Tying a knot between crown ethers and porphyrins

• Maksym Matviyishyn and
• Bartosz Szyszko

Beilstein J. Org. Chem. 2023, 19, 1630–1650, doi:10.3762/bjoc.19.120

• , interacting with the calixpyrrole macrocycle through hydrogen bonds. The water molecule was bound near the fluoride and was further stabilised through hydrogen bonding to the oxygen atoms in the central part of the receptor. This selective fluoride binding was evidenced with the help of 1H NMR spectroscopy

• ]. Sessler and co-workers reported on the synthesis of an expanded capped porphyrinoid [120]. The macrocycle incorporated the sapphyrin framework and was demonstrated to act as a ditopic receptor for ammonium fluoride binding cations in the crown ether pocket and fluoride interacting within the expanded

• structure of 4-CsF is shown on the right [101]. Ion-pair binding by 6. The molecular structure of (6-CsCl)2 is shown on the right [103]. Hydrated fluoride binding by 7 [104]. The synthesis of 13. Tripyrrane-based crown ether-embedding porphyrinoid 15. The flexibility of 16-Co [66]. The synthesis of 16-V [67

Synthesis of indolo[3,2-b]carbazole-based new colorimetric receptor for anions: A unique color change for fluoride ions

• Ajit Kumar Mahapatra,
• Giridhari Hazra and
• Prithidipa Sahoo

Beilstein J. Org. Chem. 2010, 6, No. 12, doi:10.3762/bjoc.6.12

• orange) observed. Keywords: anion binding; colorimetry; fluorescence quenching; fluoride binding; indolocarbazole; Introduction The design and synthesis of chromogenic receptors for biologically important and environmentally harmful anion pollutants has attracted considerable attention in