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Density functional theory (DFT) calculations of conformational energies and interconversion pathways in 1,2,7-thiadiazepane

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Author(s): MINA HAGHDADI | NAHID FAROKHI

Journal: Journal of the Serbian Chemical Society
ISSN 0352-5139

Volume: 76;
Issue: 3;
Start page: 395;
Date: 2011;
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Keywords: conformational analysis | 1 | 2 | 7-thiadiazepane | DFT calculation

ABSTRACT
The molecular structure and conformational analysis of 1,2,7-thiadiazapane conformers were investigated by density functional theory (DFT) calculations at the B3LYP/cc-pVDZ level of theory. Four twist-chair (TC), six twist-boat (TB), two boat (B), two chair (C) and four twist (T) conformers were identified as minima and transition states for 1,2,7-thiadiazepane. The TC1 conformer is the most stable conformer and the twist-chair conformers are predicted to be lower in energy than their corresponding boat and chair conformations. DFT predicts a small barrier to pseudo-rotation and a remarkable activation barrier for the conformational interconversion of the twist-chair conformers to their corresponding boat conformers. The simplest conformational process and the one with the lowest barrier is the degenerate interconversion of the twist-chair 3 (TC3) conformation with itself via the Cs symmetric chair (C2) transition state. The calculated strain energy barrier for this process is 2.41 kJ mol-1. The highest conformational interconversion barrier is between TC2 and twist-boat 3 (TB3) forms, which was found to be 75.62 kJ mol-1.
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