Manganese(ii) bromo- and iodo-complexes with phosphoramidate and phosphonate ligands: synthesis, characterization and photoluminescence

Abstract

Tetrahedral Mn(II) bromo- and iodo-complexes with phosphoramidate and phosphonate ligands were synthesized and characterized. Mononuclear complexes with the general formula [MnX₂L₂] were isolated by using the monodentate ligands OP(OPh)₂(NMe₂) and OP(OPh)₂Ph. The bidentate resorcinol derivative 1,3-OP(NMe₂)O–C₆H₄–O(NMe₂)₂PO behaved as a bridging ligand, and afforded, by reaction with MnX₂ salts, a dinuclear complex in the case of X = Br and a coordination polymer for X = I, as revealed by single crystal X-ray diffraction. All the compounds showed the characteristic green photoluminescence of Mn(II) in a tetrahedral environment. The resulting lifetime values were influenced by the symmetry of the compounds. The complexes with OP(OPh)₂(NMe₂) in the coordination sphere showed high photoluminescence quantum yields.