| Abstract
| - Synthesis, and single-crystal X-ray diffraction andcomputational studies were carriedout for the title compound. LaNiGe2 crystallizes inthe orthorhombic lattice Cmcm (a =4.3040(6) Å, b = 16.892(10) Å, c= 4.2367(5) Å, Z = 4). It consists of aNi-capped Ge squarelattice and Ge zigzag chains. A unique structural feature is theformation of the squarelattice by the more electronegative Ge instead of by Ni atoms as inseveral other phasessuch as La3Ni4Ge4.Computational analysis indicates that the Ge square lattice actsas anelectron donor while the Ge zigzag chain acts as electron acceptor.A donor−acceptorinteraction similar to that in theCaBe2Ge2 phase stabilizes the Ge squarelattice.
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