Undistorted linear Bi chains with hypervalent bonding in La3TiBi5 from single-crystal X-ray diffraction
- Univ. of Delaware, Newark, DE (United States); University of Delaware
- Univ. of Delaware, Newark, DE (United States)
The crystal structure of the lanthanum titanium bismuthide La3TiBi5 (Pearson code hP18, Wyckoff sequence b d g2) has been established from single-crystal X-ray diffraction data and analyzed in detail using first-principles calculations. There are no anomalies pertaining to the atomic displacement parameter of the Ti site, previously reported based on a powder X-ray diffraction analysis of this compound. The anionic substructure contains columns of face-sharing TiBi6 octahedra and linear Bi chains. Due to a significant La(5d) and Bi(6p) orbital mixing, a perfectly one-dimensional character of the Bi chains is not realised, while a three-dimensional electronic structure is established instead. The latter fact explains the stability of the polyanionic pnictide units against Peierls distortions. The hypervalent bonding in the Bi chains is reflected in a rather long Bi—Bi distance of 3.2264 (4) Å and a typical pattern of bonding and antibonding interactions, as revealed by electronic structure calculations.
- Research Organization:
- Univ. of Delaware, Newark, DE (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
- DOE Contract Number:
- SC0008885
- OSTI ID:
- 1595736
- Journal Information:
- Acta Crystallographica. Section C, Structural Chemistry (Online), Journal Name: Acta Crystallographica. Section C, Structural Chemistry (Online) Journal Issue: 5 Vol. 74; ISSN 2053-2296; ISSN ACSCGG
- Publisher:
- International Union of Crystallography
- Country of Publication:
- United States
- Language:
- English
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