Die Tetracyanoborate M[B(CN)4], M = [Bu4N]+, Ag+, K+

Application of Ionic Liquids Containing Tricyanomethanide [C(CN)3]− or Tetracyanoborate [B(CN)4]− Anions in Dye-Sensitized Solar Cells

“…21−24 In 1b−4b, the absorptions of the CN group are observed at markedly higher wavenumbers (ca. 2222 cm −1 ) and are significantly shifted from those containing metal cations, which are found in the range of 2250 to 2290 cm −1 , 25−27 but nonetheless are close in value to those observed in tetrabutylammonium 28 Although salts containing the tetracyanoborate anion were reported many years ago, 30 the structure of simple lithium salt was reported only recently, 31 followed by the structures of potassium, 32 sodium, rubidium, cesium, and ammonium salts; 25 several transition metal salts; 26,27 and somewhat more exotic salts. 33 Single crystals of 3b and 4b were obtained by slow cooling from the liquid state from 110°to room temperature over a period of 24 h, and their structures were determined by X-ray diffraction (see the Experimental Section).…”

“…33 Single crystals of 3b and 4b were obtained by slow cooling from the liquid state from 110°to room temperature over a period of 24 h, and their structures were determined by X-ray diffraction (see the Experimental Section). Only very few salts with organic cations (e.g., tetrabutylphosphonium and tetrabutylammonium salts) have been reported, 28,29 and the structures of 3b and 4b (Figure 2) represent the first examples of tetracyanoborate salts containing asymmetric cations.…”

“…32 These values are in the range found in the ammonium and phosphonium salts. 28,29 In the crystal of 3b, the anions are connected by weak hydrogen bonds forming a C−H···N−C− B−C−N···H−C network ( Figure 3). The D···A distances of the C−H···N hydrogen bonds range from 3.40 to 3.53 Å ( Figure 3 and Table 1).…”

Darstellung, spektroskopische Charakterisierung und Kristallstrukturen von Quecksilber(II)-bis(tetracyanoborat) Hg[B(CN)4]2 und Diquecksilber(I)-bis(tetracyanoborat) Hg2[B(CN)4]2Professor Dieter Naumann zum 60. Geburtstag gewidmet

“…Ϫ 1902 (12) 4145 (2) 420 (10) 28(2) C (11) 1142 (19) 2390 (4) Ϫ 2500 22(3) C (12) 1729 (25) 1604 (4) Ϫ 2500 28(3) C (13) Ϫ 1953 (14) 1924 (3) 4245 (11) 21(2) C (21) Ϫ 2702 (20) 5044 (4) Ϫ 2500 21(3) C (22) Ϫ 6293 (21) 4566 (4) Ϫ 2500…”

“…Bemerkenswert ist, daß erst 1995 mit [Hg(tpt) 2 ](ClO 4 ) 2 ·6C 2 H 2 Cl 4 (tpt ϭ 2,4,6-tri(4-pyridyl)-1,3,5-triazin) ein von sechs Stickstoffatomen regulär oktaedrisch umgebenes Hg 2ϩ -Ion beobachtet wurde [12]. Es stellte sich nun die Frage, ob mit dem von uns kürzlich beschriebenen Tetracyanoborat-Anion [13] ebenfalls eine oktaedrische Umgebung für Quecksilber erzielt werden kann.…”