| dc.description |
The salts of the monosubstituted hexanuclear anions [Ir6(CO)14X]<sup>â </sup>[X = Cl (1), Br (2), I (3), or SCN (4)] have been prepared by treating [Ir6(CO)16] with halides or pseudohalides at room temperature in tetrahydrofuran solution. Complex (2) crystallizes in the monoclinic space group P21/c(no. 14) with a= 12.653(4), b= 25.566(10), c= 13.351(2)à , β= 91.04(2)°, and Z= 4, (3) crystallizes in the monoclinic space group P21/c(no. 14) with a= 17.444(3), b= 14.791(3), c= 23.332(5)à , β= 113.32(2)°, and Z= 4, and (4) crystallizes in the monoclinic space group P21(no. 4) with a= 9.441(3), b= 36.952(9), c= 15.663(4)à , β= 91.44(2)°, and Z= 4. The three structures have been solved by conventional Patterson and Fourier methods and refined by full-matrix least-squares to final conventional R values of 0.029 (2), 0.036 (3) and 0.045 (4) on the basis of 4 223, 5 427, and 7 181 independent counter data having I > 3Ï (I). The three anions consist of slightly distorted octahedra of iridium atoms bearing twelve terminal and two edge-bridging carbon monoxide groups. In all cases the halogen atoms or the pseudohalogen group adopt a bridging co-ordination on an Irâ Ir edge. |
