RESUMO
In this paper, we show a strategy to modify salphen-type Schiff base ligands with naphtol (SYML1) and pyrocathecol (2,3-dihydroxyphenyl) groups (SYML2), or a combination of both (ASYML). Each of these ligands can be used to obtain polynuclear metal complexes following two different strategies. One relies on using metals that are either too large for the N2O2 cavity or not fond of coordination number 4 and the other one relies on forcing the polynuclear species by adding functional groups to the hydroxybenzaldehayde in order to have extra coordination sites in the ligand. We report and characterize the mononuclear complexes SYML1-Cu and SYML1-Ce, along with the dinuclear complex SYML1-Fe and the tetranuclear species SYML2-Mn. The asymmetric ligand ASYML routinely hydrolyzes into the symmetric ligands in the reaction mixtures. SYML1-Fe displays a nearly linear Fe-O-Fe bridge with very strong antiferromagnetic coupling between the Fe(III) ions.
Assuntos
Catecóis/química , Complexos de Coordenação/síntese química , Naftóis/química , Fenilenodiaminas/química , Bases de SchiffRESUMO
Many women have incorrect knowledge about nutrition in pregnancy owing to false beliefs derived from popular practices. More than 90% of our cohort of pregnant women during early pregnancy (<12 weeks of gestational age) gave at least one incorrect answer to the five questions relative to common myths about nutrition in pregnancy. Education was inversely associated with the percentage of incorrect answers, and the lowest percentage of any mistakes was found in the small number of women who received nutritional information by a dietician. In conclusion, the usual sources of information about nutrition in pregnancy are not adequate to overcome the false beliefs acquired by traditions.
