Molecular orbital model of the influence of interaction between O2 and aluminosilicate sites on the tripletsinglet energy gap and reactivity
The behavior of O2 molecule in models of acid aluminosilicate sites on any kind of material was investigated using reliable QM ab initio calculations. The tripletsinglet energy gap of isolated O2 was calculated at confident levels of theory with different basis sets as a reference. Models of aluminosilicate active sites interacting with oxygen in their singlet and triplet electronic states were considered for two kinds of O2 arrangements. Geometry optimizations were performed on both non-corrected and corrected BSSE potential energy surfaces, realizing that good modeling of heavy atomhydrogen interactions is sensitive to BSSE corrections during these processes. Energies were further evaluated at higher level of theory to test tendencies. Singlet oxygen appears more attractive to active aluminosilicate sites than those calculated with triplet oxygen, indicating a source of oxidative efficiency for designed nanostructures containing such molecular residues. It was clearly seen that aluminosilicate groups, appearing ubiquitously in several materials, could reduce the O2 tripletsinglets energy gap by at least 10kJ/mol. Some elegant features of oxygen interactions with such sites were further analyzed by means of the atoms in molecules (AIM) theory.
aluminosilicate oxygen molecule computational modelation