Reactivity of the [CpM(PPh3)2]+ (M=Ru, Os) fragment with diethyldithiocarbamate

Exploring Rhenium Arene Piano-Stool Chemistry with [Re(η6-C6H6)(NCCH3)3]+: A Powerful Semi-Solvated Precursor

Thermal treatment of the Re^III hydride complex [ReH(η⁵-C₆H₇)(η⁶-C₆H₆)]⁺ in CH₃CN results in the formation of [Re(η⁶-C₆H₆)(NCCH₃)₃]⁺. This semi-solvated complex is remarkably stable under an ambient atmosphere and exhibits a fast CH₃CN self-exchange, which facilitates substitution reactions. The CH₃CN ligands are replaced by σ-donating phosphines such as trimethyl phosphine (PMe₃), triphenyl phosphine (PPh₃), or the bidentate 1,2-bis(diphenylphosphino)ethane (dppe) to afford [Re(η⁶-C₆H₆)(NCCH₃)_3-x(PR₃)_x]⁺ (if R = Me, then x = 2; if R = Ph, then x = 1 or 2) or [Re(η⁶-C₆H₆)(dppe)(NCCH₃)]⁺, respectively. [Re(η⁶-C₆H₆)(NCCH₃)₃]⁺ also reacts with π-acceptors such as 2,2'-bipyridine (bipy), 1,10-phenanthroline (phen), or CO (1 atm) to give [Re(η⁶-C₆H₆)(L)(NCCH₃)]⁺ (L = bipy or phen) and [Re(η⁶-C₆H₆)(CO)(NCCH₃)₂]⁺, respectively. The latter does not show any signs of decomposition after being exposed to an ambient atmosphere for multiple days. Additionally, [Re(η⁶-C₆H₆)(NCCH₃)₃]⁺ reacts with π-donors such as the dienes 2,3-dimethyl-1,3-butadiene (DMBD), norbornadiene (NBD), or 1,5-cyclooctadiene (COD) to give [Re(η⁶-C₆H₆)(η⁴-diene)(NCCH₃)]⁺ (diene = DMBD, NBD, and COD). All three complexes are extremely stable and do not decompose during purification by preparative high-performance liquid chromatography (aqueous acidic gradient). In the presence of 18-crown-6, [Re(η⁶-C₆H₆)(NCCH₃)₃]⁺ reacts with lithium cyclopentadienyl to give the sandwich complex [Re(η⁵-C₅H₅)(η⁶-C₆H₆)]. Loss of the coordinated benzene was observed when treating [Re(η⁶-C₆H₆)(NCCH₃)₃]⁺ with diphenylacetylene (PhC≡CPh), yielding the tetra-coordinated [Re(NCCH₃)(η²-PhC≡CPh)₃]⁺.

Dithiocarbamate Complexes of Platinum Group Metals: Structural Aspects and Applications

The incorporation of dithiocarbamate ligands in the preparation of metal complexes is largely prompted by the versatility of this molecule. Fascinating coordination chemistry can be obtained from the study of such metal complexes ranging from their preparation, the solid-state properties, solution behavior as well as their applications as bioactive materials and luminescent compounds, to name a few. In this overview, the dithiocarbamate complexes of platinum-group elements form the focus of the discussion. The structural aspects of these complexes will be discussed based upon the intriguing findings obtained from their solid- (crystallographic) and solution-state (NMR) studies. At the end of this review, the applications of platinum-group metal complexes will be discussed.