Cobalt(III) complexes with aminothiolates

Synthesis of Novel S‐Bridged Heterotrinuclear Complexes Containing Six‐Membered Chelate Rings: Structural, Spectroscopic, and Electrochemical Properties of [Co{Rh(apt)3}2]3+ (apt = 3‐Aminopropanethiolate)

“…Only a few Co III , Ni II , Zn II , Cd II , Hg II , and Fe III complexes have been reported. [14,15,20,21] The polynuclear complexes obtained were homopolynuclear complexes only, and to the best of our knowledge, there is no report of heteropolynuclear complexes. The choice of apt is based on the simplicity of the ligand and the fact that the ligand had been poorly studied.…”

“…The same trend is observed in the case of Co II , Ni II , Zn II , Cd II , and Hg II complexes with apt. [14,15,20,21] The similarity between the IR spectral patterns of 1 and those of the trinuclear 2a(NO 3 ) 3 and 2bBr 3 shows that the terminal units retain their structure during the formation of S-bridged complexes. The absence of bands in the range 2550-2600 cm -1 (υS-H) is characteristic of coordinated sulfur.…”

“…[14,15,20,21] Therefore, to the best of our knowledge, this is the first report on the electrochemistry of S-bridged complexes containing apt. Each of the voltammograms displays a quasi-reversible redox couple in the negative potential region.…”

“…This is different from the case of the Co III complexes in which [Co{Co(aet) 3 } 2 ]Cl 3 gave both meso and racemic forms while [Co{Co(apt) 3 } 2 ]Cl 3 gave only the meso form. [14,21] …”

“…For example, an additional methylene group led to differences in reactivity: all the attempts to synthesize [Co(apt) 3 ] (apt = 3-aminopropanethiolate) were unsuccessful, unlike the corresponding complex [Co(aet) 3 ], which was obtained easily. [14] Similarly, [Ni(apt) 2 2+ . [15] The solubility of complexes with six-membered chelate rings, e.g.…”