# Item

ITEM ACTIONSEXPORT

Released

Journal Article

#### EYPHKAMEN: Ln octahedron triples in Ln_{14}(C_{2})_{3}I_{20} with Ln = La, Ce

##### MPS-Authors

##### External Resource

No external resources are shared

##### Fulltext (restricted access)

There are currently no full texts shared for your IP range.

##### Fulltext (public)

There are no public fulltexts stored in PuRe

##### Supplementary Material (public)

There is no public supplementary material available

##### Citation

Mattausch, H., Simon, A., Kienle, L., Hoch, C., Zheng, C., & Kremer, R. K. (2006).
EYPHKAMEN: Ln octahedron triples in Ln_{14}(C_{2})_{3}I_{20} with Ln = La, Ce.*
Zeitschrift für anorganische und allgemeine Chemie,* *632*(10-11), 1661-1670.

Cite as: https://hdl.handle.net/21.11116/0000-000E-FBDE-E

##### Abstract

The compounds Ln(14)(C-2)(3)I-20 (Ln = La, Ce) are prepared from Ln.

LnI(3), and C molar ratio (11:10:9) at 920 degrees C (Ce) and 930

degrees C (La) as pure phases, forming polygonal black crystals with a

greenish lustre which are moisture and air sensitive. They are isotypic

and crystallize in the triclinic system, PI, with lattice parameters a

= 9.761(1) angstrom, b = 11.790(1)angstrom, c = 14.055(1) angstrom,

alpha = 79.60(1)degrees, beta = 71.49(1)degrees gamma = 65.79(1)degrees

(La-14(C-2)(3)I-20) and a = 9.688(1) angstrom. b = 11.670(1) angstrom,

c = 13.932(1) angstrom, alpha = 80.16(1)degrees, beta =

71.81(1)degrees, gamma = 65.88(1)degrees (Ce-14-(C-2)(3)I-20). In the

crystal structure the Ln atoms form Ln(6) octahedra centered by

C-groups. Three octahedra are condensed to the triples

((Ln(2)Ln(2)Ln(2/2)C(2))(2)(Ln(2)Ln(4/2)C(2)). The iodine atoms

coordinate the octahedra above all free edges as in a M6X12-type

cluster. The mean C-C distance in the C-2 unit is 1.39 angstrom. HRTEM

images of crystals selected from different batches prepared at lower

temperature show clusters of different lengths besides the triple

octahedra. Ce-14(C-2)(3)I-20 is a semiconductor and has an effective

magnetic moment of 2.38 mu(B).

LnI(3), and C molar ratio (11:10:9) at 920 degrees C (Ce) and 930

degrees C (La) as pure phases, forming polygonal black crystals with a

greenish lustre which are moisture and air sensitive. They are isotypic

and crystallize in the triclinic system, PI, with lattice parameters a

= 9.761(1) angstrom, b = 11.790(1)angstrom, c = 14.055(1) angstrom,

alpha = 79.60(1)degrees, beta = 71.49(1)degrees gamma = 65.79(1)degrees

(La-14(C-2)(3)I-20) and a = 9.688(1) angstrom. b = 11.670(1) angstrom,

c = 13.932(1) angstrom, alpha = 80.16(1)degrees, beta =

71.81(1)degrees, gamma = 65.88(1)degrees (Ce-14-(C-2)(3)I-20). In the

crystal structure the Ln atoms form Ln(6) octahedra centered by

C-groups. Three octahedra are condensed to the triples

((Ln(2)Ln(2)Ln(2/2)C(2))(2)(Ln(2)Ln(4/2)C(2)). The iodine atoms

coordinate the octahedra above all free edges as in a M6X12-type

cluster. The mean C-C distance in the C-2 unit is 1.39 angstrom. HRTEM

images of crystals selected from different batches prepared at lower

temperature show clusters of different lengths besides the triple

octahedra. Ce-14(C-2)(3)I-20 is a semiconductor and has an effective

magnetic moment of 2.38 mu(B).