Parameters of molecular reactivity (PRMs) it has been used by a group to foresee the reactivity of molecules that can be interesting in the formation of complex systems and introduce capacity potentially electron donors. It has also been used by a group, correlations of PRMs with other physical-chemistries properties as reaction enthalpy, energy-free from Gibbs, and of formation enthalpy. In this work, we made the study of the parameters of molecular reactivity (PRMs) for the molecules: Quinoline-N-Oxide (C9H7NO), Nicotinamide-NOxide (C6H6N2O2), and 2,2-Dithiobispiridine-N-Oxide (C10H8N2O2S2) and compared with measures of molar conductance. Our purpose was to observe in which greatness the conductance of a neutral ligand can influence the conductance of a complex system. Starting from the obtained data we observed that all the ligands studied in this work behave as nonelectrolyte in an aqueous solution, as expected, the second proposal based on the studies of ionic salts and pseudo-covalent, and, therefore we waited that should not influence significantly in the behavior electrolyte of complex systems formed with the same ones. Such expectations will be susceptible to practical confrontation through opportune experimental procedures.

The purpose of this study was to analyze and quantify spectral parameters, the absorption bands, specifically in the uv-visible region of some N-oxide ligands. From the spectra, the area under the absorption band, the molar absorptivity, the integrated absorption coefficient and the oscillator strength by the Gaussian approximation method were calculated for each of them, using the proposed evaluation by Drago and Figgs. According to the obtained results, it can be concluded that the heterocyclic compounds studied absorb very well electromagnetic radiation in the ultraviolet region. For the ligands QUI-NO and NIC-NO it was observed that there are two types of bands, primary and secondary, being transitions of type π → π * and n → π*, respectively. For DITBIS-NO, there was only one primary band (transition 1) and two additional shoulders, which had the highest observed absorbance coefficient. These ligands are expected as potential electron donors in complex systems whose purpose is to change the energy levels of the electronic system in order to promote a better utilization of the absorbed energy and therefore a better efficiency.

The interaction of lanthanide nitrates (Ln–Nd, Sm, Dy and Er) and 1.10–phenantroline were studied and complexes of the general formulae Ln(NO3)3(C12H8N2)2 or Ln(NO3)3(o-fen)2. The complexes were characterized by elemental analyses (CHN), titration with EDTA, IR spectra and thermogravimetric analysis. X-ray powder patterns further indicated that the complexes are isomorphous having the same d -interplanar spacing.