Two dinuclear complexes with novel coordination type, [Cu 2 (DPDIDT) 2 ](PF 6 ) 2 (1) and [Ag 2 (DPDIDT) 2 ]-(BF 4 ) 2 (2), plus a dinuclear complex of the usual coordination type, {Re(Cl)(CO) 3 } 2 (DPDIDT) (3) as a comparative complex were prepared from bis-(4-(2-pyridylmethyleneiminophenyl))disulfide (DPDIDT) and the relevant metal sources. Complexes (1) and (2) exist in solution as dimer structures of the square-pole type according to the interpretation of the ESI mass and 1 H NMR spectra. The density functional theory calculations for the monomer and dimer models of the Cu(I) complex cations, [Cu n (DPDIDT) n ] n? (n = 1, 2), demonstrated that the dimer form is structurally more stable than the monomer form. The UV-Vis absorption spectra of complexes (1) and (3) both exhibit a typical MLCT absorption band in the 400-700 nm region. The Re(I) complex (3) was revealed to possess a facial configuration with respect to the three carbonyl ligands by 1 H NMR and IR data.
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