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Oliveira F.C.,Laboratorio Of Espectroscopia Of Aniquilacao Of Positrons Leap | Oliveira F.C.,Federal University of Minas Gerais | Denadai A.M.L.,Federal University of Minas Gerais | Fulgencio F.H.,Laboratorio Of Espectroscopia Of Aniquilacao Of Positrons Leap | And 4 more authors.
Journal of Molecular Structure | Year: 2012

Positronium formation in triphenylphosphine oxide (TPPO), triphenylmethanol (TPM), and systems [TPPO(1-X)ṡTPM X] has been studied. The low probability of positronium formation in complex [TPPO0.5ṡTPM0.5] was attributed to strong hydrogen bond and sixfold phenyl embrace interactions. These strong interactions in complex reduce the possibility of the n- and π-electrons to interact with positrons on the spur and consequently, the probability of positronium formation is lower. The τ3 parameter and free volume (correlated to τ3) were also sensitive to the formation of hydrogen bonds and sixfold phenyl embrace interactions within the complex. For physical mixture the positron annihilation parameters remained unchanged throughout the composition range. © 2012 Elsevier B.V. All rights reserved. Source

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