Diborylverbindungen als Liganden in Metallkomplexen, III Synthese und Struktur von Bis(2.5-dimethyl-3.4-diäthyl-1.2.5-thiadiborolen)-nickel(0) / Diboryl Compounds as Ligands in Metal Complexes, III Synthesis and Structure of Bis(2,5-dimethyl-3,4-diethyl-1,2,5-thiadiborolene)-nickel(0)

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Abstract
2,5-Dimethyl-3,4-diethyl-1,2,5-thiadiborolene (1) and Ni(CO)4 yield yellow 1 • Ni(CO)2, which is converted to the corresponding bis( 1,2,5-thiadiborolene)-nickel(0), the first thermostable thioborane nickel complex. Spectroscopic data indicate a pentahapto sandwich compound with the electron-donating groups in approximately tetrahedral arrangement. This is confirmed by X-ray structural analysis. The title compound crystallizes in the space group p21/c with α = 19.594(2), b = 11.8593(4), c = 9.3736(3) Å, β = 102.848(6)° and four molecules per unit cell.