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We report the single crystal structures of 1,4-bis(triisopropylsilyl) buta-1,3-diyne, C22H42Si2, and 1,4-bis(biphenyl-4-yl) buta-1,3-diyne, C28H18, the packing in both of which illustrates the versatility of weak C-H center dot center dot center dot pi supramolecular interactions in dictating the overall solid-state structures.