An exchange reaction of the sodium salt of 3 methyl 1 phenyl 4 formylpyrazol 5 one (HL) with chlorides or nitrates of lanthanides (Ln = La, Nd, Sm, Eu, Gd, Tb, Dy, and Yb) was used to synthesize coor dination compounds of composition LnL 3 ⋅ nSolv (Solv = H 2 O or EtOH). According to powder X ray dif fraction data, these compounds constitute two series: one comprises lanthanum and neodymium complexes, and the other, samarium, europium, gadolinium, terbium, dysprosium, and ytterbium complexes. For the complexes of the first series, the structure was solved in a single crystal diffraction experiment carried out on [La 2 (μ L) 3 (L) 3 (H 2 O) 3 ] ⋅ 2MeOH. The lanthanum atoms in the complex are at a distance of 4.222(2) Å from each other, and they are structurally nonequivalent and linked by three 5 hydroxy 4 formylpyrazole anions. Solid phase samples of the coordination compounds under study feature weak luminescence in the spectral regions intrinsic to lanthanide cations.
Graphical abstractNew lanthanide (Ln) coordination compounds of the composition [H3O][LnL4]·nH2O (n = 1–3, Ln = Nd, Sm, Eu, Tb; HL – 3-methyl-1-phenyl-4-formylpyrazol-5-one) with hydroxonium cation as counter were synthesized and investigated by various means, showing the rare case of stronger Sm(III) luminescence compared with an analogues Eu(III) compound.
Reference data on the properties of rubbers and some fillers included in their composition are considered. Based on them, the values of electric and thermal power necessary for the processing of waste tires and other rubber products are calculated. The calculations showed the undoubted advantage of the mechanothermal destruction of rubber products in comparison with the classical pyrolysis methods.
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