Gadolinium (III) chloride

Crystal structure
__ Gd 3+      __ Cl -
Crystal system	hexagonal
Space group	P 6 3 / m (No. 176)
Lattice parameters	a = 736.3 pm c = 410.5 pm
Coordination numbers	Gd [9], Cl [3]
General
Surname	Gadolinium (III) chloride
other names	Gadolinium trichloride
Ratio formula	GdCl 3
Brief description	white odorless powder light gray tubers (hexahydrate)
External identifiers / databases
CAS number 10138-52-0 19423-81-5 (unspecified hydrate) 13450-84-5 (hexahydrate) PubChem 61486 Wikidata Q415113
properties
Molar mass	263.61 g mol −1
Physical state	firmly
density	4.52 g cm −3 2.424 g cm −3  (hydrate at 25 ° C) 2.42 g cm −3  (hexahydrate at 25 ° C)
Melting point	609 ° C
solubility	soluble in water
safety instructions
GHS labeling of hazardous substances Caution H and P phrases H: 315-319 P: 305 + 351 + 338
Toxicological data	378 mg kg −1 ( LD 50 ,  mouse ,  ip ) 669 mg kg −1 ( LD 50 ,  mouse ,  ip , hexahydrate) 100 mg kg −1 ( LD 50 ,  chicken ,  iv , hexahydrate)
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Gadolinium (III) chloride is a chemical compound from the group of chlorides .

Extraction and presentation

Gadolinium (III) chloride can be obtained by reacting gadolinium with hydrochloric acid at 600 ° C.

${\displaystyle \mathrm {2\ Gd+6\ HCl\longrightarrow 2\ GdCl_{3}+3\ H_{2}} }$

It can also be obtained through the synthesis and subsequent thermal decomposition of (NH ₄ ) ₂ [GdCl ₅ ] at 300 ° C.

${\displaystyle \mathrm {10\ NH_{4}Cl+2\ Gd\longrightarrow 2\ (NH_{4})_{2}[GdCl_{5}]+6\ NH_{3}+3\ H_{2}} }$

${\displaystyle \mathrm {2\ (NH_{4})_{2}[GdCl_{5}]\longrightarrow (NH_{4}[Gd_{2}Cl_{7}]+3NH_{4}Cl)\longrightarrow 2\ GdCl_{3}+4\ NH_{4}Cl} }$

properties

Gadolinium (III) chloride is a colorless, hygroscopic, water-soluble compound which, in sufficiently pure form, crystallizes out of water and gives transparent clear crystals of a hexahydrate (GdCl ₃ • 6 H ₂ O). The hexahydrate is monoclinic with the space group P 2 / n (space group no. 13, position 2) and two formula units per unit cell . The anhydrous form has a crystal structure with the space group P 6 ₃ / m (no. 176) .

use

Gadolinium (III) chloride is used in the synthesis and NMR studies of the paramagnetic GdPCTA [12] and GdPCTA [13] complexes with possible use as a contrast agent for NMR.

Individual evidence

1. ↑ ^{a b} C. Au and R. Au: The crystal structure of GdCl ₃ , Acta Cryst. (1967), 23, p. 1112, doi: 10.1107 / S0365110X67004426 .
2. ↑ ^{a b c d} data sheet Gadolinium Chloride, Anhydrous ( Memento of the original from February 6, 2016 in the Internet Archive ) Info: The archive link has been inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. at gfschemicals.com, accessed June 18, 2017. 
3. ↑ ^{a b c d e f} data sheet Gadolinium (III) chloride hexahydrate, 99.999% from Sigma-Aldrich , accessed on April 28, 2012 ( PDF ).
4. ↑ ^{a b c d} data sheet Gadolinium (III) chloride, anhydrous, powder, 99.99% from Sigma-Aldrich , accessed on April 28, 2012 ( PDF ).
5. ↑ Data sheet Gadolinium (III) chloride hydrate, 99.99% from Sigma-Aldrich , accessed on April 28, 2012 ( PDF ).
6. ↑ ^{a b c} Hans Lohninger: Gadolinium (III) chloride
7. ↑ Gmelin's Handbook of Inorganic Chemistry: Gadolinium, Verlag Chemie GmbH, Berlin.
8. ↑ M. Marezio: The crystal structure of gadolinium trichloride hexahydrate , Acta Cryst. (1961), 14, pp. 234-236, doi: 10.1107 / S0365110X61000796 .