Temperature effects on the quenching of the 5D0→7F2 emission of Eu(6,6,7,7,8,8,8-heptafluoro-2,2-dimethyl-3,5-octanedionate)3 by a Cu(ii) macrocycle

Abstract

Luminescence quenching of Eu(fod)3(fod = 6,6,7,7,8,8,8-heptafluoro-2,2-dimethyl-3,5-octanedionate) by a Cu(II) macrocycle was studied at 25, 35 and 45 degrees C by steady-state and flash luminescence techniques, varying the Cu(II) concentration between 0.2 and 20 mM. Experimental variation of the observed rate constant with the quencher concentration is rationalized in terms of a mechanism involving the quenching of two unequilibrated species by the Cu(II) macrocycle.

A Case of Self‐Organization in Highly Emissive EuIII Ionic Liquids

“…The synthesis of ILs 1-3 followed a procedure that was previously published for 1. [10] Elemental analyses are in good agreement with the calculated values for the desired [P 6,6,6,14 Figure 1) show the most important diagnostic bands attributed to the functional groups of the lanthanidediketonate complexes and the organic ligands. The broad band around 3400 cm -1 is attributed to the stretching vibration of the O-H bond and the bending vibrations of H-O-H are from water adsorbed in the samples.…”

“…[3,4] Many Eu III containing ionic liquids show an intense photoluminescence due to the 5 D 0 → 2 F J transitions (J = 0-6) from the 5 D 0 excited state to the J levels of the ground term 7 F J . A sharp decrease in the intensity of the 5 D 0 → 7 F 2 transition with increasing temperature is observed mainly in the liquid state, whilst temperature has only a mar-for [P 6,6,6,14 ][Eu(dbm) 4 ] (3). The luminescence quantum yields determined for 1, 2, and 3 are 34, 59 %, and 64 %, respectively.…”

“…In the present work three new ionic liquids were synthesized by using a tetraalkylphosphonium [P 6,6,6,14 ] + as the counterion of the Eu III tetrakis( -diketonate) complexes. The photoluminescence and thermochemical properties of the complexes were investigated in detail.…”

“…The combination of these aromatic and aliphatic substituents is expected to give complexes with a more intense luminescence and with a lower melting point. A set of three tetrakis -diketonate complexes, referred from here as 1 for [P 6,6,6,14…”

A Reusable Eu3+ Complex for Naked‐Eye Discrimination of Methanol from Ethanol with a Ratiometric Fluorimetric Equilibrium in Methanol/Ethanol Mixtures

“…80°C. [19] The interaction of the acidic [P 6,6,6,14 ] + counterion with the labile oxygen from one FODligand forms an electron delocalized six-membered ring with Eu 3+ with a red/purple color. [19] The interaction of the acidic [P 6,6,6,14 ] + counterion with the labile oxygen from one FODligand forms an electron delocalized six-membered ring with Eu 3+ with a red/purple color.…”