Metal Complexes Containing Homoleptic Diorganoselenium(II) Ligands: Synthesis, Characterization and Investigation of Optical Properties

• Published in: Molecules (Basel, Switzerland) Switzerland), 2024-02, Vol.29 (4), p.792
• Main Authors: Dumitraș, Darius, Gal, Emese, Silvestru, Cristian, Pop, Alexandra
• Format: Article
• Language: English
• Subjects: Chemistry; Fluorescence; homoleptic diorganoselenium(II) proligands; Investigations; Ligands; metal complexes; Optical properties; oxazolone; Selenium; Silver; solution behavior; supramolecular interactions; X-ray structures
• ISSN: 1420-3049; 1420-3049
• DOI: 10.3390/molecules29040792

[( )-2'-{ -C H -(4 )-oxazol-5-one}CHC H ] Se ( , L ) and [( )-4'-{2-C H -(4 )-oxazol-5-one}CHC H ] Se ( , L ) were prepared, structurally characterized and used as ligands to obtain new metal complexes of types [MX(L )] [L : M = Ag, X = OTf ( ); M = Au, X = Cl ( ); L : M = Ag, X = OTf ( ); M = Au, X = Cl ( )], [(MX) (L )] [M = Ag, X = OTf, L ( ); L ( )], [ZnCl (L )] [L ( ); L ( )] and [Ag(L )][PF ] [L ( ); L ( )]. The silver complexes and were ionic species (1:1 electrolytes) in a MeCN solution, while in the solid state, the triflate fragments were bonded to the silver cations. Similarly, the 2:1 complexes and were found to behave as 1:2 electrolytes in a MeCN solution, but single-crystal X-ray diffraction demonstrated that compound showed the formation of a dimer in the solid state: a tetranuclear [Ag(OTf)] built through bridging triflate ligands was coordinated by two bridging organoselenium ligands through the nitrogen from the oxazolone ring and the selenium atoms in a 1κN:2κSe fashion. Supramolecular architectures supported by intermolecular C-H∙∙∙π, C-H∙∙∙O, Cl∙∙∙H and F∙∙∙H interactions were observed in compounds , and . The compounds exhibited similar photophysical properties, with a bathochromic shift in the UV-Vis spectra caused by the position of the oxazolone ring on the phenyl ring attached to the selenium atoms.