The Frequency


As the composed related one (TMS) it presents hydrogen atoms equivalents, it has a frequency of high absorption (provoked for the raised shield) and the composition can be had as standard, since the hydrogen atoms of other substances absorb in lesser frequencies (lesser field). It is said in ' ' chemical displacement (d)' ' , when the absorption frequency presents different values (' ' deslocados' '), in relation to standard TMS. Soon, the referring chemical displacement to the hidrognios of the TMS is considered 0,00 (bigger frequency and greater field). In this manner, it is concluded that how much lesser will be the value of d, greaters will be the shield of hydrogen atoms, the frequency of absorption and the magnetic field. The hydrogen atoms of a on group metila directly to a carbon sp3 absorb in d 0,90, but, if the group metila will be on to an oxygen atom, the value of chemical displacement will increase for 3,60 (the electro-attractive effect of the oxygen diminishes the electronic density on ' ' H' ' , reducing the shield of these). In the methane (CH4), the hidrognios present d 0,20. In 2,2-dimetilpropanol, it has hydrogen atoms in ' ' environments qumicos' ' different, for in such a way, with different chemical displacements. The signal of hydrogen of the group hidroxila is seen as one ' ' pequeno' ' singleto in d 4,20 (since &#039 is a hydrogen; ' trocvel' ' , in the formed hydrogen linkings).

The two hydrogen atoms of the group methylene (C1) present d 3,20 (high chemical displacement provoked by the raised eletronegatividade of the atom of oxygen of hidroxila). Finally, the nine methylic hidrognios are verified by a signal type singleto in d 0,90. Then, in relation to this last presented molecule, they are seen twelve hidrognios in the ratio 1:2: 9. Under the peak of each argued signal, they appear ' ' plats' ' , which, for the action of an integrator, shows numerical values with the presented ratio, in the form of area under each ' ' pico' '.

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