Darstellung, Struktur und magnetische Eigenschaften von Erdalkali-Mangan-Verbindungen AMnX mit A = Mg, Ca, Sr, Ba und X = Si, Ge, Sn

Synthesis, Structure, and Chemical Bonding in CaCoSi

“…Certain differences can be observed when comparing CaCoSi with the isostructural Mn‐containing compound 18b. The metallic radius of Mn is larger than that of Co 27.…”

Layered Hydride CaNiGeH with a ZrCuSiAs-type Structure: Crystal Structure, Chemical Bonding, and Magnetism Induced by Mn Doping

“…The excess electrons can be consumed by insertion of H into the Re 4 tetrahedron, leading to ReTXH, − where H is negatively charged and thus serves as the electron sink. For the case of Ae-based 111-type compounds, such as AeTGe (Ae = Mg, Ca, Sr, and Ba; T = Mn, Fe, Co, and Ni), − the octet rule is already obeyed as they are electronically balanced. In this respect, the exploration of the hydride for these Ae-based compounds will provide new insight into the understanding of hydrogenation behavior and coordination for hydrogen in these systems.…”

Polar Intermetallic Compounds as Catalysts for Hydrogenation Reactions: Synthesis, Structures, Bonding, and Catalytic Properties of Ca1−xSrxNi4Sn2 (x=0.0, 0.5, 1.0) and Catalytic Properties of Ni3Sn and Ni3Sn2

“…The novel structures were established by single-crystal X-ray diffraction. They crystallize in the tetragonal space group I4/mcm with parameters: a = 7.6991 (7), c = 7.8150 (8) , wR2 = 0.034, 162 F 2 values, 14 variable parameters for CaNi 4 Sn 2 ; a = 7.7936(2), c = 7.7816(3) , wR2 = 0.052, 193 F 2 well-defined intermetallic compounds is an alternative approach and is especially suited to the search of new catalysts and only a few attempts have been made to correlate the bulk properties of unsupported, well-defined alloys with their catalytic activity. [1] To find novel intermetallic compounds that can be used as hydrogenation catalysts, we started to investigate binary and ternary phase diagrams of more electropositive metals, such as alkaline-earth metals (AE), a late transition metal, and Group 14 element as components.…”

“…Previous investigations revealed that in all AE-T-Sn compounds (AE = Ca, Sr, Ba; T = transition metal), the transition metal and tin atoms build a two-or three-dimensional [T x Sn y ] polyanion, in which the Ca, Sr, or Ba atoms separate the polyanionic layers or fill channels within the polyanions. [7][8][9][10][11][12][13][14] The structural features of the T-Sn network are reminiscent of the catalyst/co-catalyst scenario of a bimetallic system. In contrast to calcium, strontium, and barium and owing to its small size, magnesium often exhibits significant mixing with tin atom sites and might induce a change of the structure type in a series of solid solutions.…”

“…At the start of our investigations, only three compounds in those systems had been reported: Ca 7 Ni 4 Sn 13 5 SrNiSn 2 , and SrNiSn 3 6. Previous investigations revealed that in all AE ‐ T ‐Sn compounds ( AE =Ca, Sr, Ba; T =transition metal), the transition metal and tin atoms build a two‐ or three‐dimensional [ T x Sn y ] polyanion, in which the Ca, Sr, or Ba atoms separate the polyanionic layers or fill channels within the polyanions 7–14. The structural features of the T ‐Sn network are reminiscent of the catalyst/co‐catalyst scenario of a bimetallic system.…”