the divalent chromium analogue. The reaction afforded in the case of both a and b the two nearly isostructural divalent complexes [CySCH2Si(CH3)2NSi(CH3)2CH2SCy]Cr(μ-Cl)}2 (4a) and [(t-Bu)SCH2Si(CH3)2NSi(CH3)2CH2S(t-Bu)]Cr(μ-Cl)}2 (4b) in crystalline form. To further clarify the interaction of 4 with aluminate species, we have carried out in situcomplexation in the presence of either AlCl3 or AlMe3