Synthesis and characterization of gallium complexes bearing N-arylmethylenethiobenzahydrazone ligands; crystal structure of diethyl[N-(4-N,N-dimethylamino)benzylidene thiobenzahydrazonato]gallium

Shen, Yingzhong; Zhang, Yiying; Li, Ye; Tao, Xian; Wang, Yan

doi:10.1016/j.ica.2006.08.041

Cited by 6 publications

(1 citation statement)

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“…With further investigations, using a high concentration (i.e., millimolar level) of other transition-metal ions, such as Mn 2+ , Fe 2+ , Co 2+ , Ni 2+ , Zn 2+ , and Cd 2+ , neither a color change nor a fluorescent enhancement was observed (Figure ). It was suggested that RS1 did not bind these metal ions simply, though the parent metal-binding functionality thiobenzoylhydrazone was known to bind not only Hg(II) but also the metal ions mentioned above . The addition of Cu 2+ or Ag + into the solution of probe RS1 , under the same conditions, can induce the small but significant enhancement of the absorbance at about 565 nm.…”

Section: Resultsmentioning

confidence: 99%

Recognition Preference of Rhodamine-Thiospirolactams for Mercury(II) in Aqueous Solution

Huang

Song²,

He³

et al. 2009

Inorg. Chem.

160

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This work presents the design, syntheses, photophysical properties and Hg(2+)-binding of the red-emitting rhodamine derivatives RS1, RS2, and RS3 with different coordination ability and different spatial effects that derived from rhodamine thiohydrazone chromophores and respective carboxaldehydes (benzaldehyde, pyridine-2-carboxaldehyde, ferrocenecarboxaldehyde). Chemosensors RS2 and RS3 afford turn-on fluorescence enhancement and display high brightness in water with the EC(50) for Hg(2+) of 0.5 ppb. The fluorescence intensities are nearly proportional to the amount of Hg(2+) at ppb level, when employing 100 nM probes in water. The fluorescence responses of these two chemosensors are Hg(II) specific, and the probes are selective for Hg(II) over alkali, alkaline earth metals, divalent first-row transition metal ions, and Group 12 congeners Zn(II) and Cd(II), as well as heavy metals Pb(II) and Ag(I). X-ray crystal structure analyses exhibit the thioether derivative of the spirolactone in these compounds. Hg(II)-specific binding in water would make the opening of the spirolactam ring and consequently causes the appearance of strong absorption at visible range, and the obvious and characteristic color change from colorless to pink. Compared to the thioamides, the improved selectivity for Hg(2+) is attributed to the poorer coordination affinity of the thioether over other interference metal ions.

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Section: Resultsmentioning

confidence: 99%