Detection of Sub‐Terahertz Raman Response and Nonlinear Optical Effects for Luminescent Yb(III) Complexes

Abstract

ULF-Raman) spectroscopy and complementary terahertz time-domain spectroscopy (THz-TDS). [9] Presently, most ULF-Raman research focuses on nanomaterials, revealing the lowest frequency peaks of various origins: ≈20 cm −1 (≈0.60 THz) Au-Au stretching of Au 8 clusters, [10a] 21.4-32.5 cm −1 (0.64-0.97 THz) shear modes of multilayer ME 2 (M = Nb, Mo, W, Re, and Pt; E = S, Se, and Te), [10b] 23-34.5 cm −1 (0.69-1.03 THz) modes of pharmaceutical crystals, [10c] 28 cm −1 (0.84 THz) vibrations of orthorhombic α-S 8 crystals, [10d] 31 cm −1 (0.93 THz) out-of-plane acoustic phonons of multilayer graphene, [10e] 34 cm −1 (1.02 THz) lattice vibrations of highly ordered ferroquine crystals, [10f ] 38 cm −1 (1.14 THz) vibrational motion of lysozyme protein, [10g] 46 cm −1 (1.38 THz) interlayer shear mode of multilayer hexagonal BN, [10h] and 76 cm −1 (2.28 THz) zero-momentum mag-

Development of Nd (III)-Based Terahertz Absorbers Revealing Temperature Dependent Near-Infrared Luminescence

“…Compounds 1-S and 1-Se are the first examples of complexes that exhibit experimentally-proven IR and Raman active modes in the sub-THz region. Moreover, the measured THz-TDS signals are the lowest energy among the materials tested so far, while the lowest energy Raman signals are similar to the values for [Yb III (TPPO) 3 (NCX) 3 ], with the best characteristics among the available LF-Raman active systems ( Table 1 ) [ 47 ]. Interestingly, discrete complexes with pseudohalogens seem to be the universal platform for constructing LF absorbing materials.…”

“…Notably, a limited number of studies on the THz-TDS and LF-Raman spectroscopies of Ln (III)-based assemblies and other transition metal compounds have been conducted [ 47 , 48 , 49 ]. Until now, only one strategy for producing sub-THz absorbing materials has been identified by utilizing heavy alkali metal ions (i.e., Rb + and Cs + ) trapped inside cyanido-bridged coordination polymers [ 21 , 22 , 23 ].…”

Slow magnetic relaxation in Nd(iii) and Sm(iii) complexes formed in three-dimensional lanthanide-dicyanidometallate(i) frameworks exhibiting luminescent properties

“…The experimental plot of Δ( T ) is fitted with the Mott–Seitz model, which is expressed as eqn (2). 66,67 Here, Δ 0 represents the thermometric parameter at 0 K. The ratio of non-radiative ( W 0 at T = 0 K) and radiative ( W R ) rates are given as α 1 and α 2 . The activation energies for the involved non-radiative transitions for two emission peaks are Δ E 1 and Δ E 2 .…”

Luminescence thermometry in a Dy4 single molecule magnet

“…One way to overcome this impasse is to build microdevices with materials capable of also acting as in situ thermometers. In this sense, there are some very recent publications that try to provide solutions for the measurement of temperature in molecular magnets, making use of luminescent thermometry, [7][8][9][10][11][12][13][14][15][16][17] and some of the achievements were summarised by Murugesu and colaborators. 18 Among these works, most studies have been carried out with homodinuclear compounds of Dy III , 7b Tb III , 7c or Yb III .…”

“…Thus, some of us have published the first mononuclear Yb III compound with slow relaxation of magnetization and luminescent thermometry, 10 which currently accompanies other two complexes of the same metal. 13 Additionally, some other mononuclear dysprosium compounds have been published, 11,12,17 as well as a mononuclear Nd III complex, 8 which combine their character as single ion magnets (SIMs) and their luminescent thermometric capacity. Accordingly, the field of the SMMs as luminescent thermometers is still in its beginnings.…”