Wyllieite-type Ag_1.09Mn_3.46(AsO₄)₃

Abstract

Single crystals of wyllieite-type silver(I) manganese(II) tris­orthoarsenate(V), Ag1.09Mn3.46(AsO4)3, were grown by a solid-state reaction. The three-dimensional framework is made up from four Mn2+/Mn3+ cations surrounded octa­hedrally by O atoms. The MnO6 octa­hedra are linked through edge- and corner-sharing. Three independent AsO4 tetra­hedra are linked to the framework through common corners, delimiting channels along [100] in which two partly occupied Ag+ sites reside, one on an inversion centre and with an occupancy of 0.631 (4), the other on a general site and with an occupancy of 0.774 (3), both within distorted tetra­hedral environments. One of the Mn sites is also located on an inversion centre and is partly occupied, with an occupancy of 0.916 (5). Related compounds with alluaudite-type or rosemaryite-type structures are compared and discussed.

Non-centrosymmetric Rb2Mn2(MoO4)3

“…(2) Å, conforment à celles observées dans la littérature (Souilem et al, 2014;Sebastian et al, 2003;Frigui et al, 2012;Leclaire et al, 1988 (Solodovnikov et al, 1986) (Solodovnikov et al, 1997) (Brahim & Amor, 2003;Warner et al, 1993;Korzenski et al, 1998;Chouaibi et al, 2001;Pertlik, 1987;Antenucci et al, 1995;Zid et al, 2005;Chaalia et al, 2012;Hatert et al, 2004;Lii & Shih, 1994) where P = (F o 2 + 2F c 2 )/3 (Δ/σ) max < 0.001 Δρ max = 1.03 e Å −3 Δρ min = −0.96 e Å −3 Extinction correction: SHELXL97 (Sheldrick, 2008), Fc * =kFc[1+0.001xFc 2 λ 3 /sin(2θ)] -1/4 Extinction coefficient: 0.0049 (4) Absolute structure: Flack (1983) Refinement. Refinement of F 2 against ALL reflections.…”

“…For details of structurally different compounds, see: Brahim & Amor (2003); Warner et al (1993); Korzenski et al (1998); Chouaibi et al (2001); Pertlik (1987); Antenucci et al (1995); Zid et al (2005); Hatert et al (2004); Lii & Shih (1994). For bond lengths, see: Souilem et al (2014); Frigui et al (2012); Leclaire & Raveau (1988); Sebastian et al (2003) and for bond-valence sums, see: Brown & Altermatt (1985).…”

Na1.67Mn2.17(MoO4)3

“…For background to the physico-chemical properties of related compounds, see: Gueho et al (1993); Piffard et al (1985); Solodovnikov et al (1986Solodovnikov et al ( , 1997Solodovnikov et al ( , 1998; Prabaharan et al (1997). For details of structurally related compounds, see: Frigui et al (2011Frigui et al ( , 2012; Guesmi & Driss (2012); Belkhiri et al (2009); Ché rif et al…”

“…3b et 3c). De plus, les distances moyennes Mn-O, et Na-O, égales respectivement à 2,176 (2) Å et 2,492 (2) Å, sont comparables à celles rencontrées dans des travaux antérieurs(Frigui et al, 2012;Guesmi & Driss, 2012). Ainsi, le calcul des différentes valences de liaison (BVS), utilisant la formule empirique de Brown(Brown & Altermatt, 1985), conduit aux valeurs des charges des ions suivants: Mo1 (5,81), Mo2 (5,83), Mo3(5,94), Mn1 (2,01), Mn2 (2,02), Na1(0,93), Na2(0,61), Na3/Mn3 (1,28), ce qui confirme les degrés d'oxydation des différents ions attendus dans la structure.…”

“…et Ag 1,09 Mn 3.46 (AsO 4 ) 3(Frigui et al 2012). En effet, dans l'arséniate K 1,65 V 1,78 W 0,22 O 2 (AsO 4 ) 2 les octaèdres MO 6 (M = W/V ou V) et les tétraèdres AsO 4 sont reliés par mise en commun de sommets pour former deux chaînes similaires [MAsO 8 ] et [VAsO 8 ] disposées respectivement selon a et c. Leur connexion est assurée seulement par formation de ponts mixtes entre octaèdres et tétraèdres.…”