Trigonal Bipyramidal Metalselenide Clusters with Palladium and Tin Atoms in Various Positions

The reaction of [(R1Sn)3Se4Cl] (R1 = CMe2CH2COMe) with [Pd(PPh3)2Cl2], (SiMe3)2Se, and hydrazine hydrate yields a new Pd/Se cluster, [Pd3(PPh3)5(SeH)(μ3-Se)2][SnCl3] (1). Using [(R1Sn)4Se6] as reactant and varying the reaction conditions as well as the addition of (SiMe3)2Se and hydrazine hydrate, [Pd3(PPh3)5(SnCl3)(μ3-Se)2][SnCl3] (2) and [Pd2(PPh3)3Cl{SnR2Cl2}(μ3-Se)2] (3) can be isolated. 3 is the first compound based on a [Pd2SnSe2] moiety, which furthermore exhibits a functional organic group at the tin atom. Its photoluminescence and absorption spectra are discussed as well. All compounds were characterized by single-crystal X-ray diffraction, indicating a bipyramidal structure. Mass spectrometric analyses of the reaction solutions provide some insight into the formation of the clusters.