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Iodoplumbate complexes were obtained by reaction of PbI2 with sodium iodide in polar organic solvents and precipitation with large cations. With diammonium cations R3N(CH2)nNR32+ a series of polynuclear iodoplumbates could be isolated and characterized by single crystal X-ray diffraction. While Bu3N(CH2)4NBu32Pb3I10 1, Bu3N(CH2)4NBu34Pb7I22 2 and Bu3N(CH2)4NBu34Pb10I28 3 contain discrete anions, the iodoplumbates Me3N(CH2)5NMe32Pb3I10 4 and Pr3N(CH2)5NPr32Pb7I18 5 consist of one-dimensional and two-dimensional co-ordination polymers, respectively. The Pb3I104– anion in 1 can be regarded as a building block for the structures of 2, 4, 5 and, slightly modified, of 3. In spite of their related structures and similar compositions, these complexes are formed selectively and in good yield under appropriate reaction and crystallization conditions.
Krautscheid et al. (1999) studied this question.