Chapter 7 Aromaticity
and Other Special Properties of Heterocycles: Pi-Excessive Ring Systems and Mesoionic Ring Systems
1-Naphthyloxy containing polymers were less stable (IIa-e) than biphenyloxy (I11a-e) containing polymers ascribed to aromaticity
and steric hindrance.
The lower H/C ratios of the GW550 and PS biochars suggests increased aromaticity
and maturation (Krull et al.
Absorbance increases with pH, aromaticity
, total carbon content and molecular weight .
This study supports the notion that the Walkley Black method is inappropriate for determination of carbons with high degrees of aromaticity
and stability in soil, and significant underestimation of organic C content in soil is possible.
We can observe the consistency of both data demonstrating the well-known low aromaticity
of Estonian kukersite kerogen.
29 indicated the degree of aromaticity
or unsaturation; whereas, the large values represented the aliphaticity .
The C/N ratio indicated the aromaticity
and the level of decomposition of organic material (Stevenson 1994; Rosa et al.
1996), which suggests greater aromaticity
of this sample.
1a and 1b) and this could be explained in terms of the increase in the apparent aromaticity
due to the presence of more triazine rings.
In collaboration with Professor Sason Shaik, he applied VB theory to fundamental concepts of organic chemistry such as aromaticity
, hypervalence, odd-electron bonds, prediction of reaction barriers from properties of reactants and products, and so on.
The harmonic oscillator measure of aromaticity
(HOMA) was calculated as described by Krygowski .
1996), which indicates the greater degree of aromaticity
of this sample.
In a typical example, the degrees of aromaticity
of the isotropic and the dispersed phases were found to be of 32.
The bands at 903(w), 830(s) cm-1 are due to the aromaticity
of the compound.