[en] The magnetic behaviors of Co(II) complexes of N,N’-bis(3,5-di-tert-butylsalicylidene)-1,2-cyclohexanediaminato, N,N’-bis(3-chlorosalicylidene)-1,2-cyclohexanediaminato, N,N’-bis(3,5-dichlorosalicylidene)-1,2-cyclohexanediaminato, (3-nitrosalicylidene)-1,2-cyclohexanediaminato, N,N’-bis(3,5-dinitrosalicylidene)-1,2-cyclohexanediaminato, and N,N’-diaminomaleonitrilebis(salicylideniminato) were studied to identify the presence molecular tristability that is observed for the parent Co^IIsalen (salen = ethylenebis(salicylideniminato)). N,N’-bis(3,5-dinitrosalicylidene)-1,2-cyclohexane-diaminato(2-)cobalt(II) exhibited tristable behavior similar to Co^IIsalen, and it is anticipated to have a dimeric structure.

No abstract available

[en] Regiodivergent 1,2-hydroboration of 1,3-dienes with pinacolborane has been accomplished by well-defined cobalt complexes of different bidentate ligands. The iminopyridine-cobalt system is selective for Markovnikov 1,2-hydroboration to form allylboronates, while the FOXAP-cobalt (FOXAP=(S)-1-(diphenylphosphino)-2-[(S)-4-isopropyloxazolin-2-yl]ferrocene) catalyst effects the complementary anti-Markonikv 1,2-hydroboration to afford homoallyboronates with high regioselectivity.

[en] The formation of gaseous products of the gamma radiolysis of benzene in the presence of Co(acac)₂ was studied, and the radiation-chemical yields of hydrogen, acetylene methane, and ethylene were determined. Spectrophotometric data showed that, as a result of irradiation, oxidation of the additive occurred, with formation of cobalt(III) complexes. Yields of biphenyl and phenylcyclohexadienes were determined in these benzene solutions, and also in systems containing Co(acac)₂ with 18-crown-6. Possible mechanisms of the processes taking place are discussed. 10 refs., 2 tabs

[en] In this study, the results obtained with different cobalt and nickel glyoximes are presented. These complexes have been characterized by various spectroscopies (UV-visible, ESR) and by electrochemistry (cyclic voltametry, spectro-electrochemistry). Their efficiency to electrochemically reduce the protons into dihydrogen in acid medium is discussed. More particularly, studies on solid support are carried out. At last, these complexes are being tested inside PEM electrolysis. (O.M.)

[en] We have investigated the structural, electronical, optical and thermoelectric properties of Cobalt phthalocyanine polymer, CoPc, by using the full potential linearized augmented plane wave (FP-LAPW) method. The energy band structure of CoPc shows that this compound has an indirect band gap with two deep trap bands which have strong influence on the optical and thermoelectric properties. Achieved optical spectra are in close agreement with the experiment. Seebeck coefficient and dimensionless figure of merit are 1711.6 (μV/K) and 3.23, respectively. The results show that CoPc polymer can be used in the optical and thermoelectric devices.

No abstract available

[en] Published in summary form only

[en] The invention concerns the rendering of hypoxic cells more sensitive to irradiation by treatment with a Co(III) to Fe(III) co-ordination compound selected from the group consisting of- (1) compounds having the formula: [CoN_nX_6-n]^y where n has a value of 3 or 4; N is an uncharged nitrogen donor atom that is contained in a ligand; X represents an anionic ligand; and y represents the charge on the complex; (2) compounds having the formula: [CoA₂X¹D]^y1 where A represents a bidentate or tetradentate negative ligand containing N or O donor atoms; X¹ and D represent the same or different monodentate ligands; and y¹ represents a positive or negative charge on the complex; (3) compounds having the formula: [CoZ₃] where Z represents a chelating mononegative ligand; and (4) Compounds of the formula: [FeTT¹]⁺ where T and T¹, which may be the same or different, represent mononegative tridentate ligands

No abstract available