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- W2078113949 abstract "Abstract Nd 3 N 2 SeBr: A New Nitride Selenide Bromide of Neodymium with $rm ^{1}_{infty}{[N_{2}Nd_{3}]^{3+}}$ Strands of Highly Condensed [NNd 4 ] 9+ Tetrahedra The oxidation of neodymium powder with selenium and sodium azide (NaN 3 ) in the presence of neodymium tribromide (NdBr 3 ) yields neodymium nitride selenide bromide with the composition Nd 3 N 2 SeBr when appropriate molar ratios of the reactants are used. Additional sodium bromide (NaBr) as a flux secures fast reactions (7 d) at 900 °C in evacuated silica tubes as well as the formation of dark brown single crystals. The orthorhombic crystal structure ( Pnma , Z = 4) was determined from single crystal X‐ray diffraction data ( a = 1288.13(9), b = 405.22(3), c = 1206.29(8) pm). There are three crystallographically different Nd 3+ cations present. Nd1 resides in eightfold coordination of four N 3− , two Se 2− and two Br − anions forming a square antiprism and Nd2 is coordinated by three N 3− , one Se 2− and three Br − in the shape of a monocapped trigonal prism. Finally, an octahedral coordination sphere of one N 3− , three Se 2− and two Br − anions surrounds Nd3. However, the main feature in the crystal structure comprises N 3− ‐centred (Nd 3+ ) 4 tetrahedra arranged as chains $rm ^{1}_{infty}{[NNd_{2}]^{3+}}$ of cis ‐edge connected [NNd 4 ] 9+ units first, which are further connected via two more edges to form strands $rm ^{1}_{infty}{[N_{2}Nd_{3}]^{3+}}$ of highly condensed all‐ cisoid oriented [NNd 4 ] 9+ tetrahedra. They get bundled along [010] like a hexagonal rod packing and are held together by two radiographically indistinguishable Se 2− and Br − anions, which thereby also achieve the charge balance." @default.
- W2078113949 created "2016-06-24" @default.
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- W2078113949 date "2007-08-27" @default.
- W2078113949 modified "2023-10-16" @default.
- W2078113949 title "Nd3N2SeBr: Ein neues Nitridselenidbromid des Neodyms mit-Strängen aus hochkondensierten [NNd4]9+-Tetraedern" @default.
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- W2078113949 doi "https://doi.org/10.1002/zaac.200700264" @default.
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