Yttrium oxalate
Yttrium oxalate is an inorganic compound, a salt of yttrium and oxalic acid with the chemical formula Y. The compound does not dissolve in water and forms crystalline hydrates—colorless crystals.
Synthesis
Precipitation of soluble yttrium salts with oxalic acid:Properties
Yttrium oxalate is highly insoluble in water and converts to the oxide when heated. Yttrium oxalate forms crystalline hydrates with the formula Y•n HO, where n = 4, 9, and 10.Decomposes when heated:
The solubility product of yttrium oxalate at 25 °C is 5.1 × 10−30.
The trihydrate Y•3HO is formed by heating more hydrated varieties at 110 °C.
Y forms monoclinic crystals with unit cell dimensions a=9.3811 Å, b=11.638 Å, c=5.9726 Å, β=96.079°.
Related
Several yttrium oxalate double salts are known containing additional cations. Also a mixed-anion compound with carbonate is known.| formula | name | formula weight | crystal form | space group | unit cell Å | volume Å3 | properties | references |
| NH4Y2.H2O | Ammonium yttrium oxalate monohydrate | monoclinic | P2/n | a=9.18 b=6.09 c=7.89 β=90.2 Z=2 | ||||
| 0.5·2H2O | 377.1 | triclinic | P | a = 8.229, b = 9.739, c = 9.754, α = 60.74, β = 72.36, γ = 84.67°, Z = 2 | 648.5 | density 1.931 | ||
| 365.1 | monoclinic | Cc | a = 11.552, b = 17.168, c = 8.719, β = 130.64°, Z = 2 | 1312.1 | density 1.848 | |||
| C5NH6Y2•3H2O | Pyridinium yttrium oxalate trihydrate | |||||||
| Na2.3H2O | yttrium sodium oxalate tetrahydrate | 360.005 | monoclinic | Pc | a=8.623 b=8.6310 c=14.896 β=102.848 Z=4 | 1080.9 | ||
| YK2.4H2O | Yttrium potassium oxalate tetrahydrate | tetragonal | I41/a | Z = 4 a = 11.4612, c = 8.9040 | 1169.6 | |||
| YCs2 | Caesium yttrium oxalate monohydrate | monoclinic | P2/n | a = 8.979, b = 6.2299, c = 8.103, β = 90.05° | 453.3 | |||
| RbLn2•3H2O | Rubidium yttrium oxalate trihydrate | |||||||
| 22 | yttrium oxalate carbonate | 421.876 | orthorhombic | C2221 | a = 7.8177, b = 14.943, c = 9.4845, Z = 4 | 1108.0 | density 2.526 |