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Undistorted linear Bi chains with hypervalent bonding in La3TiBi5 from single-crystal X-ray diffraction

Journal Article · · Acta Crystallographica. Section C, Structural Chemistry (Online)

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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