ON THE DIOXIMINE COMPLEXES OF TRANSITION METALS, Part XC NEW AZIDO-COMPLEX ACIDS OF COBALT(III) WITH ALICYCLIC α-DIOXIMES

Four new diazido-complex acids of the type H[Co(Diox.H)2(N3)2] (Diox.H2 = alicyclic α-dioximes: Cpdox.H2, Niox.H2, Heptox.H2 and Octox.H2) and the H[Co(Niox.H)2(N3)(NO2)] were obtained by air oxidation of the components and by sub- stitution reactions. The free acids and their salts were characterized by IR and electronic spectra and by potentiometric measurements. The composition of the azido-derivatives was proved also by isolation of 30 new salts with cobalt(III)- and chromium(III)- amine bases

POLAROGRAPHIC BEHAVIOUR OF SOME COBALT(III) COMPLEXES WITH ETHYLENEDIAMINE

The polarographic behaviour of various cobalt(III)-amine complexes with ethylenediamine were studied in Britton-Robinson buffer solutions and also in the presence of 1,2-cyclohexane dione dioxime. It was observed that the cobalt(III)-amine complexes, generally, are reduced in two steps. The first wave (Co(III) -> Co(II)) has an irreversible character, the second one corresponds rather to a Co(II)-ligand -> Co(0) step, than to a . [Co(H20)6]2+ -> Co(0) reduction, as presumed earlier. In the presence of dioximes the hexamine and monoacidopentamine type cobalt(llI) complexes do not undergo substitution reactions under the above mentioned experimental conditions

ON THE DIOXIMINE COMPLEXES OF TRANSITION METALS. XCI. POLAROGRAPHIC STUDIES ON VARIOUS TYPES OF DIOXIMINE COMPLEXES OF COBALT(III)

The polarographic behaviour of some dioximine chelates of cobalt(III) (α-dioxime: Diox.H2, DH2-dimethylglyoxime, Nyox.H2=nyoxime, Heptox.H2=heptoxime ):[Co(DH)2 (amine)2]+, [Co(Nyox.H)2(amine)2]+, [Co(Diox.H)2XY]-(X, Y=Cl, Br, I, N02, N3, CN), [Co(DH)2(S03)(amine)]-, (alkyl-Co(DH)2 (amine) were studied at various pH-values (cathodic reductions and in some cases also anodic oxidations). The Co(II)-nyoxime system and the formation of [Co(Diox.H)2en]- by the substitution reactions of 1,2- and 1,6-[Co(en)2CI2]+ and [Co(en)CI(H20)]2+ with α-dioximes were studied in this way

ON THE OXIMINE COMPLEXES OF TRANSITION METALS. PART CXVIII. STUDY ON THE PROTOLYTIC EQUILIBRIA IN THE SOLUTIONS OF MIXED CHELATES OF THE TYPE [Co(Diox.H)2AB]n WITH ALICYCLIC α-DIOXIMES1

16 new chelate compounds of the type [Co(Diox.H)2AB]n (Diox.H2-alicyclic α-dioxime with C5..C8 in the hydroaromatic ring, A, B monodentate ligands: NCO-, NO2-, S2O32-, NH3, pyridine, aromatic amine) were obtained by air oxidation of the components and by various substitution reactions, respectively. The complexes were characterized by FTIR spectra. The complicated protolytic equilibria with the participation of the intramolecular O-H..O hydrogen bridges of the Co(Diox.H)2 moieties were studied by spectrophotometric and potentiometric measurements

Thibault and Science I. Measure, Distances and Proportions in the Circle

In this paper we investigate the basic mathematical and philosophical tool of Gérard Thibault d’Anvers, the Circle. One of our main goals was to describe the Circle with coordinate geometry, and to estimate the rate of accuracy of his work. Furthermore, we also wanted to test the statements made by Thibault in his fencing manual, Academy of the Sword [Thibault, 1630; Greer, 2005]. To do this, we compared his observations and calculations with the results of available modern day and historical anthropometrical data sets. Based on our results, we also want to give some practical information about Thibault system for the fencers who study his art in our time

Esélyteremtés a könyvtárakban

2003-ban, a “fogyatékkal élők európai évében“ a könyvtárak is bekapcsolódtak az esélyegyenlőség megteremtésébe. Egyik fő céljukká vált, hogy a fogyatékkal élők minden csoportját megfelelő információkkal lássák el. A közgyűjtemények – az érintett csoportok bevonásával és partnerkapcsolatok kialakítával – felhasználják mindennapi munkájukban a technikai újdonságokat. A könyvtárak számos új szolgáltatást vezettek be a hátrányos helyzetűek számára, speciális eszközökkel és dokumentumokkal segítve önálló ismeretszerzésüket. A tanulmány ezekről számol be, kitérve az ún. házon kívüli szolgáltatásokra és a könyvtári dolgozók speciális tanfolyamok keretében történő továbbképzésére is. Rámutat, hogy nem minden könyvtár rendelkezik megfelelően akadálymentes környezettel, speciális eszközparkkal és alternatív formátumú dokumentumokkal. 2005-ben zárult le az ellátottság feltárására indult kérdőíves felmérés, melynek eredményeit és tapasztalatait összegzi a szerző, megjelölve a további fejlesztés célszerű irányait is