Provider: - Institution: - Data provided by Europeana Collections- Reakcijom srebrova(I) nitrata s mono- i dihalogen derivatima piridina u molarnom omjeru 1 : 2 u smjesi vode i alkohola priređeno je ...12 novih kompleksa srebra(I) opće formule Ag(NO3)(Xnpy)2, X = Cl, Br, I; n = 1 – 2. Pripravljeni kompleksni spojevi identificirani su pomoću elementne analize, dok je njihova struktura u otopini okarakterizirana tehnikama višenuklearne spektroskopije NMR (1H, 13C, 15N, 109Ag) i spektrometrije masa. Kompleksi su u čvrstom stanju okarakterizirani spektroskopijom IR, a kristalna i molekulska struktura im je određena metodama rentgenske strukturne analize.
Molekule liganda su u svim kompleksima na srebrov(I) ion vezane preko atoma dušika piridinskog prstena. U koordinacijskoj sferi srebra(I) dokazan je i nitratni ion koji ovisno o načinu koordiniranja na srebro omogućava stvaranje koordinacijskih polimera ili supramolekulskih struktura. Koordinacijski broj srebra kod sintetiziranih spojeva varira između tri, četiri, pet ili šest i to čak ponegdje i unutar istog spoja. Pored kovalentnih veza, Ag–N i Ag–O, u strukturama su pronađene i nekovalentne interakcije (vodikove i halogenske veze te π···π interakcije) koje pridonose konačnoj dimenzionalnosti spoja. Slaba veza Ag–Ag otkrivena je u kompleksu s 3-Ipy kao ligandom. Priređeni spojevi pokazuju bolju antibakterijsku aktivnost u uvjetima in vitro spram Gram-negativnih nego spram Gram-pozitivnih bakterijskih vrsta.- Twelve 1:2 complexes of silver(I) nitrate with mono- and dihalopyridine of the general formula Ag(NO3)(Xnpy)2, X = Cl, Br, I; n = 1–2, were prepared by reaction of AgNO3 and corresponding pyridine derivative in water-alcohol solution. All synthesized complexes were identified by elemental analysis and characterized in solution by multinuclear NMR spectroscopy (1H, 13C, 15N, 109Ag) and mass spectrometry. In solid state the complexes were characterized by IR spectroscopy, while their crystal and molecular structures were revealed by single crystal X-ray analysis.
It was established that in all complexes, besides pyridine nitrogen atoms, the oxygen atoms belonging to nitrate ion are also coordinated to silver ion thus providing not only different coordination numbers of Ag(I) which vary from three, four, five and six but also a formation of coordination polymers or supramolecular structures. It is interesting that in the molecule of one complex, which is dinuclear, there are even two differently coordinated silver ions (3, 4). Beside covalent Ag–N and Ag–O bonds present in complex molecules, there are various non-covalent interactions such as hydrogen bonding, halogen bonds and halogen-halogen interactions thus contributing to final dimensionality. Moreover, a weak Ag–Ag bonding was determined in complex with 3-Ipy as a ligand. In vitro tests of all complexes gave better antibacterial activity against Gram-negative than Gram-positive strains.- All metadata published by Europeana are available free of restriction under the Creative Commons CC0 1.0 Universal Public Domain Dedication. However, Europeana requests that you actively acknowledge and give attribution to all metadata sources including Europeana
Provider: - Institution: - Data provided by Europeana Collections- All metadata published by Europeana are available free of restriction under the Creative Commons CC0 1.0 Universal Public Domain ...Dedication. However, Europeana requests that you actively acknowledge and give attribution to all metadata sources including Europeana
Od panonsko-dalmatinskih rudnika srebra, kao uostalom i rudnika željeza, uvelike je ovisila obrana rimskog limesa u Podunavlju. Stoga ne iznenađuje činjenica da je rimska država ove rudnike, osobito ...rudnike srebra, strogo nadzirala i nastojala osigurati njihovu eksploataciju i u najtežim vremenima. Inače na panonsko-dalmatinskim prostorima srebro je intenzivno eksploatirano od početka 2. st. pa do propasti Zapadnog Rimskog Carstva. Nerijetko je proizvodnja nastavljena i tijekom srednjega vijeka.
U članku se donosi i interpretira dokument od 18. II. 1493., koji je prvi poznati zapis o zakopanom blagu u Hrvatskoj. Iz njega se saznaje da su četiri težaka iz sela Prosik kraj Solina pronašla ...ostavu vjerojatno antičkog posuđa, što je prvi signal postojanja takvih ostava na jugu antičke Dalmacije. Premda dokument ne daje odgovor na pitanja o okolnostima nalaza, obliku i dataciji posuđa, pronađeni predmeti (a čini se da seljaci nisu prijavili sve što su otkopali) mogli su biti od važnosti kad ih je splitski knez pozvao preda se zajedno s njihovim sinovima i unucima.
Provider: - Institution: - Data provided by Europeana Collections- Šećernica s dvije uglate drške.- All metadata published by Europeana are available free of restriction under the Creative Commons ...CC0 1.0 Universal Public Domain Dedication. However, Europeana requests that you actively acknowledge and give attribution to all metadata sources including Europeana
Dekretom cara Petra Velikog iz 1700. godine propisano je da se nakon izrade predmeta od kovine, isti moraju odnijeti ovlašenom ispitivaču na provjeru i pečatiranje. Ovlašteni ispitivač nakon provjere ...materijala na predmet utiskuje tri svoja pečata: pečat ispitivača (Assayer's Mark), pečat oznake čistoće srebra (Silver Standard Mark) i pečat grada (City Mark). Sam majstor srebrnar uz te pečate stavlja i svoj pečat - pečat proizvođača (Maker's Mark). Iz tih pečata može se saznati iz kojega grada i zemlje potječe izrađeni predmet, godina izrade, čistoća upotrijebljenog materijala te ime majstora srebrnara koji je djelo izradio.
Provider: - Institution: - Data provided by Europeana Collections- PL: Metalowa taca (wykonana ze stopu wysokoniklowego, zwanego nowym srebrem lub alpaką) z motywami chińskimi. ...(Pełen opis ...dostępny na stronie www.pictures-bank.eu). Autorem zdjęcia jest Piotr Kożurno. Autorzy opisu: Piotr Kożurno- All metadata published by Europeana are available free of restriction under the Creative Commons CC0 1.0 Universal Public Domain Dedication. However, Europeana requests that you actively acknowledge and give attribution to all metadata sources including Europeana
Provider: - Institution: - Data provided by Europeana Collections- PL: Metalowa taca (wykonana ze stopu wysokoniklowego, zwanego nowym srebrem lub alpaką) z motywami chińskimi. ...(Pełen opis ...dostępny na stronie www.pictures-bank.eu). Autorem zdjęcia jest Piotr Kożurno. Autorzy opisu: Piotr Kożurno- All metadata published by Europeana are available free of restriction under the Creative Commons CC0 1.0 Universal Public Domain Dedication. However, Europeana requests that you actively acknowledge and give attribution to all metadata sources including Europeana
Provider: - Institution: - Data provided by Europeana Collections- PL: Metalowa taca (wykonana ze stopu wysokoniklowego, zwanego nowym srebrem lub alpaką) z motywami chińskimi. ...(Pełen opis ...dostępny na stronie www.pictures-bank.eu). Autorem zdjęcia jest Piotr Kożurno. Autorzy opisu: Piotr Kożurno- All metadata published by Europeana are available free of restriction under the Creative Commons CC0 1.0 Universal Public Domain Dedication. However, Europeana requests that you actively acknowledge and give attribution to all metadata sources including Europeana
Greensburg police accused Sherrie Fabean, 46, of 202 N. Third St., West Newton, of failing to supply required care to patient Joann Srebro for about 14 hours Jan. 25, making stitching of the gash on ...her right leg impossible and requiring more elaborate treatment and plastic surgery. Fabean's attorney, William Wiker, of Greensburg, told District Judge James Albert, of Greensburg, that the prosecution had failed to show that Fabean "intentionally, knowingly or recklessly" failed to provide care. Patricia Gallagher, Redstone director of nursing, testified that Fabean called her about 9 p.m. to discuss the wound.
