Applications of the molecular orbital graph theory (XI)

2000 ◽  
Vol 43 (1) ◽  
pp. 17-26
Author(s):  
Hu Shixian ◽  
Liu Xiaoping ◽  
Zhao Honggang ◽  
Cao Yang
Keyword(s):  
Graph Theory ◽  
Molecular Orbital ◽  
Orbital Graph

scholarly journals Machine Learning Predictor Models in the Electronic Properties of Alkanes based on Degree-Topology Indices

2021 ◽  
Vol 11 (11) ◽  
pp. 1-14
Author(s):  
Zubainun Mohamed Zabidi ◽  
◽  
Ahmad Nazib Alias ◽  
Nurul Aimi Zakaria ◽  
Zaidatul Salwa Mahmud ◽  
...  
Keyword(s):  
Molecular Structure ◽  
Machine Learning ◽  
Graph Theory ◽  
Linear Regression ◽  
Electronic Properties ◽  
Molecular Orbital ◽  
Machine Learning Algorithms ◽  
Chemical Graph ◽  
Chemical Graph Theory ◽  
Homo And Lumo

New topology indices that are degree-based have been introduced to represent molecular structure from chemical graph theory. The indices give a new sight into the physical properties of the chemical compounds. The correlation of physiochemical properties with chemical graph theory can be done using the Quantitative Structure Properties Relationship (QSPR). Highest Occupied Molecular Orbital (HOMO) and Lowest Unoccupied Molecular Orbital (LUMO) are two basic electronic properties that describe the physiochemical of molecular structure. In computational chemistry, HOMO and LUMO can be calculated by ab initio molecular orbital calculation such as semi-empirical and density functional theory (DFT) method. However, these methods are time-consuming computations. In this paper, predictor model of HOMO and LUMO were developed using Machine Learning algorithms namely Linear Regression, Ridge Regression, LASSO Regression and Elastic Net Regression. The results showed that the performance achievement of each of the machine learning algorithms varied in accordance to the topology indices descriptors and the most outperformed model was presented by Linear Regression with the Moment Balaban Indices (JJ). This paper provides the fundamental design and implementation framework of predicting the HOMO and LUMO electronic properties

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