Preparation, characterization, and x-ray crystal structures of S2I4(MF6)2 (M = As, Sb) and the electronic structure of the highly .pi.-bonded eclipsed disulfur tetraiodine(2+) cation: thermodynamic considerations and the nonexistence of SI3AsF6(s)

1992 ◽  
Vol 31 (2) ◽  
pp. 273-283 ◽  
Author(s):  
Michael P. Murchie ◽  
James P. Johnson ◽  
Jack Passmore ◽  
George W. Sutherland ◽  
Mahmoud Tajik ◽  
...  
Author(s):  
Nazar Zaremba ◽  
Ihor Muts ◽  
Volodymyr Pavlyuk ◽  
Viktor Hlukhyy ◽  
Rainer Pöttgen ◽  
...  

Abstract The title compounds have been synthesized by reaction of the elements in sealed tantalum crucibles in a muffle furnace using special annealing sequences. The crystal structures of YbNi2.31Al2.69 (R1 = 0.0100 for 212 F 2 values and 18 variables) and for ErNi2.23Al2.77 (R1 = 0.0154 for 255 F 2 values and 18 variables) were refined from single crystal X-ray data. They belong to the YNi2Al3 type (i3 superstructure of CaCu5) with the following crystallographic parameters: space group P 6 / m m m $P6/mmm$ , Pearson’s symbol hP18, Z = 3, a = 8.2723(12), c = 4.0672(8) Å, V = 241.03(8) Å3 for YbNi2.31Al2.69 and a = 8.9109(13), c = 4.0669(8) Å, V = 279.66(8) Å3 for ErNi2.23Al2.77. The crystal chemical discussion is supported by electronic structure calculations.


Polyhedron ◽  
2021 ◽  
pp. 115168
Author(s):  
Julia A. Brown ◽  
Alexandra L. Chaparro ◽  
Leah C. McCarthy ◽  
Sophia C. Moniodes ◽  
Erin E. Ostrowski ◽  
...  

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