The use of azide ions (mainly in the form of NaN3 solutions) as test reagents in chemical, photochemical, and chemiluminescent studies, as well as the development of a specific chemiluminescent reagent for singlet oxygen are considered.

Quantum yields are determined for luminol and Fe II in the chemiluminescence of luminol initiated by Fe II salt solutions. It is concluded that chemiluminescence is initiated not by superoxide anion but by a more efficient primary oxidant. The quenching of chemiluminescence under the action of dimethyl sulfoxide shows that the hydroxyl radical also cannot be a primary oxidant. It is established that the effect the chelation of Fe II by EDTA has on chemiluminescence is not related to loss of the initiating action of Fe II EDTA in the luminol chemiluminescence. Instead, it is associated with its quick transformation into Fe III EDTA when preparing a mixture of Fe II and EDTA-Na 2 .

Conditions and ways of inhibiting, quenching, and subsequently restoring the chemiluminescence of luminol in alkaline aerated dimethyl sulfoxide are determined. Data are obtained that testify to the key role of electron transfer from luminol dianions to oxygen in the auto-oxidation and chemiluminescence of luminol under these conditions.

The complexes of meso-tetra(4-carboxyphenyl)porphyrin with nanoscale diamonds were studied by spectroscopic methods. The polarization characteristics of their steady-state fluorescence indicate the formation of a covalently bound complex between porphyrin molecules and diamond nanoparticles. Using the data of steady-state fluorescence anisotropy, the hydrodynamic volumes of the studied complexes were estimated. The measurements showed that the photophysical properties of porphyrin barely change upon the formation of an organic–inorganic hybrid complex with nanodiamonds. The studied complexes can be promising in the field of biomedical research, in particular, in diagnosing and developing a new generation of photosensitizers for practical medicine.

The joint chemiluminescence of luminol and lophine, initiated by active particles that are generated by the decomposition of hydrogen peroxide by hemin, is studied by spectral-kinetic recording.

Model studies on Coumarin 343–detonation nanodiamond complexes are described. The complexation of coumarin molecules with diamond nanoparticles due to covalent bonding leads to a considerable change in their spectral-luminescence properties, which makes it possible to distinguish between the behaviors of a free dye and a bound luminophore in the studied objects, in particular, in cell cultures. Experiments with an acute monocytic human leukemia culture show that the studied diamond nanocomplexes are easily captured by the cells and visualized in them; therefore, these complexes can be used to transport photocontrolled reagents and, ultimately, new drugs.

A solution of MnSO4 in dimethyl sulfoxide is obtained at a water concentration of 0.2–0.6 M. Most of the water molecules in this solution belong to the hydration shell of [Mn(OH)(H2O)5]+ · \({\text{HSO}}_{4}^{ - }\)(H2O)x ion pairs. The photooxidation of manganese to MnIII in the presence of an electron acceptor (oxygen or nitro blue tetrazolium) in the solution proceeds when the solution is irradiated with light at the wavelength corresponding to the absorption bands of MnII ions. The solution and its photochemical conversions are studied by means of spectroscopy, chemiluminescence, and conductometry. The photolysate is found to contain neither hydrogen peroxide nor free superoxide radical anions. The quantum yield for the photochemical generation of MnIII is determined for the light absorbed by MnII at the 6A1 → 4E, 4A1 band: 0.01 ± 0.002 mol/Einstein.

Mixing of an aqueous MnSO4 solution with liquid dimethyl sulfoxide leads to gelation and loss of fluidity of the mixture.

We have studied the feasibility of using luminophores in the coumarin series in luminescent filters for correcting the spectra of light-emitting diode (LED) light sources. Fine tuning of the emission spectra of luminophores in polymer matrices is achieved by introducing nonionic surfactants into the matrix. We propose a method for estimating the photostability of luminescent filters and we determine the photostability parameters.

The possibility of using phosphors of the coumarin series in luminescent converters for correcting spectra of LED light sources is investigated. Fine tuning of the emission spectra of phosphors in polymer matrices has been obtained by introducing nonionic surfactants into the matrix. A method for estimating the photostability of luminescent filters is proposed and the photostability parameters are determined.

The kinetics and mechanism of chemiluminescence during the reduction of manganese(IV) ions with lactic acid in an H 2 SO 4 –AcOH medium are studied. Kinetic spectrophotometric measurements are used to determine the profiles of change in the concentrations of Mn(IV) and Mn(III) ions during the reaction. The results from kinetic spectrophotometric measurements are compared to the light yield kinetics. The quantum chemiluminescence and chemiexcitation yields reach record values.

The effect of NaF and CH3CN on the chemiluminescent reactions of Mn(III) reduction in solutions of sulfuric acid is studied. It is established that NaF is an inhibitor of these reactions, and the quenching of chemiluminescence under the effect of NaF is nominal. Acetonitrile does not affect the kinetics of reactions under similar conditions and acts as a specific quencher of the chemiexcited emitter. The Stern-Volmer quenching constant is 52 ± 11 M−1.

Chemiluminescence is generated during reduction of manganese(III) ions with lactic acid to have a quantum yield as high as 0.1, a record-breaking chemi-excitation value for inorganic emitters. Kinetic features of the chemiluminescence and a nonradical mechanism of lactic acid oxidation lead to the conclusion that chemiexcitation results from two-electron reduction of manganese(IV) ions in the complex with lactic acid.

Chemiluminescence is generated in the reduction reactions of Mn(III) in sulfuric acid solutions; however, it is absent during the reduction of Mn(III) with iron(II) sulfate or potassium bromide. The dependences of the light yield and the kinetic parameters of chemiluminescence upon the concentration of reagents have been determined for the reactions of Mn(III) reduction with malonic acid. The rate of Mn(III) consumption during the light pathway of the reaction (i.e., reaction that results in chemiexcitation) depends on the squared Mn(III) concentration. The light pathway loses in competition with the dark pathway. The chemiexcitation of Mn2+ follows either one- or two-electron mechanism, but the complex character of the reaction does not allow making selection between these two routes.

Extracts from tissues of the holothuria Eupentacta fraudatrix suppress the oxy-chemiluminescence of ethylbenzene in chlorobenzene initiated by azobisisobutyronitrile thermolysis and enhanced by energy transfer to 9,10-dibromoanthracene. The decrease of the chemiexcitation rate in the reaction between peroxyl radicals is caused by radical interception by the antioxidants contained in the extracts. The concentrations of the antioxidants in the extracts and the rate constants of their reactions with peroxyl radicals have been estimated from chemiluminescence kinetics.

Chemiluminescence quantum yields for the reactions of permanganate with oxalic, tartaric, and citric acids; hydrazine; KBr; and FeSO4 in aqueous solutions of sulfuric acid have been measured. The maximum quantum yield reaches 1.2 × 10−5 einstein/mol with the chemiexcitation yield being 2%. Hence, the relatively low chemiluminescence quantum yield is due to a low yield of light emission by chemiexcited particles, rather than the low chemiexcitation yield.

Potassium permanganate reduction by citric acid in the presence of sulfuric acid includes stages of chemigeneration of electronically excited Mn(II) and emission of photons by it. The electronic absorption, reactant concentration, and chemiluminescence kinetics have been investigated. It has been shown that the chemiexcited species Mn(II) (chemiluminescence emitter) acts as a permanganate reduction catalyst.

An overview of literature on the procedures for the chemiluminescence determination of hydrogen peroxide is presented.

It is established that the photolysis of anthraquinone in both aerated and deoxygenated polymeric alcohols is not accompanied by reduction with the formation of anthrahydroquinone; as a result, an adduct of hydroxyanthracene and polymeric alcohol is formed.

The kinetics and stoichiometry of the formation of active oxygen (AO) in the acidic decomposition of trimeric (TATP) and dimeric (DADP) cyclic acetone peroxides are considered. Fe(III) produced as a result of Fe(II) oxidation with active oxygen has been determined using rhodanide procedure. The kinetics of the formation of active oxygen is described by a first order equation. The effective rate constant of TATP decomposition depends on the Hammett acidity function H 0 : log k eff = − H 0 − 2.6 ( k eff is in s −1 ). Consequently, the decomposition rate of TATP is limited by protonation. In the HCl and H 2 SO 4 concentration range from 0.006 to 2.9 mol/L, the decomposition of DADP occurs with k eff = 0.0010 ± 0003 s −1 at a Fe(II) concentration of 3.5 mmol/L and k eff depends linearly on the concentration of Fe(II).