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1. Cover Feature: A Delicate Balance between Antiferromagnetism and Ferromagnetism: Theoretical and Experimental Studies of A ₂ MRu ₅ B ₂ (A=Zr, Hf; M=Fe, Mn) Metal Borides (Chem. Eur. J. 9/2020)

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   Shankhari, Pritam; Bakshi, Nika G.; Zhang, Yuemei; Stekovic, Dejan; Itkis, Mikhail E.; Fokwa, Boniface P. (January 2020, Chemistry – A European Journal)

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2. Late 3 d -Transition Metal Complexes Bearing a Bis -Phosphine Borane Ligand, PhB(CH ₂ P ^t Bu ₂ ) ₂

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3. OH-Si complex in hydrogenated n-type β -Ga ₂ O ₃ :Si

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4. Unexpected Hydride: Ce ₄ B ₂ C ₂ H _2.42 , a Stuffed Variant of the Nd ₂ BC Structure Type

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5. Rare‐earth Metal Substitution in Calcium Germanides with the Tetragonal Cr ₅ B ₃ Type Structure

   https://doi.org/10.1002/zaac.202200183  

   Suen, Nian‐Tzu; Bobev, Svilen (July 2022, Zeitschrift für anorganische und allgemeine Chemie)

   Abstract Calcium germanides with two mid‐late rare‐earth metals, Ca_5−xGd_xGe₃and Ca_5−xTb_xGe₃(x≈0.1−0.2), have been synthesized and structurally characterized. Additionally, a lanthanum‐rich germanide with calcium substitutions, La_5−xCa_xGe₃(x≈0.5) has also been identified. The three structures have been established from single‐crystal X‐ray diffraction methods and confirmed to crystallize with the Cr₅B₃‐type in the tetragonal space groupI4/mcm(no. 140;Z=4; Pearson symboltI32), where part of the germanium atoms are interconnected into Ge₂‐dimers, formally [Ge₂]⁶⁻. Rare‐earth metal and calcium atoms are arranged in distorted trigonal prisms, square‐antiprisms and cubes, centered by Ge or rare‐earth/calcium metal atoms. These studies show that the amount of trivalent rare‐earth metal atoms substituting divalent calcium atoms is in direct correlation with the lengths of the Ge−Ge bond within the Ge₂‐dimers, with distance varying between 2.58 Å in Ca_5−xGd_xGe₃and 2.75 Å in La_5−xCa_xGe₃. Such an elongation of the Ge−Ge bond is consistent with the notion that the parent Ca₅Ge₃Zintl phase (e. g. (Ca²⁺)₅[Ge₂]⁶⁻[Ge⁴⁻]) is being driven out of the ideal valence electron count and further reduced. In this context, this work demonstrates the ability of the germanides with the Cr₅B₃structure type to accommodate substitutions and wider valence electron count while maintaining their global structural integrity. 

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