Sodium dicyanoargentate(I)

Abstract

Na[Ag(CN)2], Mr = 182-90, monoclinic, C2/c, a = 6-572 (1), b = 3-710 (1), c = 17.346 (2)/~, fl = 92.05 (1) °, V = 422.66/~3, Z=4, Dx = 2.874 Mg m -3, A(Mo Kte) = 0.71073/~, /x = 4.527 mm-1, F(000) = 336. The structure was refined to R=0.072, wR=0.052 for 293 absorptioncorrected observed reflections. The Ag atoms of linear NC--Ag---CN groups are arranged in layers parallel to (001). The Na ions occupy octahedral holes between pseudohexagonal nitrogen layers with the sequence ABAB.Experimental. This very stable compound is easily obtained by reaction of NaCN with AgCN in aqueous suspension. All attempts, however, to grow good-quality single crystals failed up to now, so that only powder diffraction data have been recorded in the literature. We have succeeded in growing single crystals by slow recrystallization from a 1:1 ethanolwater mixture. Unfortunately most of these crystals were also of poor quality, mainly because of intergrowth and a high degree of disorder. After inspection of a large number of crystals by microscopy and film methods a clear crystal fragment (30 x 30 × 60 Ixm) could be isolated, which proved suitable for a structure determination. Gandolfi and Guinier patterns showed the fragment to be the same phase as the other crystals and the bulk material.For data collection, an Enraf-Nonius CAD-4 diffractometer was used (MoKa, A=0.71073A, graphite monochromator). Lattice parameters were refined from 20 values of 25 reflections in the range 4.8-36 °. Intensities measured for 2 _< 0___ 20°; oy-20-scan technique (scan width 0.85 ° + 0.34 ° tan0). Three standard reflections indicated a 2.2% loss of intensity during data collection. Mergin~ of the 1308 collected intensities [(sin0)max/A = 0.481 A; -5 _< h <_ + 5, -5 ___ k ___ + 5, -24 _< l ___ + 24] gave 293 unique reflections (Rin t = 0"031) with F> 3a(F), which were considered as observed and used for all calculations (program system SHELX76; Sheldrick, 1976).

A Dicyanoargentate(I) Rod Behaving as a Discrete Anion, a Monodentate Shaft or Shank, and an Ambidentate Shaft in the Crystal Structures of Imidazole-Blade Ligated Cadmium(II) Dicyanoargentate(I) Complexes: trans-Bis[dicyanoargentato(I)]tetrakis(imidazole)cadmium(II), [Dicyanoargentato(I)]pentakis(imidazole)cadmium(II) Dicyanoargentate(I), catena-Poly[tetrakis(N-methylimidazole)cadmium(II)-trans-μ-dicyanoargentato(I)] Dicyanoargentate(I), and catena-Poly[tetrakis(2-methy

“…The layers of discrete [Ag(CN) 2 ] - anions and the respective Cd complex cations are alternately stacked along the c axis in the structures of 1b , 2 , and 3 ; 1a also has the analogous layered array of the propellers stacked along both b and c axes. The layered crystal structure involving dicyanoargentate(I) appears to be rather common even for a single complex salt such as Na[Ag(CN) 2 ] or K 2 Na[Ag(CN) 2 ] 3 …”

Crystal Structure, Electronic Structure, and Temperature-Dependent Raman Spectra of Tl[Ag(CN)2]: Evidence for Ligand-Unsupported Argentophilic Interactions

“…The shortest Ag−Ag distance of 3.11 Å observed in Tl[Ag(CN) 2 ] is shorter than any reported Ag−Ag distance among the silver dicyanide salts whose crystal structures have been determined. For example, the shortest silver−silver distance has been reported as 3.71 and 3.52 Å in Na[Ag(CN) 2 ] and K 2 Na[Ag(CN) 2 ] 3 , respectively. Crystal structures have also been determined for K[Ag(CN) 2 ], M[Ag(CN) 2 ] 2 ·2H 2 O (M = Ca, Sr), and Rb{Cd[Ag(CN) 2 ] 3 } …”

Mono‐ and penta‐nuclear self‐assembled silver(I) complexes of pyrazolyl s‐triazine ligand; synthesis, structure and antimicrobial studies

“…The N8–Ag1–O1 angle of 167.60(9)° is close to a linear arrangement of the two ligand atoms as it occurs, e.g. in the [Ag(NH 3 ) 2 ] + or [Ag(CN) 2 ]¯ ions . The coordination sphere of Ag1 is augmented by two weak bonds; the N2 atom of the triazine ring system is found at a distance of 2.651(3) Å to the central silver atom and a second oxygen atom of the nitrate group also contributes to the coordination sphere by forming a weak Ag1–O2 bond with a length of 2.680(3) Å.…”