π-Extended diphosphonium-bridged ladder stilbenes: water-soluble fluorophores with up to eight annulated rings.

ABSTRACT: Diphosphapentalene-derived P-heterocyclic materials with two directly fused phospholes are fairly scarce, at least in comparison to their simpler congeners containing only one phosphole entity. To fill that void, π-conjugated naphtho-fused phospholo[3,2-b]phosphole dications were prepared via in situ oxidation of the corresponding diphosphines. In the case of one specific naphtho-annulation pattern, a hitherto unprecedented bis-(Δ²-phosphetene) dication was formed selectively and isolated as a colorless powder. DFT modelling studies revealed that this bis-(Δ²-phosphetenium) salt is produced via single electron transfer steps, while all the phospholo[3,2-b]phosphole salts may either be generated via their P-diylidic coun

SUBMITTER: Senn S 

PROVIDER: S-EPMC12499890 | biostudies-literature | 2025 Nov

REPOSITORIES: biostudies-literature