Compression of a parallel four-fold phenyl embrace involving two cations in [Pd([9]aneS3)(PPh3)2](PF6)2 ([9]aneS3=1,4,7-trithiacyclononane) leads to π⋅⋅⋅π stacking interactions and concomitant pyramidalization at the ipso carbon atom of one of the phenyl rings. These pressure-induced transformations have been rationalized by Hirshfeld surface analysis, density functional calculations and natural bond orbital analysis.
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Wong et al. (2013) studied this question.