Bonding and structure trends of thiosemicarbazone derivatives of metals—An overview

Square planar silver(I) complexes: A rare but increasingly observed stereochemistry for silver(I)

In recent years, the development of optical probes to analyse trace palladium ions (Pd2+) has attracted great attention because of the residual palladium released by catalytic converters or from various Pd-catalysed reactions. These residual palladium ions may cause potential health hazards. This review provides a brief introduction to the new methods used to determine trace amounts of Pd2+, which then mainly focuses on the different reporting systems and unique mechanisms of the colourimetric and fluorescent probes used to detect Pd2+, including Pd2+ complex formation or Pd-catalysed reactions.

Colourimetric and fluorescent probes for the optical detection of palladium ions.

A “turn-on” fluorescent and colorimetric chemosensor (RBS) for Pd2+ has been designed and synthesized through introduction of sulfur as a ligand atom to Rhodamine B. RBS exhibits high selectivity (freedom from the interference of Hg2+ in particular) and sensitivity toward Pd2+ with a detection limit as low as 2.4 nM. RBS is also a reversible sensor, and it can be made into test paper to detect Pd2+ in pure water. Compared to the chemosensors that introduced phosphorus to Rhodamine to detect Pd2+, RBS can be synthesized more simply and economically.

Highly Selective and Reversible Chemosensor for Pd2+ Detected by Fluorescence, Colorimetry, and Test Paper

Analytical properties of 1-phenyl-1,2-propanedione-2-oxime thiosemicarbazone: simultaneous spectrophotometric determination of copper(II) and nickel(II) in edible oils and seeds

Spectrophotometric determination of palladium with 5,6-dimethyl-1,3-indanedione-2-oxime.

The synthesis, spectral characteristics and analytical applications of anisaldehyde-4-phenyl-3-thiosemicarbazone (APT) are described. A simple, rapid, selective and sensitive spectrophotometric method for the determination of microgram amounts of gold, alone or in the presence of associated metals, is developed, based on the colour reaction between the metal ion and anisaldehyde-4-phenyl-3-thiosemicarbazone. The yellow-brown complex (λmax.= 365 nm) is extracted into ethyl acetate. Gold(III) reacts with the reagent in the ratio 1 : 1 (metal to ligand) over the pH range 4.0–7.0. Beer's law is obeyed over the concentration range 0.1–12.3 µg ml–1 of gold. The molar absorptivity and Sandell's sensitivity of the method are 2.12 × 104 l mol–1 cm–1 and 0.0092 µg cm–2, respectively. The relative standard deviation for ten replicate determinations of 45 µg of gold(III) was 1.71%. The interference of various ions has been studied and conditions were developed for the determination of gold in some synthetic samples.

Anisaldehyde-4-phenyl-3-thiosemicarbazone as an analytical reagent for the extractive spectrophotometric determination of gold

A simple, sensitive and rapid spectrophotometric method has been developed for the determination of osmium using cyclohexane 1,3-dione bisthiosemicarbazone mono-hydrochloride (1,3-CHDT.HCl). The method is based on the instantaneous colour reaction between 1,3-CHDT. HCl and osmium(VIII) in sodium acetate—acetic acid buffer medium (pH range 3–6). The osmium complex shows maximum absorbance at 375 nm and considerable absorbance at 510 nm. Although the complex formed between platinum(IV) and reagent (1,3-CHDT.HCl) shows maximum absorbance at 375 nm, it does not show any absorbance at 510 nm. Simultaneous determination of osmium and platinum is carried out when present alone and in presence of other foreign (associated) ions. Some physico-chemical and analytical characteristics of osmium and platinum complex are described. Interference of various foreign ions have studied and osmium is estimated selectively in the presence of constituents of platinum ores.

Rapid Spectrophotometric Determination Of Osmium With Cyclohezane 1,3-Dione Bisthiosemicarbazone Monohydrochloride: Simultaneous Determination of Osmium and Platinum

Cyclohexane-1,3-dione bisthiosemicarbazone monohydrochloride produces coloured solutions with the chromium(VI) ion in a sodium acetate - hydrochloric acid medium. The yellow species obtained (molar absorptivity 1.2 × 104 l mol–1 cm–1 at 370 nm) has been used for the spectrophotometric determination of micro-amounts of chromium(VI). Am important advantage of the method is that the tolerance limit for associated ions is very high. Hence this method can be used for the determination of chromium in alloy steels.

Rapid spectrophotometric determination of chromium(VI) using cyclohexane-1,3-dione bisthiosemicarbazone monohydrochloride

The synthesis, spectral characteristics and analytical applications of anisaldehyde-4-phenyl-3-thiosemicarbazone (APT) are described. A simple, rapid, selective and sensitive spectrophotometric method for the determination of platinum was developed based on the colour reaction between platinum (IV) and anisaldehyde-4-phenyl-3-thio-semicarbazone (APT) in the pH range 1.7 - 3.0. The yellow coloured species has an absorption maximum at 360 nm. The complexation is complete within 1 min. A five-fold excess of the reagent is required for complete complex formation. Beer's law is obeyed over the concentration range 0.1 -20 ppm of Pt(IV). The mtilar absorptivity and Sandell's sensitivity are 1.58 × 104 l. mol−1 cm−1 and 0.0123 ug of Pt(IV) cm−2, respectively. The effects of pH, time concentration of reagent, order of addition of reagents and the interference from various ions were investigated. The method has been employed for the determination of platinum in synthetic mixtures whose composition correspo...

D Venkata Reddy

Papers

Spectrophotometric determination of palladium with 5,6-dimethyl-1,3-indanedione-2-oxime.

Anisaldehyde-4-phenyl-3-thiosemicarbazone as an analytical reagent for the extractive spectrophotometric determination of gold

Rapid Spectrophotometric Determination Of Osmium With Cyclohezane 1,3-Dione Bisthiosemicarbazone Monohydrochloride: Simultaneous Determination of Osmium and Platinum

Rapid spectrophotometric determination of chromium(VI) using cyclohexane-1,3-dione bisthiosemicarbazone monohydrochloride

Rapid Extraction Spectrophotometric Determination of Platinum Using Anisaldehyde-4-Phenyl-3-Thiosemicarbazone as a Chromogenic Reagent