Effect of the capping ligand on luminescent erbium(iii) β-diketonate single-ion magnetsElectronic supplementary information (ESI) available: Differential scanning calorimetry (DSC), FTIR, Raman, additional PL emission intensities comparisons, lifetime measurements, DC and AC magnetic data are provided. Atomic coordinates, thermal parameters and bond lengths and angles have been deposited at the Cambridge Crystallographic Data Centre (CCDC). Any request to the CCDC for this material should quote

• Main Authors: Silva, M. Ramos, Martín-Ramos, P, Coutinho, J. T, Pereira, L. C. J, Martín-Gil, J
• Format: Article
• Language: English
• ISSN: 1477-9226; 1477-9234
• DOI: 10.1039/c4dt00168k

Erbium complexes featuring β-diketonate ligand 2,4-hexanedione (Hh) and N,N-donor-ligands 2,2′-bipyridine (bipy), 5-nitro-1,10-phenanthroline (5NO 2 phen) and bathophenanthroline (bath) have been synthesized. The structures of the ternary complexes [Er(h) 3 (bipy)], [Er(h) 3 (5NO 2 phen)] and [Er(h) 3 (bath)] have been determined by single crystal X-ray diffraction. Excitation of the complexes in the ultraviolet region (337 nm) led to near infrared (NIR) luminescence at 1532 nm characteristic of the trivalent erbium ion in the three compounds, with an improved antenna effect in the 5-nitro-1,10-phenanthroline complex. The AC susceptibility studies conducted at frequencies ranging from 33 to 9995 Hz and at temperatures in the 1.7 to 10 K range revealed that the application of a static magnetic field induces a slow magnetic relaxation in all three compounds. The complex with the bulkier capping ligand (bathophenanthroline) exhibits the highest energy barrier U / k B = 23 K. Three Erbium complexes with 2,4-hexanedione and different N,N-donor ancillary ligands have been synthesized and characterized. The impact of the diimide ligand on SIM behaviour has been assessed.