A Schiff base bis(salicylidene)propylene-1,3-diamine (salpen) 2 and its complex with zinc metal as bis(salicylidene)propylene-1,3-diaminatozinc(II) [Zn(salpen) 2 ] were prepared and characterised by various spectral techniques. The zinc complex had high thermal stability (> 300 • C) as well as high glass transition temperature (> 150 • C). Optical properties of the metal complex were studied by UV-visible absorption and photoluminescence emission spectroscopy. Multilayered organic electroluminescent devices were fabricated with a structure ITO/α-NPD/Zinc(salpen) 2 /BCP/Alq 3 /LiF/Al, using the zinc complex as an emissive material. The electroluminescence peak emission was centred at 513 nm with colour chromaticity having Commission Internationale d'Eclairage (CIE) coordinates x = 0.26 and y = 0.50. A bright blue-green emission with a luminance of 1990 Cd/m 2 was recorded at 15 V as an optimum voltage.
Antimony( I I I ) interacts with t ris [2,4,6-(2-hyd roxy-4-su I p ho-1 -nap ht hylazo)]-s-t riazi ne t ri sodi u m sa It (THT) to give a 1 : 1 dark red complex at pH 3.3-7.0. Sandell's sensitivity of the colour reaction at A , , , , 535 n m is 0.0029 yg cm-2 of Sb (E = 4.16 x l o 4 I mol-1 cm-1). Among the anions, sulphide only decomposes the antimony -THT complex quantitatively replacing THT from the complex and 6-52 pg per 25 m l of sulphide are determined indirectly.
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