Two forms of the new compound Pd(py)4I6 have been prepared by the reaction of stoichiometric amounts of PdCl2, C5H5N, KI and I2 in water. One modification crystallizes triclinically in space group Ρ1̄ with a = 907.7(3), b = 960.5(7), c = 992.0(4) pm, α = 117.31 (4), β = 103.35(3), γ = 86.01(5)° and Z = 1, the other orthorhombically in space group Pnnm with a = 891.6(4), b = 1047.6(4), c = 1659.1(5) pm and Z = 2. Both structures may be described as layerlike packings of I3 - anions and [Pd(py)4]2+ cations. Differences arise from the orientations of the anions and cations within these layers. The new compond Pd(py)2l6 has been prepared by recrystallisation of Pd(py)4I6 from chloroform. It crystallizes in the monoclinic space group I2/a with a = 1801.1(4), b = 584.0(1), c = 2220.5(6) pm, β = 115.78(2)° and Z = 2. The structure is built up from quasi square planar complexes [Pd(py)2l2] and iodine molecules I2 linked together to give alternating screw- and zigzag-shaped chains ^[I_-I2] along [1 0 01 forming nets of type (10, 3) including the Pd2+ ions. The structure may also be described as a layerlike packing of the anionic chains 1 ∞[I- · I2] and linear complex cations [Pd(py)2]2+ parallel [0 1 1].
No takes yet. Share an insight, caveat, or question.
Tebbe et al. (1996) studied this question.