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Merging the AuCu3- and BaAl4-based structure motifs: flux-assisted synthesis, crystal, and electronic structure of Ca2Pt7XP4−δ phosphide platinides (X = Al, Ti, and Zn)
Dalton Transactions ( IF 3.5 ) Pub Date : 2022-11-23 , DOI: 10.1039/d2dt03367d
Anastasiya Yu Makhaneva 1 , Elena Yu Zakharova 1 , Sergey N Nesterenko 1 , Konstantin A Lyssenko 1, 2 , Alexey N Kuznetsov 1
Affiliation  

Three quaternary phosphide platinides, Ca2Pt7AlP3.00(4), Ca2Pt7TiP3.24(4), and Ca2Pt7ZnP2.78(2), were synthesized by a high-temperature technique using lead as a flux. According to the single-crystal diffraction data, they are isotypic and crystallize in the tetragonal space group I4/mmm with Z = 2 (Ca2Pt7AlP3.00(4): a = 3.9893(6) Å, c = 26.832(5) Å; Ca2Pt7TiP3.24(4): a = 3.99610(10) Å, c = 26.9074(17) Å; Ca2Pt7ZnP2.78(2): a = 4.0020(2) Å, c = 26.5549(17) Å) and thus represent first europium-free compounds of the Eu2Pt7AlP2.95 structure type. Their structures can be described as an intergrowth of the AuCu3- and CaBe2Ge2-type blocks. DFT calculations predict metallic conductivity and non-magnetic state for all three compounds. Bonding analysis based on the Bader charge distribution and ELF topology reveals a combination of localized covalent and ionic interactions in the CaBe2Ge2-type fragments and complex pattern of pairwise, multi-center, and ionic interactions in the AuCu3-type fragments that closely reproduces bonding in the parent Pt3X (X = Al, Ti, Zn) binary intermetallics.

中文翻译:

合并基于 AuCu3 和 BaAl4 的结构基序:Ca2Pt7XP4−δ 磷化铂(X = Al、Ti 和 Zn)的助焊剂合成、晶体和电子结构

以铅为助熔剂,采用高温法合成了三种季磷化铂Ca 2 Pt 7 AlP 3.00(4)、Ca 2 Pt 7 TiP 3.24(4)和Ca 2 Pt 7 ZnP 2.78(2) 。根据单晶衍射数据,它们是同型的,在四方空间群I 4/ mmm中结晶,Z = 2 (Ca 2 Pt 7 AlP 3.00(4) : a = 3.9893(6) Å, c = 26.832( 5) Å; Ca 2 Pt 7TiP 3.24(4)a = 3.99610(10) Å,c = 26.9074(17) Å;Ca 2 Pt 7 ZnP 2.78(2) : a = 4.0020(2) Å, c = 26.5549(17) Å),因此代表第一个不含铕的 Eu 2 Pt 7 AlP 2.95结构类型的化合物。它们的结构可以描述为 AuCu 3 - 和 CaBe 2 Ge 2的共生型块。DFT 计算预测了所有三种化合物的金属导电性和非磁性状态。基于 Bader 电荷分布和 ELF 拓扑结构的成键分析揭示了 CaBe 2 Ge 2型碎片中局部共价和离子相互作用的组合以及 AuCu 3型碎片中成对、多中心和离子相互作用的复杂模式紧密再现母体 Pt 3 X(X = Al、Ti、Zn)二元金属间化合物中的键合。
更新日期:2022-11-23
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