Samarium(III) oxalate
Names
Other names
Tris(oxalato)disamarium, Samarium oxalate,
Identifiers
ChemSpider
EC Number
InChI=1S/3C2H2O4.2Sm/c3*3-1(4)2(5)6;;/h3*(H,3,4)(H,5,6);;/q;;;2*+3/p-6
Key: DABIZUXUJGHLMW-UHFFFAOYSA-H
C(=O)(C(=O)[O-])[O-].C(=O)(C(=O)[O-])[O-].C(=O)(C(=O)[O-])[O-].[Sm+3].[Sm+3]
Properties
C 6 O 12 Sm 2
Molar mass
−1
Appearance
Yellow crystals
Insoluble
Hazards
GHS labelling
Warning
H302 , H312
P264 , P270 , P280 , P301+P312 , P302+P352 , P312 , P322 , P330 , P363 , P501
Related compounds
Related compounds
Praseodymium oxalate
Except where otherwise noted, data are given for materials in their
standard state (at 25 °C [77 °F], 100 kPa).
Chemical compound
Samarium(III) oxalate is an inorganic compound , a salt of samarium and oxalic acid with the formula Sm2 (C2 O4 )3 .[1] [2]
Synthesis
Precipitation of soluble samarium salts with oxalic acid:[3]
2
S
m
C
l
3
+
3
H
2
C
2
O
4
→
S
m
2
(
C
2
O
4
)
3
↓
+
6
H
C
l
{\displaystyle {\mathsf {2SmCl_{3}+3H_{2}C_{2}O_{4}\ {\xrightarrow {))\ Sm_{2}(C_{2}O_{4})_{3}\downarrow +6HCl))}
Also a reaction of samarium nitrate and oxalic acid in an aqueous solution:
2
S
m
(
N
O
3
)
3
+
3
H
2
C
2
O
4
→
S
m
2
(
C
2
O
4
)
3
↓
+
6
H
N
O
3
{\displaystyle {\mathsf {2Sm(NO_{3})_{3}+3H_{2}C_{2}O_{4}\ \xrightarrow {} \ Sm_{2}(C_{2}O_{4})_{3}\downarrow +6HNO_{3))))
Physical properties
Samarium(III) oxalate forms a crystalline hydrate of the composition Sm2 (C2 O4 )3 • 10H2 O with yellow crystals.
Chemical properties
Decomposes on heating:[4]
S
m
2
(
C
2
O
4
)
3
→
800
o
C
S
m
2
O
3
+
3
C
O
2
+
3
C
O
{\displaystyle {\mathsf {Sm_{2}(C_{2}O_{4})_{3}\ {\xrightarrow {800^{o}C))\ Sm_{2}O_{3}+3CO_{2}+3CO))}
Crystalline hydrate Sm2 (C2 O4 )3 • 10H2 O decomposes stepwise.[5]
