Synthesis, structure and reactivity of [Mn2(CO)6(μ-MBT)2] (MBT = 2-mercaptobenzothiazolato): A versatile precursor for mono- and polynuclear compounds

Chirality-Guided Isomerization of Mn2S2 Diamond Core Complexes: A Mechanistic Study

Occasioned by the discovery of a ligand transfer from M(N₂S₂) to Mn^I in Mn(CO)₅Br, the resulting H₂N₂S₂ ligand-tethered dimanganese complex, (μ₄-N,N'-ethylenebis(mercaptoacetamide))[Mn₂(CO)₆], was found to have myriad analogues of the type (μ-S-E)₂[Mn₂(CO)₆], making up an under-studied class containing Mn₂S₂ rhombs. The attempt to synthesize a nontethered version resulted in a solid-state structure in an anti-conformation. However, a direct comparison of the Fourier-transform infrared spectra of the tethered versus nontethered complexes in combination with theoretical frequency calculation suggested the coexistence of syn- and anti-isomers and their interconversion in solution. Analysis of the syn- versus anti-version of the dimanganese components led to the understanding that whereas the anti-form exists as centrosymmetric RS isomers, the syn-form is restricted by C₂ symmetry to be either RR or SS. Molecular scrambling experiments indicated monomeric, pentacoordinate, 16-e^- (S-O)Mn(CO)₃ intermediates with lifetimes sufficiently long to sample R and S monomers. Density functional theory analysis of the mechanistic pathway and a kinetic study corroborated that the proposed isomerization involves the cleavage and reformation of the dimeric structures.

A simultaneous disulfide bond cleavage, N,S-bialkylation/N-protonation and self-assembly reaction: syntheses, structures and properties of two hybrid iodoargentates with thiazolyl-based heterocycles

Unprecedented multiple in situ reactions were found during preparation of hybrid iodoargentates.

The First Carbonyl-Substituted Derivative of [Mn2(CO)6(µ-pyS)2]

Reaction of [Mn2(CO)6(μ-pyS)2] (1) with (Ph3P)2Ni(CO)2 at room temperature affords [Mn2(CO)5(PPh3)(μ-pyS)2] (3) which is the first carbonyl-substituted derivative of 1. A mononuclear complex fac-[Mn(CO)3(PPh3)(κ2-pyS)] (4) is also isolated as a minor product in this reaction. The formation of 3 allows us to propose a different mechanism operating in this reaction. A similar reaction between [Re2(CO)6(μ-pyS)2] (2) and (Ph3P)2Ni(CO)2 gives only mononuclear fac-[Re(CO)3(PPh3)(κ2-pyS)] (5). Both 4 and 5 undergo CO substitution to produce [M(CO)2(PPh3)2(κ2-pyS)] (6, M = Mn; 7, M = Re) when treated with (Ph3P)2Ni(CO)2 in boiling THF. Complex 3 also reacts with further (Ph3P)2Ni(CO)2 at room temperature to give 4 and 6. The molecular structures of 3 and 4 have been established by single crystal X-ray diffraction analyses.