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- W2088593058 abstract "Density functional theory (DFT) calculations have been used to investigate the process of dimerization for the three chalcogen diimides MeNENMe (E = S, Se, Te). DFT calculations for these monomers reveal that the energies of the syn,syn and syn, anti isomers differ by <3.5 kJ mol-1 for all three chalcogens while the anti,anti isomers are substantially higher in energy (by 25−39 kJ mol-1). A qualitative understanding of this difference can be derived from consideration of the electronic structures of the chalcogen diimides. In particular, the antibonding interaction between the in-plane nitrogen lone pairs and the pz orbital on sulfur destabilizes the most sterically favorable anti,anti isomer. The calculated dimerization energies for MeNENMe show that the process is endothermic (ΔE = 34.9 kJ mol-1) for E = S, approximately thermoneutral (ΔE = −2.8 kJ mol-1) for E = Se, and strongly exothermic (ΔE = −82.9 kJ mol-1) for E = Te. A qualitative analysis of the orbital interactions involved in the dimerization process reveals that the LUMOs of the diimide monomers are populated in a stabilized bonding LUMO−LUMO interaction that is lower in energy than the antibonding HOMO−HOMO interaction. The most significant contribution to the energy of dimerization is the energy required to distort the planar diimide monomer into half of the butterfly dimer." @default.
- W2088593058 created "2016-06-24" @default.
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- W2088593058 date "1998-01-01" @default.
- W2088593058 modified "2023-10-17" @default.
- W2088593058 title "Chalcogen Diimides: Relative Stabilities of Monomeric and Dimeric Structures, [E(NMe)<sub>2</sub>]<i><sub>n</sub></i> (E = S, Se, Te; <i>n</i> = 1, 2)" @default.
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- W2088593058 doi "https://doi.org/10.1021/ic970680f" @default.
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