Kristallstrukturen des Sr(BrO₃)₂ · H₂O, Ba(BrO₃)₂ · H₂O, Ba(IO₃)₂ · H₂O, Pb(CIO₃)₂ · H₂O und Pb(BrO₃)₂ · H₂O

Abstract

Die Kristallstrukturen der isotypen monoklinen Halogenate Sr(BrO3)2 · H2O, Ba(BrO3)2 · H2O, Ba(IO3)2 · H2O, Pb(ClO3)2 · H2O und Pb(BrO3)2 · H2O wurden anhand von Röntgeneinkristalldaten bestimmt (C2/cC 2h6, Z = 4). Die gemittelten Bindungsabstände und ‐winkel der Halogenationen der im Ba(ClO3)2 · 1 H2O‐Typ kristallisierenden Verbindungen (ClO: 149,0, BrO: 165,9 und IO: 180,2 pm sowie ClO3−: 106,4, BrO3−: 104,0 und IO3−: 99,6°) entsprechen denen anderer Halogenate. Eine mögliche Orientierungsfehlordnung der Kristallwassermoleküle, die Stärke der vorhandenen Wasserstoffbrücken, der Einfluß der Bleiionen auf die Struktur sowie die unterschiedliche Lagegruppenverzerrung der Halogenationen werden diskutiert.

Neutron diffraction study of Sr(BrO3)2·H2O:statistical tests of intensity variances, refinement including weak and negative intensities

“…As already pointed out by Lutz, Alici and Buchmeier (1985) and Lutz, Kellersohn and Vogt (1990), the thermal parameter t/ 33 of the water oxygen Brought to you by | New York University Bobst Library Technical Service Authenticated Download Date | 7/25/15 10:30 PM 0(4) is strikingly large, the same applies to U 33 of Η determined in the present work. Split positions of 0(4) decrease U 33 of 0(4) by a factor three but do not change the goodness-of-fit parameter.…”

“…Sr(Br0 3 ) 2 • H 2 0 belongs to the Ba(C10 3 ) 2 · H 2 0-type compounds, which have been subject of structural and spectroscopic investigations with special respect to the water of crystallization Lutz, Alici andBuchmeier 1985: Lutz, Christian andSasidhar and Rao. 1986;Henning.…”

Caesium and hydrated lead chlorates studied by35Cl NQR spectroscopy

“…6 the relaxation time T, has been estimated as 52 ms at ambient temperature. Lead chlorate crystallizes in the rhombic system of symmetry [8,9]. The presence of water significantly affects the melting point, which for the unhydrated form is 503 K, while it is 383 K for the hydrated.…”

A comparative study of the crystal structures of Ba(ClO3)2, Ba(BrO3)2 II, Pb(ClO3)2, and Sr(ClO3)2

“…Thus, the only crystal structures [apart from some hydrates as, for example, the Ba(C10 3 ) 2 · H 2 0-type compounds (Lutz et al, 1985a) and Cu(Br0 3 ) 2 ·2Η 2 0 (Markin et al, 1985)] known are those of orthorhombic Sr(C10 3 ) 2 and monoclinic Sr(Br0 3 ) 2 (Cc, Lutz et al, 1985b). Thus, the only crystal structures [apart from some hydrates as, for example, the Ba(C10 3 ) 2 · H 2 0-type compounds (Lutz et al, 1985a) and Cu(Br0 3 ) 2 ·2Η 2 0 (Markin et al, 1985)] known are those of orthorhombic Sr(C10 3 ) 2 and monoclinic Sr(Br0 3 ) 2 (Cc, Lutz et al, 1985b).…”