Dinuclear Ln^III Complexes with 9‐Anthracenecarboxylate Showing Field‐Induced SMM and Visible/NIR Luminescence

Abstract

The reaction of several Ln(NO 3 ) 3 ·6H 2 O salts with 9anthracenecarboxylic acid (9-HAC) and 2,2′-bipyridine (bpy) in a mixture of CH 3 OH/H 2 O has allowed the isolation of the dinuclear compounds 1-6 with formula [Ln 2 (μ 2 -9-AC) 4 (9-AC) 2 (bpy) 2 ] [Ln III = Nd (1), Eu (2), Gd (3), Tb (4), Er (5), and Yb (6)]. The molar magnetic susceptibility measurements of 1-6 in the 2-300 K temperature range indicate weak antiferromagnetic ex- [a]

Using Native Chemical Ligation for Site‐Specific Synthesis of Hetero‐bis‐lanthanide Peptide Conjugates: Application to Ratiometric Visible or Near‐Infrared Detection of Zn2+

“…Upon Zn 2+ binding, the Nd 3+ emission is increased approximately 3‐fold for LZF1 DPP|Nd and 7‐fold for LFZ3 DEAC|Nd , showing that these two peptides can operate as intensiometric probes for Zn 2+ detection in the NIR region. The fifth antenna to be assessed was anthracene, which has already been reported to successfully sensitize Nd 3+ , Yb 3+ , and Er 3+ NIR luminescence in dichloromethane solution or in the solid state . Indeed, with LZF3 Anthra|Nd and LZF3 Anthra|Yb , anthracene was able to sensitize both lanthanides upon excitation in the 330–400 nm spectral range and both peptides show a weak lanthanide luminescence increase upon zinc binding, that is, 1.3 and 1.5‐fold for Nd 3+ and Yb 3+ , respectively (Figure and Figures S13 and S14 in the Supporting Information).…”

“…The fifth antenna to be assessedw as anthracene, which has already been reported to successfully sensitizeN d 3 + ,Y b 3 + ,a nd Er 3 + NIR luminescence in dichloromethane solution or in the solid state. [52,53] Indeed, with LZF3 Anthra j Nd and LZF3 Anthra j Yb ,a nthracene was able to sensitize both lanthanides upon excitation in the 330-400 nm spectral range andb oth peptides show aw eak lanthanide luminescence increase upon zinc binding, that is, 1.3 and 1.5-fold for Nd 3 + and Yb 3 + ,r espectively (Figure 6a nd Figures S13 and S14 in the SupportingI nformation). The quantum yields of Ln 3 + luminescence upon antenna (DPP,D EAC, or Anthra) excitation (TableS1i nt he Supporting Information) are on the same order of magnitude as that of the previously described LZF1 NBD j Nd probe,t hat is, 10 À4 -6 10 À3 %.…”

Exploring the dual functionality of an ytterbium complex for luminescence thermometry and slow magnetic relaxation

“…5C(i)). Assignation of the signals in the considered ranges is not trivial since the emission spectra of Yb III complexes are heavily inuenced by electron-phonon coupling 52,53 (see ESI and Fig. S8 † for additional discussion).…”

Closing the Circle of the Lanthanide-Murexide Series: Single-Molecule Magnet Behavior and Near-Infrared Emission of the NdIII Derivative

“…Nd III luminescence is observed but no magneto-luminescent correlation has been possible. On the contrary, such correlation has been possible on the second example [46] that is a carboxylate-bridged dimer with terminal bipyridine ligands (N 2 O 7 environment, mixed Orbach and Raman-like relaxation with U eff = 8 cm −1 ). The splitting of the lowest five Stark levels of the J = 9/2 state of the 4 I 9/2 level is clearly visible.…”