Nucleophilicity of the selenide ligands in [Pt2(μ-Se)2(PPh3)4]. Molecular assembly of a novel {In2Pt4Se6} core

Lewis basic Pt2(μ-Se)2(PPh3)4 reacts with In(ClO4)3 to give a rare platinum–indium selenido aggregate, {[Pt2(μ3-Se2)2(PPh3)4]2In2(μ-Se)2}{ClO4}2. Single-crystal X-ray diffraction analysis revealed a hexametallic framework supported by a planar {In2Se2} square sandwiched by two {Pt2Se2} hinged butterfly moieties. This structure resembles that of the semiconducting anion [(Ga6Se14)10−] by having a common double-tetrahedra {M2Se6} core. The planar {M2Se2} ring also exists in other semiconductors like In4Se3 and TlSe.