Uncommon Coordination Modes of a Potential Heptadentate Aminophenol Donor

Abstract

This work describes the synthesis, characterization and reactivity towards Ho III of a potential heptadentate N4O3 aminophenol donor. The crystal structure of the [Ho(1,1,4-H3L)(1,1,4-H6L)] complex (1,1,4-H6L = 6,6'-(2-(5-bromo-2-hydroxy-3-nitrobenzyl)-2,5,8,11-tetraazadodecane-1,12-diyl)bis(4-bromo-2-nitrophenol)) shows that the holmium atom binds two aminophenol ligands, one acting as trianionic hexadentate, and the other one as neutral monodentate. As far as we know, both coordination modes of the aminophenol are hitherto unknown for this kind of scarcely reported ligand. This leads to coordination number 7 for the Ho III ion, which is in a capped trigonal prism environment.

Harnessing ligand design to develop primary and self-calibrated luminescent thermometers with field-induced single ion magnet behaviour in Dy3+ complexes

“…11 Accordingly, SMMs could function as luminescent thermometers, enabling selfmonitoring of temperature in these nanomaterials. 12,13 Currently, there are several examples of mono-, di-, or homopolynuclear Nd 3+ , 14 Dy 3+ , 12,[15][16][17][18][19][20] Tb 3+ , 21 Ho 3+ , 22 or Yb 3+ complexes, [23][24][25] as well as heteronuclear Yb 3+ Co 3+ , 26,27 Dy 3+ Co 3+ , 28,29 or Dy 3+ Eu 3+ compounds, 30 in addition to some diluted Ln 3+ Y 3+ complexes 31,32 that exhibit both slow relaxation of magnetization and luminescence thermometry (Table 1).…”

“…[Nd(TTA) Therefore, in this work, leveraging our experience in luminescence thermometry of Ln 3+ complexes with slow relaxation of magnetization, 16,17,24,27,28 we investigate the impact of the aliphatic chain as a spacer between the N 3 units of a symmetric hexadentate N 6 ligand on the magnetic and thermometric properties of its Dy 3+ derivatives. Moreover, we investigate the temperature determination using both secondary (requiring previous calibration) and primary (not requiring previous calibration) luminescence thermometry, comparing the performance of both approaches and discussing their ability to accomplish self-calibration of the luminescent thermometers.…”