Molecular structure, vibrational spectroscopic and HOMO/LUMO studies of some organotellurium compounds by quantum chemical investigations

Abstract

Quantum mechanical calculations of geometries, energies and vibrational frequencies of organic mercury and tellurium compounds containing azomethine group, molecules a1-a5 and containing azo group, molecules a6-a10 have been undertaken using density functional theory. The optimized geometrical parameters such as bond lengths, bond angles and dihedral angles showed that only organomercuric compounds have planer structures. The calculation of the total energy and HOMO-LUMO energy gap were showed that organotellurium compounds have higher reactivity than the corresponding organomercuric compounds. As well it showed the HOMO orbitals are localized mainly on tellurium, nitrogen and bromine atoms moieties, while the LUMO of π nature are mostly located on the phenyl ring. The calculated vibrational frequencies of molecules a1 and a7 are in good agreement with experimental frequencies with correlation coefficient r 2 value is 0.9875 and 0.9987, respectively.

Synthesis, antimicrobial activity, computational and modeling studies of some new organotellurium compounds containing azo moities

“…Several organotellurium compounds containing azo group were prepared by reaction of the mercurated azo dyes with tellurium tetrabromide in 1:1 and 2:1 mole ratio using dry chloroform as a solvent to give the o-telluratedazo dyes compounds ArTeBr3 and Ar2TeBr2, respectively [25].…”

New Mercurated and Tellurated Sulpha Compounds: Synthesis, Invitro Anticancer Study and DFT Calculation.

“…Calculations for all eight molecules were done using the Density Function Theory (DFT) method using the Perdew, Burke, and Enzerhof (PBE) theory level [29]. The basis set used was a double numerical plus polarisation (DNP) [26]. Material Studio-DMol3 ver.…”

“…The synthesis of these compounds has been of great interest in the scientific community [23][24][25]. Theoretical analyses of organotellurium compounds by using density functional theory (DFT) have been successfully used in many theoretical studies of organotellurium compounds [6,26,27].…”