New neutral and anionic thiocyanate complexes of Y(III) and Eu(III) with 2,2′-bipyridine and 1,10-phenanthroline: Synthesis, structures, thermal behavior and photophysical properties

摘要: Abstract Neutral complexes [M(NCS)3(H2O)(bpy)2]·0.5(bpy)·H2O, [M(NCS)3(H2O)(phen)2]·phen·0.5H2O and anionic [Hbpy][M(NCS)4(bpy)2]·H2O, [Hphen][M(NCS)4(phen)2] with M(III) = Y, Eu have been synthesized. In each pair, the yttrium europium are isostructural metal coordination number (CN) is 8. The thermal behavior of compounds was studied in an inert atmosphere range 30–500 °C. stability determined by solvate molecules. Anionic without molecules stable up to 250 °C. solvates phen, elimination coordinated water accompanied transition phen from outer-sphere inner-sphere at 170–220 °C. magnetic photoluminescent properties determined. absence intermediate obtained neutral complex increases luminescence lifetime 5D0 level internal quantum yield, which ranges 9 30%. A study photoluminescence [Hphen][EuxY1−x(NCS)4(phen)2] solid solutions has shown that dilution decreases radiationless deactivation level.