Manganese complexes with S2CPEt3 ligands. X-Ray crystal structures of cis-trans-[Mn(CO)2(PEt3)2(S2CPEt3)]ClO4 and cis-trans-[Mn(CO)2(PEt3)2(S2CH)]

Abstract

A variety of manganese(I) carbonyl complexes containing triethylphosphine and monodentate or chelate triethylphosphoniodithiocarboxylato ligands can be obtained by substitution reactions either under mild conditions or by thermal or photochemical methods. The products resulting from the thermal reactions between bromo carbonyls and S₂CPEt₃ are very different from those obtained with S₂CP(C₆H₁₁)₃ under similar conditions, and this can be attributed to the difference in electronic and steric properties of the phosphines concerned. The X-ray structure of cis,trans-[Mn(CO)₂(PEt₃)₂(S₂CPEt₃)]ClO₄ has been determined. Reduction of this compound with NaBH₄ affords the neutral dithioformate complex cis,trans-[Mn(CO)₂(PEt₃)₂(S₂CH)] which has been characterized by spectroscopic methods and by X-ray crystallography.