Sinteza i karakterizacija meridijalnog izomera uns-cis-(etilendiamin-N-N'-di-propionato)(S-norleucinato)kobalt(III) hemihidrata

The meridional geometrical isomer of uns-cis-(ethylenediamine-N-N'-di-3-propionato)(S-norleucinato)cobalt(III) complex has been prepared by the reaction of sodium uns-cis-(ethylenediamine-N-N'-di-3-propionato)(carbonato)cobaltate(III) with S-norleucine at 75 degrees C. The complex was isolated choromatographically and characterized by elemental analyses, electron absorption and infrared spectroscopy.Sintetisan je i okarakterisan meridijalni izomer uns-cis-(etilendiamin-N-N'-di-3-propionato)(S-norleucinato)kobalt(III) hemihidrat. Kompleks je dobiven reakcijom natrijum-uns-cis-(etilendiamin-N-N'-di-3-propionato)kobaltata(III) dihidratai S-norleucina na 75 ºC. Kompleks je izolovan hromatografski i okarakterisan elementalnom analizom, elektronsko-apsorpcionom i infracrvenom spektroskopijom

Sinteza i karakterizacija tris [butil-(1-metil-3-fenil-propil)-ditiokarbamato]-kobalt(III) seskvitoluena

A new bidentate ligand butyl-(1-methyl-3-phenyl-propyl)-dithiocarbamate (bmPhipdtc) was prepared, as the sodium salt. In the reaction of hexaaminecobalt(III) chloride with NabmPhipdtc, the corresponding tris[butyl-(1-methyl-3-phenyl-propyl)-dithiocarbamato]cobalt(III), [Co(bmPhipdtc)(3)] complex was prepared. The complex was characterized by elemental analysis, infrared, electronic absorption, H-1 and C-13-NMR spectroscopy.Sintetisan je novi bidentatni ligand butil-(1-metil-3-fenil-propil)-ditiokarbamat (bmΦpdtc), kao natrijumova so. Reakcijom heksaamminkobalt(III)-hlorida i navedenog liganda dobijen je odgovarajući kompleks tris[butil-(1-metil-3-fenil-propil) ditiokarbamato]kobalt(III), [Co(bmΦpdtc)3]. Kompleks je okarakterisan elementalnom analizom, infracrvenim, elektronsko-apsorpcionim, 1H i 13C-NMR spektrima

Ethylenediammonium aquabis(malonato)oxovanadate(IV)

In the anion of the title compound, (C2H10N2)[VO(H2O)(C3H2O4)(2)] or H(2)en[VO(mal)(2)H2O], vanadium(IV) is distorted-octahedrally coordinated by six donor O atoms. The two malonate ligands are situated in the equatorial plane, whereas the oxo and the water ligand occupy axial positions. The apical V=O bond exhibits a strong trans influence. The anion possesses crystallographically imposed C-2 symmetry, with the central V atom, the oxo and the water ligand lying on the twofold axis

Distribucija i forme gvožđa u vertisolima Srbije

Soil of arable land and meadows from the Ap horizon, taken from ten different localities, were investigated for different forms of Fe, including total (HF), pseudo-total (HNO3), 0.1 M HCl extractable and DTPA (diethylenetri-aminepentaacetic acid)-extractable. A sequential fractional procedure was employed to separate the Fe into fractions: water soluble and exchangeable Fe (I), Fe specifically adsorbed with carbonates (II), reducibly releasable Fe in oxides (III), Fe bonded with organic matter (IV) and Fe structurally bonded in silicates (residual fraction) (V). The soil pH, cation exchange capacity, and size fractions (clay and silt) had a strongest influence on the distribution of the different forms of Fe. The different extraction methods showed similar patterns of the Fe content in arable and meadow soils. However, the DTPA iron did not correspond with the total iron, which confirms the widespread incidence of iron-deficiency in vertisols is independent of the total iron in soils. The amount of exchangeable (fraction I) and specifically adsorbed (II) iron showed no dependence on its content in the other fractions, indicating low mobility of iron in vertisols. The strong positive correlation (r = 0.812 and 0.956) between the content of iron in HNO3 and HF and its contents in the primary and secondary minerals (fraction - V) indicate a low content of plant accessible iron in the vertisol. The sequential fractional procedure was confirmed as suitable for accessing the content and availability of iron in the vertisols of Serbia.U cilju određivanja različitih oblika gvožđa u nekim varijetetima vertisola sa područja Srbije (oranice i livade) poreklom sa deset različitih lokaliteta analiziran je ukupan sadržaj gvožđa (HF), pseudo-ukupan sadržaj (HNO3), 0,1 M HCl rastvorljivo i DTPA rastvorljivo gvožđe. Sekvencijalnom ekstrakcijom izvršeno je razdvajanje frakcija gvožđa na rastvorljivo u vodi i razmenljivo Fe (I), specifično absorbovano gvožđe sa karbonatima (II), okludovano Fe u oksidima (III), Fe vezano za organsku materiju (IV) i Fe strukturno vezano u silikatima (rezidualni deo, V). pH vrednost zemljišta, CEC i veličina frakcija (glina i prah) imali su značajan uticaj na distribuciju različitih oblika gvožđa. Različite metode ekstrakcije su pokazale sličan oblik sadržaja Fe u obradivom zemljištu i livadi. Međutim, sadržaj DTPA rastvorljivog gvožđa ne odgovara ukupnom sadržaju, što potvrđuje da je učestalost nedostatka gvožđa u vertisolima na području Sr- bije nezavisna od ukupnog gvožđa u zemljištima. Iznos razmenljivog gvožđa (frakcija I) i adsorbovovanog (II) gvožđa nije pokazala zavisnost od njegovog sadržaja u drugim frakcijama, što ukazuje na nisku mobilnost gvožđa u proučavanim vertisolima. Jaka pozitivna korelacija (r = 0,812 i 0,956) između sadržaja gvožđa u HNO3 i HF i njegov sadržaj u primarnim i sekundarnim mineralima (frakcija V) pokazuju nizak nivo gvožđa dostupnog biljkama u ispitivanim vertisolima. Korišćenjem sekvencijalne ekstrakcije moguće je utvrditi sadržaj i pristupačnost gvožđa u vertisolima Srbije

Sinteza i karakterizacija kompleksa cink(II), kadmijum(II), platina(II),i paladijum(II) sa kalijum-3-ditiokarboksi-3-aza-5-aminopentanoatom

Complexes of zinc(lI), cadmium(II). platinum(lI) and palladium(II) with a new poly-dentate dithiocarbamate ligand, 3-dithiocarboxy-3-aza-5-aminopentanoate (daap(-)), of the type M(daap)(2).nH(2)O (M = Zn(II), Cd(II), n = 2, or M = Pt(II) Pd(II) n = 0). have been prepared and characterized by elemental analysis. IR and UV/VIS spectroscopy, as well as magnetic measurements. The spectra of the complexes suggest a bidentate coordination of the daap- ligand to the metal ions via the sulfur atoms of the deprotonated dithiocarbamato group. The fact that under the same experimental conditions its S-methyl ester does not form complexes could be taken as proof of the suggested coordination mode.Reakcijom između cink(II), kadmijum(II), platina(II) i paladijum(II)-soli i kalijum- 3-ditiokarboksi-3-aza-5-aminopentanoata dobijeni su dogovarajući kompleksi tipa M(daap)2.nH2O. Izolovani kompleksi su okarakterisani elementarnom analizom, IR i UV/VIS spektroskopijom kao i merenjem magnetnih susceptibiliteta. Spektri kompleksa sugerišu bidentatnu koordinaciju daap liganda sa navedenim metalnim jonima preko atoma sumpora deprotonovane ditiokarbamato grupe. Kao dokaz navedenog načina koordinacije može poslužiti činjenica da pri istim eksperimentalnim uslovima S-metil estar liganda ne daje komplekse

Sinteza i karakterizacija nikal(II) i bakar(II) kompleksa sa polidentatnim dialkil ditiokarbaminskim ligandom 3-ditiokarboksi-3-aza-5-aminopentanoatom

Square planar complexes of Ni(II) and Cu(II) with potassium 3-dithiocarboxy-3-aza-5-aminopentanoate have been prepared by direct synthesis. The obtained neutral complexes were characterized by elemental analysis, magnetic susceptibility measurements, infrared and electronic spectra. The thermal behaviour of both the Ni(II) and Cu(II) complexes, and the ligand itself was investigated by DSC and TG.Direktnom sintezom između nikal(II)- i bakar(II)- soli i kalijum 3-ditiokarboksi-3-aza-5-aminopentanoata nagrađeni su odgovarajući kompleksi kvadratno-planarne strukture. Izolovani neutralni kompleksi karakterisani su elementalnom analizom, infracrvenom i elektronskom apsorpcionom spektroskopijom, kao i merenjem magnetnih susceptibiliteta. Termičko ponašanje kompleksa i liganda ispitivano je primenom DSC i TG metoda

Distribucija i forme mangana u vertisolima Srbije

Soil samples taken from the Ap horizont of arable land and meadows at ten different localities were analyzed for different forms of manganese, including total (HF), pseudo-total (HNO3), 0.1 M HCl-extractable and diethylentriaminepentaacetic acid (DTPA)-extractable. A sequential fractional procedure was used for Mn portioning into fractions: water soluble and exchangeable Mn (I), specifically adsorbed Mn with carbonates (II), reductant releasable Mn in oxides (III), Mn bonded with organic matter (IV) and Mn structurally bonded in silicates (residual fraction) (V). Serbian vertisols have a normal Mn content, comparable with similar soils. The total (HF) and pseudototal (HNO3) Mn contents were not correlated with soil properties, whereas the humus content positively influenced the 0.1 M HCl-extractable Mn in soil (r = 0.49). Soil pH and CaCO3 (r = 0.57 and 0.43) showed significant negative correlations with the DTPA-extractable Mn, respectively. The different extraction methods showed similar patterns of Mn content in arable and meadow soils. The sequential fractional procedure showed that reductant releasable Mn occluded in oxides of Fe and Mn was the prevailing Mn fraction in soil, however, water soluble and exchangeable Mn and Mn bonded with organic matter had significant correlations with most of the examined soil characteristics. Potential Mn toxicity in vertisols could be observed under lower pH and saturated conditions.U cilju određivanja različitih oblika mangana u vertisolima sa područja Srbije (oranice i livade) poreklom sa deset različitih lokaliteta analiziran je ukupan sadržaj mangana (HF), pseudo-ukupan sadržaj (HNO3), 0,1 M HCl rastvorljiv i DTPA rastvorljiv mangan. Sekvencijalnom ekstrakcijom izvršeno je razdvajanje frakcija mangana na rastvorljiv u vodi i razmenljiv mangan (I), specifično adsorbovan sa karbonatima (II), okludovan u oksidima (III), mangan vezan za organsku materiju (IV) i mangan strukturno vezan u silikatima (rezidualni deo) (V). Sadržaj mangana u analiziranom zemljištu (vertisol) poređen je sa dobijenim rezultatima na sličnim zemljištima. Ukupan sadržaj mangana (HF) i pseudo-ukupan sadržaj (HNO3) nisu bili u korelaciji sa ispitivanim svojstvima zemljišta, dok je sadržaj humusa pozitivno uticao na 0,1 M HCl rastvorljiv mangan(r = 0,49). Zemljišni pH i CaCO3 (r = 0,57 i 0,43) su pokazali visoko značajnu negativnu korelaciju sa DTPA rastvorljivim manganom. Različita ekstrakciona sredstva su ispoljila sličan efekat na sadržaj Mn u obradivom zemljištu i livadama. Sekvenciona ekstrakciona analiza je pokazala da mangan okludovan u oksidima čini procentualno najveću frakciju u zemljištu, istovremeno postoje statistički značajne korelacije između mangana rastvorljivog u vodi i mangana vezanog za organsku materiju i većine svojstava zemljišta. Potencijal ekotoksičnosti mangana se može ispoljiti samo u slučajavima niske pH vrednosti zemljišta i pojave zasićanja zemljišta sa vodom

Distribution and forms of iron in the vertisols of Serbia

Soil of arable land and meadows from the Ap horizon, taken from ten different localities, were investigated for different forms of Fe, including total (HF), pseudo-total (HNO3), 0.1 M HCl extractable and DTPA (diethylenetriaminepentaacetic acid)-extractable. A sequential fractional procedure was employed to separate the Fe into fractions: water soluble and exchangeable Fe (I), Fe specifically adsorbed with carbonates (II), reducibly releasable Fe in oxides (III), Fe bonded with organic matter (IV) and Fe structurally bonded in silicates (residual fraction) (V). The soil pH, cation exchange capacity, and size fractions (clay and silt) had a strongest influence on the distribution of the different forms of Fe. The different extraction methods showed similar patterns of the Fe content in arable and meadow soils. However, the DTPA iron did not correspond with the total iron, which confirms the widespread incidence of iron-deficiency in vertisols is independent of the total iron in soils. The amount of exchangeable (fraction I) and specifically adsorbed (II) iron showed no dependence on its content in the other fractions, indicating low mobility of iron in vertisols. The strong positive correlation (r = 0.812 and 0.956) between the content of iron in HNO3 and HF and its contents in the primary and secondary minerals (fraction – V) indicate a low content of plant accessible iron in the vertisol. The sequential fractional procedure was confirmed as suitable for accessing the content and availability of iron in the vertisols of Serbia

Supplementary data for the article: Stojković, D. L. J.; Bacchi, A.; Capucci, D.; Milenković, M. R.; Čobeljić, B.; Trifunović, S. R.; Andelković, K.; Jevtić, V. V.; Vuković, N.; Vukić, M.; et al. Synthesis and Characterization of Palladium(II) Complexes with Glycine Coumarin Derivatives. Journal of the Serbian Chemical Society 2016, 81 (12), 1383–1392. https://doi.org/10.2298/JSC160915087S

Supplementary material for: [https://doi.org/10.2298/JSC160915087S]Related to published version: [http://cherry.chem.bg.ac.rs/handle/123456789/2392

Synthesis of new seven membered heterocyclic rings: An easy access to indeno-benzo[1,4]diazepines

An easy access has been demonstrated for seven membered diazepines and a six membered quinoxaline. The reaction proceeds rapidly with low-cost and readily available chemicals at mild temperature and provides straight forward access to diazepines and quinoxaline. All final products are new and confirmed by spectral analysis and by single crystal X-ray analysis. Two crystal structures of the diazepines have very similar compositions, exhibit similar conformations where four condensed and coplanar rings are placed in the same orientation to the rest of molecule