| dc.description |
The amino group stretching frequency (νNH) and the <sup>15</sup>N chemical shift (δ<sup>15</sup>N) were measured for saturated primary amines. A good linear relationship was found between them, with the slope being the opposite of that found in substituted anilines. A linear relationship was also found for substituted anilines between νNH and the <sup>15</sup>Nâ <sup>1</sup>H spin coupling constant (<sup>1</sup> J <sup>15</sup>N,<sup>1</sup>H). CNDO/2 calculations were done for representative molecules to obtain the NH stretching frequency, the local paramagnetic term of <sup>15</sup>N, and the nitrogen 2sâ hydrogen 1s bond order, on the basis of which the characteristic behaviour found for the i.r. and n.m.r. parameters was interpreted. |
