| Abstract: | d, h-μ-Benzylalkoxophosphonato-e-μ-alkoxo-f-μ-oxo-bis[trichloroantimony(V)] Compounds The binuclear antimony(V) complexes Cl3Sb(O)[R3(R1O)PO2](OR2)SbCl3 1 – 6 with R1 = R2 = CH3, C2H5 and R3 = C6H5CH2, (CH3)3C6H2CH2 in solution slowly exchanges the R2 groups between the oxygen atoms of the Sb2O2 ring. The SbOPOSb ringsystem makes rapid pseudorotation. The isomeres are detected by nmr spectroscopy. 1 (R1 = R2 = CH3) crystallizes in the orthorhombic space group Pnma with a = 1247.0, b = 1324.1, c = 1207.9 pm and Z = 4. 2 (R1 = CH3, R2 = C2H5) and 5 (R1 = R2 = CH3, R3 = (CH3)3 · C6H2CH2) crystallizes triclinic in the space group P-1 with a = 984.1, b = 1026.7, c = 1079.9 pm, α = 87.93, β = 75.70, γ = 87.62° and Z = 2 and a = 1164.6, b = 1296.9, c = 1712.9 pm, α = 109.9, β = 96.3, γ = 100.2° and Z = 4 resp., with two crystallographically independent molecules in the asymmetric unit. |
