Chemistry can be defined as the study of matter and the changes it undergoes. You¡¯ll sometimes hear it called the central science because it is the connection between physics and all the other sciences, starting with biology. 20737-42-2, Name is 3-Oxo-3,4-dihydropyrazine-2-carboxylic acid, molecular formula is , belongs to Pyrazines compound. In a document, author is Thakkar, Ajit J., COA of Formula: C5H4N2O3.
Dipole oscillator strength distributions, sum rules, mean excitation energies, and isotropic van der Waals coefficients for benzene, pyridazine, pyrimidine, pyrazine, s-triazine, toluene, hexafluorobenzene, and nitrobenzene
Experimental, theoretical, and additive-model photoabsorption cross sections combined with constraints provided by the Kuhn-Reiche-Thomas sum rule and the high-energy behavior of the dipole oscillator strength density are used to construct dipole oscillator strength distributions for benzene, pyridazine (1,2-diazine), pyrimidine (1,3-diazine), pyrazine (1,4-diazine), s-triazine (1,3,5-triazine), toluene (methylbenzene), hexafluorobenzene, and nitrobenzene. The distributions are used to predict dipole sum rules S(k) for -6 <= k <= 2, mean excitation energies I(k) for -2 <= k <= 2, and isotropic van der Waals C-6 coefficients. A popular combination rule for estimating C-6 coefficients for unlike interactions from the C-6 coefficients of the like interactions is found to be accurate to better than 1% for 606 of 628 cases (96.4%) in the test set. If you are hungry for even more, make sure to check my other article about 20737-42-2, COA of Formula: C5H4N2O3.