The conformational arrangement effect of luminescent Eu(III) coordination polymers with phenylene diamide units on structural and photophysical properties

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Luminescent Eu(III) coordination polymers with phosphine oxide linker ligands that contain phenylenediamide units [Eu(hfa)3p-dpba]n, [Eu(hfa)3dppt]n, and [Eu(hfa)3dppb]n (hfa: hexafluoroacetylacetonate, p-dpba: N,N′-(1,4-phenylene)bis(4-(diphenylphosphoryl)benzamide, dppt: N1,N4-bis(4-(diphenylphosphoryl)phenyl)terephthalamide, dppb: 4-(diphenylphosphoryl)-N-(4-((4-(diphenylphosphoryl)phenyl)carbamoyl)phenyl)benzamide) were reported. The structural and photophysical properties of the Eu(III) coordination polymers were evaluated. The phase-transition temperatures of [Eu(hfa)3p-dpba]n, [Eu(hfa)3dppt]n, and [Eu(hfa)3dppb]n were determined to be 153, 148, and 79 °C, respectively. The overall emission quantum yield (Φππ*) and photosensitized efficiency (ηsens) excitation of [Eu(hfa)3dppt]n (Φππ* = 19%, ηsens = 43%) and [Eu(hfa)3dppb]n (Φππ* = 19%, ηsens = 37%) under 370 nm of excitation were found to be larger than those of [Eu(hfa)3p-dpba]n (Φππ* = 4.4%, ηsens = 6.8%). We demonstrate systematic evaluation of the structural and photophysical properties of the amide units.