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The crystal structure of a platinum(II) supra-molecular building block, [Pt(dbbpy)(NCCH 3 ) 2 ](BF 4 ) 2 (dbbpy = 4,4'-di- tert -butyl-2,2'-bi-pyridine, C 18 H 24 N 2 ) is an example of a rare head-to-head dimer, even with the bulky tert -butyl groups of the bi-pyridine. This packing motif still enables significant π-π inter-actions between two pyridyl groups, and may result from the close proximity of the tetra-fluorido-borate ions to the platinum(II) complexes, resulting in intra-molecular H⋯F distances between 2.156 and 2.573 Å.

acta crystallographica. section e, crystallographic communications

Crystal structure of bis(acetonitrile-κN)(4,4′-di-tert-butyl-2,2′-bipyridine-κ2 N,N′)platinum(II) bis(tetrafluoridoborate) packing as head-to-head dimers