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The negative nuclear\u2010independent chemical shift values and the positive aromatic stabilization energies confirm that they are aromatic compounds. In particular, the 1\u2010<jats:italic>H<\/jats:italic>\u2010phosphininium cation even exhibits stronger aromatic character than the well\u2010known aromatic phosphinine. The aromatic substituents have strong capability to attract electrons. It is the conjugation and aromaticity that keeps the stability and conformations of the molecules investigated. Owing to the perturbation of the aromatic substituted groups, the predicted large <jats:italic>T<\/jats:italic> values and the enlarged HOMO\u2010LUMO gap of the phosphininium cation indicate that these compounds are expected in experiment. \u00a9 2007 Wiley Periodicals, Inc. 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