A new Schiff base has been synthesized from 4-aminoantipyrine and 3-formylsalicylic acid. The ligand has a dianionic tetradentate compartmental OONO donor system. The cobalt(II), nickel(II), copper(II) and dioxouranium(VI) complexes exist in phenolato-bridged dinuclear species, while palladium(II) gives a mononuclear complex with free ACOOH groups. The complexes have been characterized by elemental analyses, i.r., u.v.-vis, thermal and magnetic measurements.

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Reaction between 3-formylsalicylic acid and bis-(2-aminophenyl)disulphide yields a septadentate Schiff base with N 2 SO 4 donor frame of which the inner compartment is N 2 SO 2 and the outer is O 2 O 2 type. It forms several complexes with inner copper centre and outer nontransition/transition metal ions. The complexes have been characterised by elemental analyses, spectral (IR, absorption, diffused reflectance), thermal and magnetic data. Dinuclear copper complexes exhibit subnormal magnetic moments (≈ 0⋅80 BM), showing magnetic exchange, and six-line solid-state ESR spectra at 77 K.

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An indirect atomic absorption spectrometric determination of iodide has been proposed. The method involves the formation of chelate complex, [Cu(bptc)I], where BPTC, Hbptc = 2-benzoyl pyridine thiosemicarbazone, within a wide pH range (4.3—8.5), extraction of the complex into butyl acetate solvent and determination of copper signal by flame AAS and hence indirectly determining iodide. The method gave a linear graph upto 10. 4 μg ml−1 of iodide with a limit of detection (3σ) value of 47 ng ml−1. The proposed method was free of spectral interferences from large number of metal ions, anions, and organics. Hence it was successfully applied to iodide determination in laboratory chemicals and commercial grade salts.