In:
European Journal of Inorganic Chemistry, Wiley, Vol. 2019, No. 31 ( 2019-08-25), p. 3572-3580
Abstract:
RE Mo 2 B 5 ( RE = Ce, Pr, Nd) and CeW 2 B 5 have been synthesized by arc melting with further annealing at 1300 °C. CeMo 2 B 5 crystallizes in a new structure type with space group Pnma, a = 11.0298(2) Å, b = 3.12080(5) Å, c = 9.9594(2) Å, Z = 4. Its structural arrangement reveals puckered [B 6 ]‐hexagonal rings, trigonal‐prismatic‐ and empty pyramidal‐tetrahedral‐slabs. The structure can be related to the derivatives of AlB 2 and CrB prototypes. The boron atoms form a two‐dimensional network of corrugated ribbons, each composed of four edge‐linked [B 6 ] rings infinitely extending along the b ‐axis. CeMo 2 B 5 is a Pauli paramagnet. Electrical transport measurements together with the calculated density of states at the Fermi level of 3.81 states eV –1 f.u. –1 indicate CeMo 2 B 5 to be a typical metallic system. Electronic structure calculations reveal significant hybridization of Ce 4 f 5 d states with Mo 4 d states. The chemical bonding scenario is dominated by chains of [Ce 2 Mo 2 ] clusters with multi‐center bonds. These clusters are connected via metallic Mo–Mo bonds. This metal‐framework, in turn, is stabilized by bonding interactions with the boron ribbons to which it donates elec trons.
Type of Medium:
Online Resource
ISSN:
1434-1948
,
1099-0682
DOI:
10.1002/ejic.v2019.31
DOI:
10.1002/ejic.201900411
Language:
English
Publisher:
Wiley
Publication Date:
2019
detail.hit.zdb_id:
1475009-0
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