[en] Submicro amounts of iodide can be demonstrated using bathopenanthroline. (author)

[en] The new complex compound [V O(Bipy)₂(H₂O)]B₁0H₁0 H₂O have been synthesised and their properties have investigated. IR spectroscopic methods has suggested that 1.10-phena troline molecules located at the intra sphere, but anions located in the external sphere of complex

[en] Complete text of publication follows. It is well established that certain types of chemical reactions, subject to appropriate conditions, organize themselves spontaneously to give rise to regular spatial patterns or to periodic rate fluctuations. In this work, the effects of non-aqueous solvents, non-ionic, cationic, and anionic surfactants, complexing agents, and organic base on the behavior of the 1, 10 phenanthroline chemiluminescence (CL) oscillating system were investigated. Oscillating CL produced by the addition of 1,10-phenanthroline to the oscillating system H2O2-KSCN-CuSO4-NaOH was investigated using luminometry method in a batch reactor. In the presence of solvent with high basicity compare to water, tetrahydrofuran (THF), the CL intensity was increased (11 fold), the light emitting and oscillating time was enhanced by 2-fold. In addition, the effect of surfactant, in the concentration range of 0.3-1.5 m/v, on oscillatory system was investigated. Non-ionic and anionic surfactants including triton X-100, triton X-114, brij 35 and sodium dodecyl sulfate (SDS) increased the intensity of the oscillating CL reaction by 32, 5, 10 and 6-folds, respectively. The effects of complexing agents including such as ethylenediaminetetraacetic acid (EDTA) and triethylenetetraamine (TETA) on oscillating CL system were investigated. The oscillating CL with organic base was also studied. Results indicated that using tetramethylammonium hydroxide, TMAOH, causes regular oscillating CL with nearly the same oscillating period compare to NaOH.

[en] A continuous flow system has been developed to determine trace Cu(II), Mn(II), Ni(II) and Zn(II) in a large volume of water samples by a solvent sublation technique. The mixed solution of 1,10-phenanthroline(phen) and thiocyanate ion was used as ligands for the formation of their ternary complexes. The continuous system was constructed in this laboratory with a peristaltic pump, a mini shaker, three mixing bottles and a flotation cell by connecting each part with a polyethylene tube. The flotation conditions such as the flow rate of sample solution and the injection rates of ligand, buffer and surfactant solutions have been investigated to obtain the best sublation efficiencies. Each solution flowed into the flotation cell through each polyethylene tube by the peristaltic pumps. The ternary complexes were floated and extracted into MIBK in a flotation cell of 2 L by bubbling a nitrogen gas. The absorbances of extracted analytes in MIBK were directly measured by graphite furnace-AAS. The concentrations of 1,10-phenanthroline and thiocyanate ion were 2.6 x 10^-3 M and 2.3 x 10^-2 M in the mixed solution, respectively. The pH of sample solution was adjusted to 5.0 with a buffer solution and 1%(m/v) sodium lauryl sulphate solution was added as a surfactant to support the effective flotation of the complexes. The N₂ gas was bubbled at 30 mL/min for 90 minutes for 20 L of sample. Reproducible results of less than 10% RSD and recoveries of 80-120% could be obtained in real samples

No abstract available

[en] The complexes [(L)₂MnO₂Mn(L)₂]³⁺ where L = 2,2'-bipyridine or 1,10-phenanthroline, have been examined, in addition to the corresponding (IV, IV) complex of phenanthroline. The crystal structure of the mixed valence (III, IV) compound with L = 2,2'-bipyridine demonstrated that this complex has deeply trapped valences, corresponding to class II in the classification of Robin and Day since the bond lengths differ considerably about the manganese ions. We have examined the electronic spectrum of the (III, IV) complexes and observed broad bands in the near infrared which we have assigned to the mixed valence band expected for a class II system. No comparable band is observed for the phenanthroline (IV, IV) complex. Lowering the pH of (III, IV) dimer solutions reversibly cleaves the antiferromagnetically coupled (III, IV) dimers as determined by the increase in solution magnetic susceptibility; loss of the near infrared band occurs with dimer cleavage, although the remainder of the visible spectrum is substantially unaltered. Both absorbance and solution magnetic susceptibility changes with pH are reversible. The solvent dependence of the near infrared band is small but apparently opposite to that predicted by Hush's theory. However, the bandwidths agree well with those predicted from Hush's treatment (e.g., 0.53 μm^-1 predicted, 0.46 μm^-1 observed). A band at 688 cm^-1 in the infrared spectrum of the bipyridyl (III, IV) dimer is shifted by isotopic substitution with ¹⁸O, and has been assigned to one of the stretching modes of the Mn₂O₂ bridge; analogous bands are found for the phenanthroline (III, IV) and -(IV, IV) complexes. Pertinent aspects of the electrochemistry are also discussed

[en] The present report describes the method to determine micro quantities of iron in plutonium, by extraction with hexyl alcohol of the complex that give iron (II) with bathophenanthroline (4,7 diphenyl - 1.10 phenanthroline). The reagent has been applied to the determination of amounts of iron ranging from 1 to 10 μg in 20 ml of solvent The determination is made by spectrophotometry at 530 mμ. Others cations present do not interfere. (authors)

[en] Separation of lanthanides from actinides is essential for an efficient management of high level nuclear wastes, and therefore complexation study of f-block elements with various ligands is an important area of research. Selective extraction of actinides over lanthanides by phenanthroline based ligands can be studied by computing the structures, various properties and complexation energies through density functional theory. Here our objective is to study the effect of incorporation of additional nitrogen atoms in the phenanthroline moiety of 1,10-phenanthroline 2,9-dicarboxylic acids towards the selective complexation of actinides in presence of lanthanides. Four trivalent ions, viz., Ce(III), Eu(III), U(III) and Am(III) are considered in this study. (author)

[en] Solvent extraction of Eu(III) and Nd(III) from aqueous medium was investigated by sulfasalazine in benzoyl alcohol as single extractant and then with synergic mixture of sulfasalazine and 1,10-phenanthroline in benzyl alcohol. The synergic mixture was found to extract studied rare earth elements with higher distribution coefficients. All cations studied have shown negligible effect on the extraction, whereas citrate and oxalate interfered seriously. The stoichiometric composition of extracted species was found to be M (SS)₂.HSS.X and [M(SS)₃.2phen] where M = Eu(III) and Nd(III). The extraction mechanism is also discussed. The extractant has high loading as well as recycling capacity without any degradation. (author)

[en] In the present work investigated the complex formation of Mn(II) withneutral heterocyclic N-donor ligand-1,10-phenanthroline at the presence ofpolyhedral borane anions