Preparation and crystal structure of mercury hexafluoroniobate (Hg3NbF6) and mercury hexafluorotantalate (Hg3TaF6): mercury layer compounds

Mercury Phosphates with the Triangular Hg4+3 Cluster: (Hg3)3(PO4)4 and (Hg3)2(HgO2)(PO4)2

“…Exceeding of the solubility product during decrease of temperature leads to the crystallization of the complex salts -(Hg ) (PO ) , (Hg ) (PO ) , and (Hg ) (HgO )(PO ) (Eq. [7]). The existence of elemental mercury obtained in small amounts during some experiments could also be explained (Eq.…”

“…These cluster compounds could be subdivided into linear arrangements of mercury atoms with n"3 (2}4), n"4 (4, 5), and n"R (6), systems with a layer arrangement (7), and systems with a triangular con"guration of mercury atoms. For the latter the cluster composition is Hg> .…”

A Barium Vanadium(V) Selenite Hydrate, Ba(VO2)2(SeO3)2·H2O: A Novel 3D Polymer of Cross-Linked Sheets with Embedded ···V–O–V··· 21 Helices

“…The bond valence sums (BVS) [11] of Se(1,2) are 3.98, 3.96 respectively. The barium atom in each of the two structures is coordinated by both 'vanadate' and selenate oxygen atoms, with, in the present case, a water molecule, despite the diminution in coordination number from ten to nine.…”

“…[12] (9) 113.59 (12) 164.17 (10) 65.03 (9) 107.11 (9) 87.49 (10) 88.53(9) O(4) 3.090 (3) 104.68 (8) 149.21 (11) 126.00 (9) 78.54 (9) 78.52 (9) 52.27(9) 120.12(9) O (8) 3.046 (3) 73.22 (12) 123. 10(9) 78.76 (9) 130.72 (9) 116.82 (9) 52.02 (9) Transformations of the asymmetric unit: (i) 1 À x, 2 À y, 1 À z; (ii) 1 À x, 1 À y, 1 À z; (iii) x, 1 þ y, z; (iv) x, y À 1 2 , 3 2 À z; (v) 1 À x, y À 1 2 , 3 2 À z; (vi) x, 1 2 þ y, 3 2 À z; (vii) 1 À x, 1 2 þ y, 3 2 À z; (viii) x, y À 1, z; (ix) x, y, z.…”

On the accurate bond-valence parameters for the Sb3+/O2−ion pair

“…Brown & Wu, 1976;Locock & Burns, 2004) or s ij (e.g. Brown et al, 1984) values, or by using linear least-squares fitting (of r 0 and b) against the expected ln(s ij ) values (e.g. Brown, 2009a).…”