Investigation of low-hydrated metal(II) nitrates. Syntheses and crystal structures of Zn(NO3)2 · H2O and M(II)(NO3)2 · 2 H2O (M = Mg, Mn, Co, Ni)
-
Manfred Wildner
Abstract
Crystals of Zn(NO3)2 · H2O and Mn(NO3)2 · 2 H2O were synthesized by heating melts of the respective penta- or hexahydrates. Single crystal X-ray diffraction of the two highly hygroscopic phases reveals new sheet-structure types: Zn(NO3)2 · H2O [Pbca, a = 9.722(1), b = 5.865(1), c = 17.799(3) Å (120 K), Z = 8, R1 = 0.025]; Mn(NO3)2 · 2 H2O [P212121, a = 5.921(1), b = 8.835(1), c = 22.882(3) Å (120 K), Z = 8, R1 = 0.020]. Zn(NO3)2 · H2O is built of only one kind of complicated, corrugated sheets held together by hydrogen bonds, while Mn(NO3)2 · 2 H2O is built of alternating sheets with Mn in 6- and 7-fold coordination, respectively, again interconnected by hydrogen bonds. While in Zn(NO3)2 · H2O the hydrogen bond system is quite clear-cut, this is not the case in Mn(NO3)2 · 2 H2O. Contrary to expectation, the thermal expansion is not clearly largest perpendicular to the sheets in both compounds.
In the well known structures of the nitrate dihydrates of Mg, Co and Ni new refinements allowed to locate the hydrogen atoms.
Together with Mn(II) nitrate monohydrate and the dihydrates of Mg, Co, Ni, Zn and Cd the two new nitrates form an interesting group of sheet structures.
© by Oldenbourg Wissenschaftsverlag, Wíen, Germany
Articles in the same Issue
- Investigation of low-hydrated metal(II) nitrates. Syntheses and crystal structures of Zn(NO3)2 · H2O and M(II)(NO3)2 · 2 H2O (M = Mg, Mn, Co, Ni)
- Crystal structure and infrared spectrum of new magnesium tetra-ammonium cyclotriphosphate tetrahydrate Mg(NH4)4(P3O9)2 · 4 H2O
- Copper(I) butyrate: a tetranuclear core revealed
- Interactions between oppositely-charged vs. those between like-charged species in crystal of aminoacetonitrile picrate: a charge density investigation
- Supramolecular aggregation patterns in mononuclear organomercury carboxylates
- Structures of N-(arenecarbonyl)-N,N′-dicyclohexylureas, cyclohexyl-NH—C(O)—N(cyclohexyl)—C(O)Ar, (Ar = Ph, pyridin-3-yl and pyrazinyl)
Articles in the same Issue
- Investigation of low-hydrated metal(II) nitrates. Syntheses and crystal structures of Zn(NO3)2 · H2O and M(II)(NO3)2 · 2 H2O (M = Mg, Mn, Co, Ni)
- Crystal structure and infrared spectrum of new magnesium tetra-ammonium cyclotriphosphate tetrahydrate Mg(NH4)4(P3O9)2 · 4 H2O
- Copper(I) butyrate: a tetranuclear core revealed
- Interactions between oppositely-charged vs. those between like-charged species in crystal of aminoacetonitrile picrate: a charge density investigation
- Supramolecular aggregation patterns in mononuclear organomercury carboxylates
- Structures of N-(arenecarbonyl)-N,N′-dicyclohexylureas, cyclohexyl-NH—C(O)—N(cyclohexyl)—C(O)Ar, (Ar = Ph, pyridin-3-yl and pyrazinyl)
