[Pb_2I_3(18-crown-6)_2][SnI_5] and CdI_2(18-crown-6)·2I_2: Two layered iodine networks with crown-ether coordinated Pb~(2+) and Cd~(2+)

摘要

[Pb_2I_3(18-crown-6)_2][SnI_5] (1) and CdI2(18-crown-6) 2I_2 (2) were prepared by reaction of PbI _2, SnI_4 and 18-crown-6 as well as CdI_2, I _2 and 18-crown-6. All reactions were performed in the ionic liquid [NMe(nBu)_3][N(Tf)_2], which serves as polar but aprotic liquidphase providing a fast diffusion of the reactants at moderate tempera- tures (≤ 100 °C). 1 exhibits V-shaped [Pb_2I _3(18-crown-6)_2]~+ cations and trigonal-bipyramidal [SnI_5]- anions. In CdI_2(18-crown-6) 2I_2 (2), the building unit CdI_2(18-crown-6) formally contains linear CdI_2 molecules that are interlinked by molecular iodine via long-ranging I-I contacts.