X2Y2 isomers: Tuning structure and relative stability through electronegativity differences (X = H, Li, Na, F, Cl, Br, I; Y = O, S, Se, Te)

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​ ​ scopusId El Hamdi Lahfid, Majid​ ​
El Hamdi Lahfid, Majid
orcId Poater i Teixidor, Jordi​ researcherId Poater i Teixidor, Jordi​ scopusId Poater i Teixidor, Jordi​ ​
Poater i Teixidor, Jordi
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Bickelhaupt, F. Matthias
orcId Solà i Puig, Miquel​ researcherId Solà i Puig, Miquel​ scopusId Solà i Puig, Miquel​ ​
Solà i Puig, Miquel
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We have studied the XYYX and X2YY isomers of the X 2Y2 species (X = H, Li, Na, F, Cl, Br, I; Y = O, S, Se, Te) using density functional theory at the ZORA-BP86/QZ4P level. Our computations show that, over the entire range of our model systems, the XYYX isomers are more stable than the X2YY forms except for X = F and Y = S and Te, for which the F2SS and F2TeTe isomers are slightly more stable. Our results also point out that the Y-Y bond length can be tuned quite generally through the X-Y electronegativity difference. The mechanism behind this electronic tuning is the population or depopulation of the π* in the YY fragment ​
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