Metal complexes of mercaptoamines—I. Synthesis and crystal and molecular structure of tetrakis (3-amino-1-propanethiolato) trinickel(II)chloride

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)

“…[15] The AB peaks in 2a and 2b were observed at higher energy levels compared with those in the corresponding Co III and Ni II complexes. It is therefore concluded that the addition of another methylene group to the chelate ring in octahedral trinuclear complexes does not cause important modifications in the chromophores, and the structures are very similar in both cases.…”

“…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.…”

“…Complex 1 was obtained more easily and in a purer form than the complexes 2 ], which were obtained under more drastic conditions. [15] Scheme 3.…”

“…[14] Similarly, [Ni(apt) 2 2+ . [15] The solubility of complexes with six-membered chelate rings, e.g. [Ni{Ni(apt) 2 2+ .…”

“…The electronic properties are also influenced by the additional methylene group, which could be explained in terms of different bond lengths and angles of the chromophores in these complexes. [15] It has been well explained in the literature that the variations in the bridging ligands provide remarkable control over the electronic structures and photophysics of complexes. In one of the reports it was found that bpa dimers [bpa = 1,2-bis(4-pyridyl)ethane] exhibit a broad, low-energy emission from a metal-centered 3 LF excited state, whereas the bpe and bpy dimers [bpe = trans-1,2-bis(4-pyridyl)ethylene, bpy = 4,4Ј-bipyridyl] exhibit structured emission from the lowest pyridyl-centered 3(π-π*) excited state.…”