Monometallic europium, terbium, and neodymium complexes formed from the bridging ligand 2,3-bis(2-pyridyl)pyrazine: Crystal structure and temperature dependent luminescent properties

Theoretical Modeling (Sparkle RM1 and PM7) and Crystal Structures of the Luminescent Dinuclear Sm(III) and Eu(III) Complexes of 6,6,7,7,8,8,8- Heptafluoro-2,2-dimethyl-3,5-octanedione and 2,3-Bis(2-pyridyl)pyrazine: Determination of Individual Spectroscopic Parameters for Two Unique Eu3+ Sites

“…Therefore, the europium ions attract the bpp more strongly, resulting in shorter Eu–Eu and Eu–N distances. However, the Eu–O (2.35 Å) and Eu–N (2.62 Å) bond distances for the [Eu­(fod) 3 (μ-bpp)­Eu­(fod) 3 ] complex are longer than the Eu–O (2.33 Å) and Eu–N (2.57 Å) bond distances reported for mononuclear [Eu­(tdh) 3 (bpp)] (tdh is 1,1,1-trifluoro-5,5-dimethyl-2,4-hexanedione). Both Sm 3+ and Eu 3+ complexes are stabilized by the π–π stacking interactions between the two pyridine rings of bpp with interplanar distances of 4.11 Å (Figures b and b).…”

Composition–Thermometric Properties Correlations in Homodinuclear Eu3+ Luminescent Complexes

“…During the past decade the increasing use of noncontact techniques for temperature measurements has led to many research efforts in the design of innovative lanthanide-based luminescent thermometers. − Lanthanide metal–organic frameworks (LOFs) and coordination polymers (CPs), in particular, due to their thermal stability ,− have been extensively explored as luminescent thermometers in a wide temperature range, from ∼600 K down to cryogenic temperatures (<100 K). , Moreover, the thermometric properties of these compounds can be tuned through a selective modification of the different building blocks: e.g., metal ions, spacer ligands, and guest molecules . Less extensive investigations, at variance, have been devoted to the temperature dependence of luminescent properties of discrete lanthanide β-diketonato complexes, − though these compounds, being easily processable, are suitable for the development of functional materials for temperature measurements. − Europium complexes with a β-diketonato triplet energy of around 20.000–25.000 cm –1 , − are suitable for temperature sensing between 223 and 373 K, an interval that covers the physiological window (298–323 K) and the working range of many integrated circuits. ,, The temperature-dependent luminescent properties of these complexes can be easily modulated by changing the lateral substituents on the β-diketonato ligand, as showed in a pioneering work by Sato and Wada . Although intensity-based ratiometric luminescent thermometers have been the most greatly studied, the development of single-emitter (single-transition) thermometers is still very important for fluidodynamic and aerodynamic applications, where luminescent complexes are used in the so-called temperature-sensitive paints (TSPs) to map the surface temperature distributions.…”

Structurally Diverse Polynuclear Copper(I) Complexes Bridged by Pyrimidine–, Pyrazine–, and Triazine–based Ligands with Several 2–Pyridyl Groups

“…The most common types of these modes are five–membered bidentate (ii–a) and bis–bidentate modes (ii–d). Mononuclear bppz complexes of Co(II), Cu(I), Cu(II), Ru(II), Rh(III), Pd(II), Ir(III), Re(I), Pt(II), Pt(IV), and Ln(III) (Ln=Nd, Eu, and Tb) have been reported in coordination mode (ii–a), together with multinuclear and polymeric bppz complexes of Mn(II), Cu(II), Cu(II)/Mo m O n , Re(0), Os(0), Os(I), and Pb(II) containing coordination mode (ii–a). The most likely homometallic dinuclear bppz complexes of Mn(II), Co(II), Ni(II), Cu(II), Ru(II), Re(I), and Pt(II) have been widely known in coordination mode (ii–d), together with multinuclear and polymeric complexes of Cu(I), Cu(II), and Re(0) containing coordination mode (ii–d).…”