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Spectrophotometric study of complexes of mercury(II) with mono- and dithiosemicarbazones

1984; Elsevier BV; Volume: 30; Issue: 1 Linguagem: Inglês

10.1016/0026-265x(84)90143-7

1095-9149

Antonio Gallardo Céspedes, D. Pérez Bendito, Miguel Valcárcel,

Analytical Chemistry and Sensors

The formation of complexes at pH 4.7 of the Hg(II) with five monothiosemicarbazone and two dithiosemicarbazone has been studied. The mercury(II) reacts with monothiosemicarbazones of salicylaldehyde (λmax = 363 nm, E = 1.69 × 104liters · mol−1cm−1), pi-colinadehyde (λmax = 363 nm, E = 2.38 × 104liters · mol−1cm−1), 6-methyl-picolinaldehyde (λmax = 363 nm, E = 2.28 × 104liters · mol−1cm−1), di-2-pyridylketone (λmax = 380 nm, E = 2.08 × 104liters · mol−1cm−1), and o-naphthoquinone (λmax = 540 nm, E = 1.03 × 104liters · mol−1cm−1) and with dithiosemicarbazones of 1,4-dihydroxyphthalimide (λmax = 430 nm, E = 2.56 × 104liters · mol−1cm−1) and dipyridylglyoxal (λmax = 363 nm, E = 2.37 × 104liters · mol−1cm−1). A critical comparison of the stoichiometry and apparent stability constant of complexes with mono- and dithiosemicarbazones is given.