Phthalocyanine-based molecular paramagnets. Effect of double-decker structure on magnetothermal properties of gadolinium complexes

Recent progress in organometallic porphyrin‐based molecular materials for optical sensing, light conversion, and magnetic cooling

“…[167][168][169][170][171] A paramagnet heat capacity observed in the same experiment as for MCE values and calculated according to Equation (10 was evaluated as a difference (Equation (11). In the subsequent works, [34,166,[172][173][174][175][176][177] a new method based on using Equation (12 had allowed to eliminate the influence of a cell without a paramagnet and to determine the paramagnet true MCE. In the same time, the heat capacity of a paramagnet was independently observed by a direct differential scanning calorimetry method.…”

“…For the temperatures close to room, typical temperature dependencies are given in Figure 12 derived using the data of works. [173,174,178] The predominance of the electronic subsystem in magnetization is manifested in the absence of the MCE-C p correlation among structures of the same type, which is visible from the appearance of anomalies in the C p temperature dependencies for specific paramagnet as in the case of (AcO)GdPc or GdPc 2 [174] (Figure 12, Line 2).…”

Magnetocaloric Effect in Carbon-Containing Compounds

“…The work was devoted to the studies of the structure, synthesis, composition, magnetic properties and applicability of magnetic 3d, 3d-4f and 4f-coolants in different spheres of activity. Homometallic gadolinium compounds were studied in different clusters where the values of the magnetic component of the entropy change -∆S m , which is a measure of MCE, reached about 27 J/kg at 5 K and changes of magnetic field from 0 to 1 T. Thus, studying zero-sized lanthanides(III) "built" into the coordination sphere of the tetrapyrrole macrocycle is a new field of research with only a small number of studies which include, in addition to the works on SMMs that were partially quoted in the previous section, our research into magnetocaloric properties of paramagnetic metalloporphyrins/metal phthalocyanines [30][31][32][33][34][35][36][37][38][39][40].…”

“…An example of their formula is given below (Fig. 4.1) at the temperature of 270-350 K and magnetic induction 0 -1 T [30][31][32][33][34][35][36][37][38][39][40]41].…”

“…spin-carrier and a fragment for spin coupling (overlapping). A similar strategy was used for a paramagnetic -a double-decker oneelectron oxidized gadolinium complex whose magnetocaloric properties are described in works [31,32] in comparison with the corresponding 1:1 complex (formulae (AcO)GdPc and GdPc 2…”