This critical review is focused on examples reported in the year 2009 dealing with the design of chromogenic and fluorogenic chemosensors or reagents for anions (264 references).

/pdf/chromogenic-and-fluorogenic-chemosensors-and-reagents-for-23e04ey3wj.pdf

Chromogenic and fluorogenic chemosensors and reagents for anions. A comprehensive review of the years 2010-2011.

Pyrrolidine constrained bipyridyl-dansyl click fluoroionophore as selective Al3+sensor

Developments in the field of fluorescent chemosensors for trace level determination of Al3+ have been described. Design, synthesis and applications of Al3+ selective fluorescent sensors have attracted a great deal of attention due to their versatile and emerging biological implications. A systematic description of different fluorescent probes based on their fluorophore skeleton has been made. The sensing mechanism of each fluorescent probe has been briefly discussed. Special emphasis has been given to consideration of the greenness of the methods, particularly, the use of greener solvents like water. The review covers published work on fluorescence sensing of Al3+ worldwide together with our own contribution in this field.

Fluorescent probes for selective determination of trace level Al3+: recent developments and future prospects

A novel pyrimidine based Al3+ selective fluorescent probe (L) has been synthesised by a facile one step coupling of 4,5-diamino pyrimidine with 2-hydroxy naphthaldehyde. L has been obtained in pure crystalline form without any column chromatographic purification. Upon binding Al3+, the single emission band of L undergoes red shift from 470 nm to dual emission peaks viz. 505 nm and 538 nm with appearance of a very intense green luminescence. L could detect as low as 2.9 × 10−7 M Al3+ with a binding constant value of 5.4 × 104 M−1. Al3+ contaminated cells became green in the presence of L making it suitable for intracellular Al3+ detection.

An Al3+ induced green luminescent fluorescent probe for cell imaging and naked eye detection

Two new Schiff base complexes, [ZnL(Ac)]2 (1) and [CuLCl]·H2O (2) (HL = 2-(2′-hydroxynaphthylmethylene)aminophenylbenzimidazole, Ac = acetate) were synthesized by a one-pot reaction and characterized by elemental analyses, IR and single-crystal X-ray diffraction. Fluorescence of complex 1 showed “on–off–on” switching when Cu2+ and cyanide were sequentially detected. This phenomenon was investigated by UV-Vis absorption, fluorescence and ESI-MS spectra, and theoretical calculations to explain the response. Complex 1 can selectively respond to Cu2+ with the fluorescence “turn-off” owing to the formation of complex 2 in the solution. Interestingly, the quenched fluorescence of complex 1 by Cu2+ ions could be turned on after the addition of cyanide owing to the displacement of L− by CN− to form [Cu(CN)x]n−, making complex 1 a selective CN− probe. In addition, the results of the MTT assay experiment indicate that complex 1 has a low toxicity to cells and can be used to detect intracellular Cu2+ ion by live cell imaging.

A highly selective and sensitive Zn(II) complex-based chemosensor for sequential recognition of Cu(II) and cyanide.

A new thiazoline-containing cobalt(II) complex displayed colorimetric and fluorescent “turn-on” selectivity and sensitivity toward fluoride anions compared to the other anions investigated through color changes from pink to blue and changes in the emission spectra at approximately 570 nm when excited at 520 nm.

A thiazoline-containing cobalt(II) complex based colorimetric fluorescent probe: “turn-on” detection of fluoride

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A thiazoline-containing cobalt(II) complex based colorimetric fluorescent probe: “turn-on” detection of fluoride