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Synthesis, characterisation and structural investigations of iodine-doped indium(III) and zirconium(IV) diphthalocyanines: [InPc2]I2and [ZrPc2]I2

Inorganica Chimica Acta
Publication Date
DOI: 10.1016/s0020-1693(01)00627-2
  • Indium(Iii) And Zirconium(Iv) Diphthalocyanine
  • Sandwich-Type Metallodiphthalocyanine
  • Epr Spectroscopy
  • Raman Spectroscopy
  • Electronic Spectra
  • Conductivity


Abstract Crystals of iodine-doped indium(III) and zirconium(IV) diphthalocyanines, [InPc 2]I 2 and [ZrPc 2]I 2, were grown directly in the reaction of In–Tl alloy or zirconium powder with 1,2-dicyanobenzene under a stream of iodine at about 200 °C. Both partially oxidised diphthalocyaninato complexes crystallise in the P4/ mcc space group of the tetragonal system with one molecule per unit cell. The space group of P4/ mcc requires that the central metal ions are disordered in these structures. The crystal structures shown columnar pseudo-one-dimensional stacks of [InPc 2] or [ZrPc 2] units with a non-integral charge and linear chains of symmetrical triiodide I 3 − ions, which were detected by a Raman spectroscopy. The pseudo-one-dimensional aggregates of [InPc 2] 2/3+ or [ZrPc 2] 2/3+ as well as the chains of I 3 − ions are aligned along the [001] direction. The formal oxidation state of the Pc macrorings equals to ≅−1.167 and ≅−1.667 in indium(III) and zirconium(IV) diphthalocyaninato complexes. The EPR measurement shows a single sharp EPR line at g=2.0028 and 2.0026 for the indium and zirconium complexes, respectively. The conductivity measurement on polycrystalline samples at room temperature equals 2.7–3.1×10 −2 and 5.2–5.5×10 −2 Ω −1 cm −1 for [InPc 2]I 2 and [ZrPc 2]I 2, respectively. The charge transport proceeds mainly along the pseudo-one-dimensional [MPc 2] 2/3+ aggregates. Both iodine-doped metallodiphthalocyaninato complexes exhibit non-metallic character in conductivity (d σ/d T>0).

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