887 



tri-ethylamine di-etliylamine and ethylaniino 



17.7 12.25 6.818 



When tlie volmne of C bound to N is lepresentcd by C\ and 

 tlial of C bound to C by U, wc have tlio (hree foUowing- equations: 



N + 3 (Cv + H, + a + Hj ==: 17.73 



N + H + 2 (Ca- + H, + CV + H,) = 12.25 



N + 2 H + (Cv + M. + a + H,).= 6.818 



or — H + (Cv 4- H, + C,. + 11,) = 5.483 



— 2 H -f 2 (Cv + H, + a + 11,) = 10.915 

 and so C,v+ H,*-f C, + H, = 5.483 of 5.457. 



If we take the mean of these values, and il' we take into consi- 

 deration that for C< -[- 2 H has been found before 2.76, we determine: 



C^v + 2H:=2.71. 



Hence the volume of C bound to N may be equated to that of 

 C bound to C. 



If we do so, and calculate with it the value of the group (NHJ, 

 the radical of the amine-compounds, we lind : 



(NHj = 1.3 aboul. 



This value is much smaller than for NH^ , which we call ammonia. 

 With 7"== 132.3 and y^/^. = 109.6 we calculate this value at aboul 

 3.7. So there the question rises what difiference there will be between 

 these two atom-groups. Perhaps it will have to be looked for in ihe 

 situation of the orbits of the electrons, which would then have lo 

 lie in the equator plane of the trivalcnt nitrogen atom for ammonia, 

 and for amine in the meridian plane. 



For j)ropylamine we should find a slightly too high \alue, xiz,. 



Tk 

 2.84, for the value ol CH., from — with (NH,) = 1.3, whereas we 



pi- 



found a somewhat too small value before for propane. 1 do not, 

 therefore, consider these differences as really existing. For dipropyl- 

 amine the value 1,3 -|- 16,56 ^ 17.86 might be calculated with 



1.3 -[- GCH, , whereas 17.47 follows from — . Allowing for tiie 



PIc 



approximate character of our equations this may be considered as equal. 



But the methylainines all yield a too high value, wiiich I consider 

 as a conse<pience of association, viz. 10.575 instead of 9.58, 7.43 

 instead of 6.82, and 5.944 instead of 4.06. With monometiiylamine 

 there is, therefore, a high degree of association ; about half the mole 

 cules are double molecules. 



57 



Proceedings Roy.il Acad. Amsletdam. Vol. XVi. 



