Scandium transition metal carbides Sc3TC4 with T =Fe, Co, Ni, Ru, Rh, Os, Ir

Chemical bonding analysis and properties of La7Os4C9—A new structure type containing C- and C2-units as Os-coordinating ligands

“…In the course of this research all the known ternary carbides A x T y C z (A ¼ rare-earth metals and actinoids; T ¼ transition metals) containing monoatomic species C 4À have been classified into the groups of carbometalates and metal-rich carbides [1]. In addition, ternary carbides containing C 2 units are also known, e.g., RE 2 MnC 4 (RE ¼ Y, Er, Tm) [2], REFeC 2 (RE ¼ Y, Sm, Gd-Lu) [3], RE 2 FeC 4 (RE ¼ Y, Tb-Lu) [4], RENiC 2 (RE ¼ Y, La-Nd, Sm, Gd-Ho) [5], RECoC 2 (RE ¼ Y, La-Nd, Sm, Gd-Lu) [6], and Sc 3 TC 4 (T ¼ Fe, Co, Ni, Ru, Rh, Os, Ir) [7]. An example with C 3 units is Sc 5 Re 2 C 7 [8].…”

Planar Fe6 Cluster Units in the Crystal Structure of RE15Fe8C25 (RE=Y, Dy, Ho, Er)

“…[1] In the systems REFeC, several ternary phases fulfilling this compositional condition have been reported. However, their crystal structures either contain C 2 pairs as structural units instead of monoatomic carbo ligands, such as RE 2 [Fe(C 2 ) 4/2 ] (RE = Y, Tb-Lu), [2] Sc 3 [Fe(C 2 ) 4/2 ], [3,4] RE-[FeC 2 ] (RE = Sc, Sm, Gd-Er, Lu), [5,6] and RE 3.67 [Fe(C 2 ) 3 ] (RE = La-Nd, Sm) [7,8] ), or the crystal structures have not been determined (GdFeC, RE 2 Fe 2 C 3 , RE 4 Fe 4 C 7 (RE = Ce, Gd)). [9,10] Our continuous search for carboferrates exclusively containing monoatomic carbo ligands has been unsuccessful so far.…”

“…Further assumptions concern the charges of the mono-and diatomic carbon ligands based on the crystal-chemical concept of carbometalates [1] as well as on experimental values of CÀC distances in C 2 pairs. [2][3][4][5][6][7][8][9][10] For the present compounds, these data allow one to count the monoatomic carbon as C 4À , and the diatomic species as C 2 4À . The iron clusters (Fe1, Fe2) in the crystal structure are interconnected by Fe3 in a trigonal-planar coordination arrangement by C 2 pairs.…”

45Sc Solid State NMR Spectroscopy – A Complementary Tool to X‐ray Crystallography for Structure Determination of Intermetallic Compounds

“…The carbides Sc 3 TC 4 (T = Mn, Fe, Co, Ni, Ru, Rh, Os, Ir) [52,[62][63][64][65][66] have complex structural behavior. They crystallize with a pronounced subcell structure which was first refined for the cobalt compound [67].…”