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Peer Reviewed Journal
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Kirill Nikitin, Helge Mueller-Bunz, Declan G. Gilheany
2013
January
Chemical Communications
Direct evidence of a multicentre halogen bond: unexpected contraction of the P-​XXX-​P fragment in triphenylphosphine dihalides
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  • Triphenylhalophosphonium halides, Ph3PX2, form crystals comprising bridged linear cations [Ph3P-​X-​X-​X-​PPh3]​+ where the X3 bridge is shortened from 6.56 Å in Cl-​Cl-​Cl to 6.37 Å in the Br-​Br-​Br system.  It is proposed that this structure is stabilized by five-​center​/six-​electron (5c-​6e) hypervalent interactions.

10.1039/c2cc38363b
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