Single crystal X-ray structurally characterized palladium(II) selective fluorescence and colorimetric indicator for human breast cancer cell imaging

Crystal structure of (E)-2-(4-ethoxycarbonyl-3,5-dimethyl-2-(pyrrole-2-ylmethyleneamino)-3′,6′-dihydroxylspiro[isoindoline-1,9′-xanthen]-3-one-methanol (1/1), C31H29N3O7

“…The bond length of C21-N2 is 1.275(3) Å, suggesting the existence of the Schiff base C=N moiety. All bond lengths are in the expected ranges and comparable with those of reported fluorescein hydrazones [7,[9][10][11]. The dihedral angle between the least-square plane of the benzamide and pyrrole is 11.09°.…”

Crystal structure of (E)-2-(((1H-pyrrol-2-yl)methylene)amino)-3′,6′-dihydroxyspiro[isoindoline-1,9′-xanthen]-3-one — methanol (1/2), C27H25N3O6

“…The bond length of C21-N2 is 1.274(3) Å, suggesting the existence of the Schiff base C=N moiety. All bond lengths are in the expected ranges and comparable with those of reported fluorescein hydrazones [6][7][8] and a directly related spiro compound [9]. The dihedral angle between the least-square plane of the benzamide and pyrrole is 6.18°.…”

“…Fluorescein hydrazones have been paid much attention primarily due to their considerable biological activities [5] and excellent metal ions sensoring applications [4,[6][7][8]. Particularly, fluorescein hydrazone derived pyrrole-2-aldehyde is able to act as a fluorescent probe for turn-on detection of Cu 2+ ion [4].…”

Rhodamine-based fluorescent sensors for the rapid and selective off–on detection of salicylic acid and their use in plant cell imaging

“…, high molar absorption coefficient, high fluorescence quantum yield, long excitation/emission wavelength, and biocompatibility). 24–28…”