Chemiluminescent Schiff bases

Oxidative chemiluminescence of some nitrogen nucleophiles in the presence of formic acid as an ancillary reductant

“…Several chemiluminescent reactions involving nitrogen compounds have been studied. 5,6,8,[26][27][28][29] Examination of their proposed mechanisms shows that they will not serve as models for the reactions under investigation.…”

“…Townshend, 3 Worsfold 1 and Andrews 4 have reported on a range of usable oxidising agents including acidified permanganate, bromine, cerium(iv) and hypochlorite. Use of Fenton's reagent [hydrogen peroxide-iron(ii)] for the chemiluminescent oxidation of Schiff bases was studied by McCapra and Burford 5 and applied analytically by Hayashi et al 6 Potassium permanganate has proved to be a particularly versatile agent for chemiluminescent oxidation. 3 A number of analytes have been found to be chemiluminescent on oxidation by permanganate only in the presence of an ancillary reductant.…”

“…15 The hypothesis that hydroxylamine would be chemiluminescent on oxidation was based more tenuously on its enhancing effect on the chemiluminescent oxidation of pyrogallol by iodate, 16 supported by the observation that the amine function is often present in compounds undergoing chemiluminescent oxidation, e.g., acetaminophen, catecholamines and polyamines. 3,4,8 An example of a Schiff base is included in the study because of demonstrations of chemiluminescent oxidation of compounds in this class by McCapra and Burford, 5 by Hayahsi et al, 6 and by Ahmed and Townshend. 9 We also report novel observations of the effects of bases and iron salts on the permanganateformic acid reaction, which can be explained by the findings of kinetic studies of that reaction.…”

A comparative study on chemiluminescence propperties of some inorganic systems

“…A similar effect has been observed in the systems with propylene carbonate. In the latter systems the energy from H 2 O 2 decomposition is captured by the excited carbonyl reaction products, according to the mechanism proposed by Mc Capra [13] ( Table 1). The yield of CL in the systems type: metal ion\PC\H 2 O 2 is additionally enhanced by addition of ethanol.…”

“…The spectrum reveals a broad band with a maximum at ∼ 550 nm, which indicates that system VI generates a different type emitter than the system Co 2+ \HCO 3 − \H 2 O 2 , and this different emitter is formed in a process whose yield is similar to that of a radical decomposition of carbonates. The double bond in the propylene carbonate molecule and the presence of oxygen radicals in the systems with hydrogen peroxide suggests that the process of CL in system VI occurs according to the McCapra mechanism [13] ( Table 1).…”