Unique Octaiodide Configuration in Congested Macrocyclic Ligand Complexes

Alan John Jircitano, Mitchell C. Colton, Kristin Bowman Mertes

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The crystal and molecular structures of the iodine reaction products of complexes of palladium(II) and platinum(II) with the tetraaza macrocyclic ligand tetrabenzo[b.f,j,n] [1,5,9,13]tetraazacyclohexadecine have been determined. The complexes analyze for 8 I/macrocycle, exhibit thermal stability up to 180 °C, and are isomorphous, crystallizing in the space group P2Jn. Unit cell dimensions for the palladium complex are a = 7.756 (7) Å, b = 29.86 (3) Å, c = 17.64 (3) Å, and β = 112.9 (1)°, and those for the platinum analogue are a = 7.771 (7) Å, b - 29.95 (7) Å, c = 17.67 (5) Å, and β = 113.2 (2)° with Z = 4. Within the macrocyclic cation the immediate coordination sphere of the metal is nearly planar; however, the overall geometry of the macrocyclic complex conforms to a hyperbolic paraboloid with cavities of 2.68 A about the axial metal sites. The anion consists of discrete Z-shaped nonplanar chains of I82-, each I82- composed of two I3- units weakly associated with an elongated I2.

Original languageEnglish (US)
Pages (from-to)890-896
Number of pages7
JournalInorganic Chemistry
Issue number3
StatePublished - Jan 1 1981

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry


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