14 N NQR study of the effect of protonation on the charge distribution of some N ‐methylated ureas

14 N NQR study of the effect of protonation on the charge distribution of some N ‐methylated ureas

The 14 N NQR frequencies measured at 77 K for the amine group of the 1:1 salts of nitric acid with methylurea and 1,3‐ and 1,1‐dimethylurea and the phosphoric acid salt of 1,3‐dimethylurea are reported. The analysis of the NQR data showed that the N loses population from its π orbital. The decrease...

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Veröffentlicht in:Magnetic resonance in chemistry 1985-03, Vol.23 (3), p.145-149
Hauptverfasser: Murgich, Juan, Santana R., Magaly, Abanero, José
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creator Murgich, Juan
Santana R., Magaly
Abanero, José
description The 14 N NQR frequencies measured at 77 K for the amine group of the 1:1 salts of nitric acid with methylurea and 1,3‐ and 1,1‐dimethylurea and the phosphoric acid salt of 1,3‐dimethylurea are reported. The analysis of the NQR data showed that the N loses population from its π orbital. The decrease in π population is partially compensated by an increase in the population of the NC σ bonds. The loss of π population is enhanced when the H atoms of the amine group are substituted by electron‐donating groups such as CH 3 .
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title 14 N NQR study of the effect of protonation on the charge distribution of some N ‐methylated ureas
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