, m = 8, 10, 12, n = 1 , ); 3 , m = 2, N 1 -methyl­ethane-1,2-diammonium (N-MEDA); m = 3, N 1 -methyl­propane-1,3-diammonium (N-MPDA); all n = 1); 4 , m = 2, 2-(dimethyl­amino)­ethyl­ammonium (DMEN); m = 3, 3-(dimethyl­amino)-1-propyl­ammonium (DMAPA); m = 4, 4-(dimethyl­amino)­butyl­ammonium (DMABA); all n = 1); 5 , ammonium 4-butyric acid ( n = 2); 6, iodo­form­amid­inium ( n = 1–3); 7 , guanidinium (GA, n = 1–3 ,, ); 8 , protonated thiourea cation ( n = 1); 9 , 2,2′-dithio­diethan­ammonium ( n = 1 , ); 10 , 2,2′-(ethylene­dioxy)­bis­(ethyl­ammonium) (EDBE, n = 1); 11 , protonated 2-(amino­ethyl)­iso­thio­urea ( n = 1); 12 , but-3-yn-1-ammonium (BYA, n = 1); 13 , 2-fluoro­ethyl­ammonium ( n = 1); 14 , 2-methyl­pentane-1,5-diammonium ( n = 1); 15 , isobutyl­ammonium (IBA, n = 1); 16 , heteroatom-substituted alkyl­ammonium ( n = 1); 17 – 20 , cyclo­propyl­ammonium, cyclo­butyl­ammonium, cyclo­pentyl­ammonium, and cyclo­hexyl­ammonium ( n = 1 , ); 21 , cyclo­hexyl­methyl­ammonium ( n = 1); 22 , 2-(1-cyclo­hexenyl)­ethyl­ammonium ( n = 1 , ); 23 , N -(amino­ethyl)­piper­idinium ( n = 1); 24 , N -benzyl­piper­azinium ( n = 1); 25 , piper­azinium ( n = 1); 26 , (carboxy)­cyclo­hexyl­methyl­ammonium ( n = 1); 27 , 3-(amino­methyl)­piper­idinium (3AMP, n = 1–4); 28 , 4-(amino­methyl)­piper­idinium (4AMP, n = 1–4); 29 , cyclo­hexyl­phos...…”

Eletron‐Spin Dynamics in the Two‐Dimensional Compound [NH3(CH2)4NH3]MnCl4

“…The crystal structure has been determined by Tichy et al [5]. The crystallographic parameters are a = 0.7177(3) nm, b = 0.7307(3) nm, c = 1.0770(5) nm, = 92.67(5)", space group P2Ja with Z = 2.…”