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Phosphorus hydrazides PhP(O)[N(Me)NH 2 ] 2 , (S)P[N(Me)NH 2 ] 3 , and N 3 P 3 [N(Me)NH 2 ] 6 were condensed with 7-diethylaminocoumarin-3-aldehyde (RCHO) to afford the corresponding hydrazones PhP(O)[N(Me)NCHR] 2 (1), (S)P[N(Me)NCHR] 3 (2), and N 3 P 3 [N(Me)NCHR] 6 (3). The structural characterization...
A modular ligand design allowed the assembly of four phosphorus-supported pyrene-containing ligands. The number of pyrene arms could be varied from 1 to 6 depending on the phosphorus support. While ligands containing one and three pyrene arms are excellent fluorescence-based sensors of Cu 2+ , the ligand containing two pyrene arms shows a high specificity for Mg 2+ .
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