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The treatment of [B 6 H 6 ] 2-  with an excess of (SCN) 2  in dichloromethane in the presence of solid KOH gives the hexaisoselenocyanatodiborate anion [B 2 (NCSe) 6 ] 2-  as an intermediate (δ( 11 B) = -10.3 ppm), from which [BH(NCSe) 3 ] -  and elemental selenium are formed. The X-ray structure determinations on single crystals of (n-Bu 4 N) 2 [BH(NCSe) 3 ] (1) (triclinic, space group Pi with a = 8.512(2), b = 10.885(3), c = 14.895(4) Å, α = 79.52(2), β = 74.86(2), γ = 86.768(2)°, Z = 2) and (Ph 4 P)[B 3 H 7 (NCSe)] (2) (monoclinic, space group C2, a = 7.686(5), b = 10.366(3), c = 17.533(3) A, β = 108.89°, Z = 4) show that the selenocyanate groups are coordinated exclusively via the N atoms with average bond lengths of B-N = 1.52, C-N = 1.15, C-Se = 1.75 A and angles N-C-Se = 179°, B-N-C = 168.7 - 176.8°. The N-B-N angles of 1 range from 107.5 to 109.5°.

zeitschrift für naturforschung b

Isoselenocyanatoborate -Kristallstrukturen von (n-Bu 4 N)[BH(NCSe) 3 ] und (Ph 4 P)[B 3 H 7 (NCSe)] / Isoselenocyanatoborates -Crystal Structures of (n-Bu 4 N)[BH(NCSe) 3 ] and (Ph 4 P)[B 3 H 7 (NCSe)]