A platinum(II) complex of 5,5'-bis(trimethylsilylethynyl)-2,2'-bipyridine displays unusually reversible colour and luminescence changes when exposed to specific organic vapours, correlated well with Pt...Pt distances as well as pi-pi and C-H...(C[triple bond]C) interactions in the stacking of square-planar platinum(II) moieties.
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Ni et al. (2009) studied this question.
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