The First Perselenoborate with a Novel Three-Dimensional Anion Network

A Spirocyclic Borate and a Dihydroborate Derived from the 1,2‐Diselenolato‐1,2‐dicarba‐closo‐dodecaborane(12) Dianion [1,2‐(1,2‐C2B10H10)Se2]2–: Structures, NMR Spectroscopy, and DFT Calculations

“…Some examples with BSe 4 structures are known from solid-state chemistry. [19] The structural data (Table 3) of the carborane moiety and of the C 2 Se 2 B rings are similar to those found previously for A [10] and they are similar to those reported for B, although the standard deviations in the latter are fairly large. [8] To the best of our knowledge, the borate anion 9 is the first example of this type of borate that has been structurally characterized.…”

“…Although the latter are well known in the chemistry of boron-oxygen compounds, [16,17] well-characterized examples for sulfur [18] or selenium [19] are scarce. The products observed here were characterized by NMR spectroscopy, in two cases by X-ray structural analysis, and gas-phase geometries were optimized by DFT methods, which also served for the calculation of NMR spectroscopic parameters (chemical shits and spin-spin coupling constants).…”

“Homoleptic” Tetracoordinate Boron Compounds

“…A new inorganic compound, Li 2 B 2 Se 5 , was prepared and reported by Krebs, in which the central boron connects to four selenium atoms to form a tetrahedral perselenoborate. This work features the first example of a boron–selenium compound containing a 3D anion network structure …”

“…This work features the first example of a boron−selenium compound containing a 3D anion network structure. 95 The dianionic selenium derivative of 1,2-dicarba-closododecaborane(12) has proven to be useful in coordination with transition metal and main-group elements. Although an early work reported the existence of a spiroborate anion in which the central boron coordinates to two molecules of the dianion, the proof was based on only the 11 B NMR spectroscopic signal.…”

Li2TeS3 and Li2TeSe3: Preparation, Crystal Structure and Impedance Spectroscopic Characterization

“…Li1 0.040(1) 0.060(1) 0.034 (7) 0.008 (7) Ϫ0.004 (7) 0.001 (9) [22] with distances d(Li-Se) in the range from 2.54 to 3.38 Å . Usually Li prefers a coordination number of four by Se.…”