SULFATE UND HYDROGENSULFATE DES ERBIUMS: ER(HSO4)3-I, ER(HSO4)3-II, ER(SO4)(HSO4) UND ER2(SO4)3
SULFATE UND HYDROGENSULFATE DES ERBIUMS: ER(HSO4)3-I, ER(HSO4)3-II, ER(SO4)(HSO4) UND ER2(SO4)3
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硫酸盐和硫酸氢铒:ER(HSO4)3-I、ER(HSO4)3-II、ER(SO4)(HSO4) 和 ER2(SO4)3
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发表时间:
1998
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通讯作者:
Mathias S. Wickleder
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作者:
Mathias S. Wickleder
Aus einer Losung von Er2(SO4)3 in konz. H2SO4 kristallisiert bei 250 °C Er(HSO4)3-I (orthorhombisch, Pbca, a = 1195,0(1) pm, b = 949,30(7) pm, c = 1644,3(1) pm) in Form hellrosa sauliger Kristalle. Aus 85%iger H2SO4-Losung, der Na2SO4 zugesetzt wurde, erhalt man bei 250 °C hellrosa quaderformige Kristalle von Er(HSO4)3-II (monoklin, P21/n, a = 520,00(5) pm, b = 1357,8(1) pm, c = 1233,4(1) pm, β = 92,13(1)°) und bei ca. 60 °C Kristalle gleicher Farbe von Er(SO4)(HSO4) (monoklin, P21/n, a = 545,62(6) pm, b = 1075,6(1) pm, c = 1053,1(1) pm, β = 104,58(1)°). In beiden Hydrogensulfaten ist Er3+ von acht Sauerstoffatomen umgeben. In Er(HSO4)3-I werden Schichten von HSO4–-Tetraedern ausschlieslich uber Wasserstoffbrucken zusammengehalten, wahrend bei Er(HSO4)3-II die Polyeder dreidimensional vernetzt sind. In der Kristallstruktur von Er(SO4)(HSO4) ist Er3+ von sieben Sauerstoffatomen umgeben, die zu vier SO42–- und drei HSO4–-Gruppen gehoren. Das wasserfreie Sulfat, Er2(SO4)3, ist nicht aus H2SO4-Losungen zuganglich, kann jedoch einkristallin aus einer NaCl-Schmelze erhalten werden. Die Koordinationszahl von Er3+ in Er2(SO4)3 (orthorhombisch, Pbcn, a = 1270,9(1) pm, b = 913,01(7) pm, c = 921,67(7) pm) ist sechs, die oktaedrischen Koordinationspolyeder sind uber alle Ecken mit SO42–-Tetraedern verknupft.
Sulfates and Hydrogensulfates of Erbium: Er(HSO4)3-I, Er(HSO4)3-II, Er(SO4)(HSO4), and Er2(SO4)3
Rod shaped light pink crystals of Er(HSO4)3-I (orthorhombic, Pbca, a = 1195.0(1) pm, b = 949.30(7) pm, c = 1644.3(1) pm) grow from a solution of Er2(SO4)3 in conc. H2SO4 at 250 °C. From slightly diluted solutions (85%) which contain Na2SO4, brick shaped light pink crystals of Er(HSO4)3-II (monoclinic, P21/n, a = 520.00(5) pm, b = 1357.8(1) pm, c = 1233.4(1) pm, β = 92.13(1)°) were obtained at 250 °C and crystals of the same colour of Er(SO4)(HSO4) (monoclinic, P21/n, a = 545.62(6) pm, b = 1075.6(1) pm, c = 1053.1(1) pm, β = 104.58(1)°) at 60 °C. In both hydrogensulfates, Er3+ is surrounded by eight oxygen atoms. In Er(HSO4)3-I layers of HSO4– groups are connected only via hydrogen bridges, while Er(HSO4)3-II consists of a threedimensional polyhedra network. In the crystal structure of Er(SO4)(HSO4) Er3+ is sevenfold coordinated by oxygen atoms, which belong to four SO42–- and three HSO4–-tetrahedra, respectively. The anhydrous sulfate, Er2(SO4)3, cannot be prepared from H2SO4 solutions but crystallizes from a NaCl-melt. The coordination number of Er3+ in Er2(SO4)3 (orthorhombic, Pbcn, a = 1270.9(1) pm, b = 913.01(7) pm, c = 921.67(7) pm) is six. The octahedral coordinationpolyhedra are connected via all vertices to the SO42–-tetrahedra.