Phosphorus‒bismuth peri-substituted acenaphthenes: a synthetic, structural and computational study

Phillip Nejman, Thomasine Emily Curzon, Michael Buehl, David McKay, J Derek Woollins, Sharon E. Ashbrook, David Bradford Cordes, Alexandra Martha Zoya Slawin, Petr Kilian

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Abstract

A series of acenaphthene species with a diisopropylphosphino group and a variety of bismuth functionalities in the peri-positions were synthesised and fully characterised, including single crystal X–ray diffraction. The majority of the reported species feature a relatively rare interpnictogen P−Bi bond. The series includes the phosphine¬−bismuthine, Acenap(PiPr2)(BiPh2) 2 (Acenap = acenaphthene-5,6-diyl), which was subjected to a fluorodearylation reaction to produce Acenap(PiPr2)(BiPhX) 5−8 and 10 (X = BF4-, Cl, Br, I, SPh), displaying varying degrees of ionicity. The geminally bis(acenaphthyl) substituted [Acenap(PiPr2)2]BiPh 3 shows a large through-space coupling of 17.8 Hz, formally 8TSJPP. Coupling deformation density (CDD) calculations confirm the double through-space coupling pathway, in which the P and Bi lone pairs mediate communication between the two 31P nuclei. Several synthetic routes towards the phosphine−diiodobismuthine Acenap(PiPr2)(BiI2) 9 have been investigated, however the purity of this, surprisingly thermally stable potential synthon, remains poor.
Original languageEnglish
JournalInorganic Chemistry
VolumeArticle ASAP
Early online date9 Apr 2020
DOIs
Publication statusE-pub ahead of print - 9 Apr 2020

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