Rhenium trioxide or rhenium(VI) oxide is an inorganic compound with the formula ReO3. It is a red solid with a metallic lustre that resembles copper in appearance. It is the only stable trioxide of the Group 7 elements (Mn, Tc, Re).
Rhenium trioxide crystallizes with a primitivecubicunit cell, with a lattice parameter of 3.742 Å (374.2 pm). The structure of ReO3 is similar to that of perovskite (ABO3), without the large A cation at the centre of the unit cell. Each rhenium center is surrounded by an octahedron defined by six oxygen centers. These octahedra share corners to form the 3-dimensional structure. The coordination number of O is 2, because each oxygen atom has 2 neighbouring Re atoms.[3]
Propertiesedit
Physical propertiesedit
ReO3 is unusual for an oxide because it exhibits very low resistivity. It behaves like a metal in that its resistivity decreases as its temperature decreases. At 300 K, its resistivity is 100.0 nΩ·m, whereas at 100 K, this decreases to 6.0 nΩ·m, 17 times less than at 300 K.[3]
Chemical propertiesedit
Rhenium trioxide is insoluble in water, as well as dilute acids and bases. Heating it in base results in disproportionation to give ReO 2 and ReO− 4, while reaction with acid at high temperature affords Re 2O 7. In concentrated nitric acid, it yields perrhenic acid. Upon heating to 400 °C under vacuum, it undergoes disproportionation:[2]
^O. Glemser; R. Sauer (1963). "Rhenium (VII) Oxychloride". In G. Brauer (ed.). Handbook of Preparative Inorganic Chemistry, 2nd Ed. Vol. 2pages=1480. NY, NY: Academic Press.
^Nishimura, Shigeo (2001). Handbook of Heterogeneous Catalytic Hydrogenation for Organic Synthesis (1st ed.). New York: Wiley-Interscience. p. 408. ISBN9780471396987.
January 01, 1970
rhenium, trioxide, rhenium, oxide, inorganic, compound, with, formula, reo3, solid, with, metallic, lustre, that, resembles, copper, appearance, only, stable, trioxide, group, elements, names, iupac, name, other, names, rhenia, identifiers, number, 1314, model. Rhenium trioxide or rhenium VI oxide is an inorganic compound with the formula ReO3 It is a red solid with a metallic lustre that resembles copper in appearance It is the only stable trioxide of the Group 7 elements Mn Tc Re Rhenium trioxide Names IUPAC name Rhenium trioxide Other names Rhenia Identifiers CAS Number 1314 28 9 Y 3D model JSmol Interactive image ECHA InfoCard 100 013 845 EC Number 215 228 8 PubChem CID 102110 UNII FET0Y2C413 Y CompTox Dashboard EPA DTXSID0061662 InChI InChI 1S 3O Re SMILES O Re O O Properties Chemical formula ReO3 Molar mass 234 205 g mol Appearance Deep red crystals Density 6 92 g cm3 Melting point 400 C 752 F 673 K decomposes Magnetic susceptibility x 16 0 10 6 cm3 mol Refractive index nD 1 68 Structure Crystal structure Cubic cP4 Space group Pm3 m No 221 Lattice constant a 374 8 pm Except where otherwise noted data are given for materials in their standard state at 25 C 77 F 100 kPa N verify what is Y N Infobox references Contents 1 Preparation and structure 2 Properties 2 1 Physical properties 2 2 Chemical properties 3 Uses 3 1 Hydrogenation catalyst 4 ReferencesPreparation and structure editRhenium trioxide can be formed by reducing rhenium VII oxide with carbon monoxide at 200 C or elemental rhenium at 400 C 1 Re2O7 CO 2 ReO3 CO2 3 Re2O7 Re 7 ReO3 Re2O7 can also be reduced with dioxane 2 nbsp blue Rhenium red Oxygen nbsp ReO3 polyhedra Rhenium trioxide crystallizes with a primitive cubic unit cell with a lattice parameter of 3 742 A 374 2 pm The structure of ReO3 is similar to that of perovskite ABO3 without the large A cation at the centre of the unit cell Each rhenium center is surrounded by an octahedron defined by six oxygen centers These octahedra share corners to form the 3 dimensional structure The coordination number of O is 2 because each oxygen atom has 2 neighbouring Re atoms 3 Properties editPhysical properties edit ReO3 is unusual for an oxide because it exhibits very low resistivity It behaves like a metal in that its resistivity decreases as its temperature decreases At 300 K its resistivity is 100 0 nW m whereas at 100 K this decreases to 6 0 nW m 17 times less than at 300 K 3 Chemical properties edit Rhenium trioxide is insoluble in water as well as dilute acids and bases Heating it in base results in disproportionation to give ReO2 and ReO 4 while reaction with acid at high temperature affords Re2 O7 In concentrated nitric acid it yields perrhenic acid Upon heating to 400 C under vacuum it undergoes disproportionation 2 3 ReO3 Re2O7 ReO2 Rhenium trioxide can be chlorinated to give rhenium trioxide chloride 4 2 ReO3 Cl2 2 ReO3ClUses editHydrogenation catalyst edit Rhenium trioxide finds some use in organic synthesis as a catalyst for amide reduction 5 References edit H Nechamkin C F Hiskey Rhenium VI Oxide Rhenium Trioxide Inorganic Syntheses 1950 Volume 3 pp 186 188 doi 10 1002 9780470132340 ch49 a b O Glemser R Sauer 1963 Rhenium VI Oxide In G Brauer ed Handbook of Preparative Inorganic Chemistry 2nd Ed Vol 2pages 1482 NY NY Academic Press a b Greenwood Norman N Earnshaw Alan 1997 Chemistry of the Elements 2nd ed Butterworth Heinemann ISBN 978 0 08 037941 8 p 1047 O Glemser R Sauer 1963 Rhenium VII Oxychloride In G Brauer ed Handbook of Preparative Inorganic Chemistry 2nd Ed Vol 2pages 1480 NY NY Academic Press Nishimura Shigeo 2001 Handbook of Heterogeneous Catalytic Hydrogenation for Organic Synthesis 1st ed New York Wiley Interscience p 408 ISBN 9780471396987 Retrieved from https en wikipedia org w index php title Rhenium trioxide amp oldid 1192199821, wikipedia, wiki, book, books, library,
