Structure of thallium nitroprusside

Structure of calcium nitroprusside tetrahydrate

“…1 shows the very distorted octahedral configuration of the nitroprusside ion. The equatorial CN groups lie on a conical surface with the axis along the Fe-C(5) direction and an apical angle of about 85 ° The Fe atom is displaced towards the nitrosyl group, the Fe-N distance, 1.66 A, is shorter than Fe-C distances (mean 1.94/~), in agreement with determinations on the other nitroprussides (Manoharan & Hamilton, 1963;Lanfranconi, Alvarez & Castellano, 1973;Castellano, Piro & Rivero, 1977a,b;Rigotti, Punte, Rivero & Castellano, 1980). This configuration supports the interpretation of Ballhausen & Gray (1963) and the MO calculations of Manoharan & Gray (1965) and Tullberg & Vannenberg (1967) concerning bonding in the nitroprusside ion.…”

Powder X-ray diffraction study of disilver(1+) pentacyanonitrosylferrate(2−)

“…No systematic absences were observed, which means that there are three possible space groups: P2, Pm and P2lm. Previous structural determinations on nitroprusside salts (Castellano et al, 1978;Bottomley and White, 1979;Rigotti et al, 1980) show that the nitroprusside anion has a very distorted octahedral configuration with the metal atom displaced from the equatorial cyanide plane toward the nitrosyl group. Taking into account this geometry and the length of the b axis (6.4080 A), the two space groups containing planes of symmetry were discarded and we propose P2 symmetry for the studied compound.…”