Congratulations to our PhD student Marco Bazi for the recent scientific publication entitled “Heteronuclear Eu2Pt2 luminescent arrays: composition–thermometric properties correlations”. Lanthanide dinuclear complex [Ln2(tta)6(pyrzMO)2] (Ln: Eu, Gd) can behave as ligands for the synthesis of molecular heterometallic complexes.
Fast reactions at room temperature occur with [PtCl(µ-Cl)EPh3]2 (E: P, As) leading to the formation of the heterometallic complex [Ln2(tta)6(pyrzMO)2(PtCl2EPh3)]2 (Ln: Eu, Gd; E: P, As) as a single product. Similarly, [Ln2(tta)6(pyrzMO)2(PtClppy)]2 (Ln: Eu, Gd) can be obtained by reacting [PtClppy(pyrzMO)] with the unsaturated lanthanide fragment [Ln(tta)3] (Ln: Eu, Gd).
XRD studies on all the heterometallic products have established a tetranuclear Ln2Pt2 structure where platinum is coordinated to the pyridine moiety of pyrzMO while the N-oxide group is bridging two lanthanide centres as in [Ln2(tta)6(pyrzMO)2] PL and thermometric properties of Eu3+ ion are strongly correlated to the nature of the platinum fragment. Luminescence of [Eu2(tta)6(pyrzMO)2(PtCl2EPh3)]2 (E: P, As) is much brighter than [Eu2(tta)6(pyrzMO)2(PtClppy)]2. Temperature-induced variations in emission intensity have been exploited to develop a series of luminescence thermometers where 5D0⇒7F2 europium transition can be used as thermometric parameter. The relative thermal sensitivity (Sr) reaches the value of 1 at 200 K for [Eu2(tta)6(pyrzMO)2(PtCl2EPh3)]2 (E: P, As) and at 100 K for [Eu2(tta)6(pyrzMO)2(PtClppy)]2.
The paper is available at the following link: https://doi.org/10.1039/D5QI00893J
