Advanced search in
Research products
arrow_drop_down
Searching FieldsTerms
Any field
arrow_drop_down
includes
arrow_drop_down
Include:
1,475 Research products, page 1 of 148

  • 2012-2021
  • Open Access
  • HR
  • Kemija u Industriji

10
arrow_drop_down
Relevance
arrow_drop_down
  • Open Access Croatian
    Authors: 
    M. Majić Renjo; L. Ćurković;
    Publisher: Croatian Society of Chemical Engineers
    Country: Croatia
  • Open Access Croatian
    Publisher: Croatian Society of Chemical Engineers
    Country: Croatia
  • Publication . Other literature type . 2017
    Open Access Croatian
    Authors: 
    Marija Kaštelan Macan;
    Publisher: Croatian Society of Chemical Engineers
    Country: Croatia
  • Open Access Croatian
    Authors: 
    Leo Frkanec;
    Publisher: Croatian Society of Chemical Engineers
    Country: Croatia
  • Open Access English
    Authors: 
    Barišić, L.; Rapić, V.;
    Publisher: Croatian Society of Chemical Engineers

    This article is the second part of a series dealing with organometallic and bioorganometallic chemistry. In the first part of this series a short review on the history and development of these disciplines was given, emphasizing the importance and scope of bioorganometallic chemistry as a new field dealing with conjugates of organometallics and biomolecules (DNA, PNA, amino acids, peptides...). From the variety of biorganometallics, syntheses and properties of simple conjugates of ferrocene with natural amino acids/peptides were elaborated inter alia. This material is the basis for the second part in which ferrocene amino acids are described. The introduction presents nonproteinogenic alicyclic and aromatic amino acids as the models for the title compounds. Naturally occurring amino acids labelled with ferrocene moiety mostly retain properties of the biomolecules included. Contrary to these ω-ferrocenylamino acids, one could imagine specific amino acids with inserted ferrocene core belonging to either homo- or heterodisubstituted type. The central part of this article is devoted to our investigations of the second type - H2N-(CH2)m-Fn-(CH2)n-COOH. The general rational procedure for synthesis of these compounds and of their N- and/or C-protected derivatives via the azide intermediates N3-CO-(CH2)m- Fn-(CH2)n-COOMe has been described. In the solid state derivatives of ferrocene amino acids contain intermolecular hydrogen bonds giving dimeric structures, three-dimensional networks or endless helical chains. The solutions of homologues Ac-NH-(CH2)m-Fn-(CH2)n-COOMe in nonpolar solvents are dominated by open form conformers. Compounds containing 2–3 ferrocene cores connected by amide, imide and oxalamide spacers were prepared by oligomerization of 1'-aminoferrocene-1-carboxylic acid (Fca) or by its condensation with the appropriate reagents. Similar to natural amino acids, ferrocene amino acids are water-soluble substances with high melting points, insoluble in organic solvents.

  • Publication . Article . 2019
    Open Access English
    Authors: 
    Nenad Raos;
    Publisher: Croatian Society of Chemical Engineers

    Rad se bavi razvojem pojma elementa od antičkih vremena (Empedoklo, Aristotel) preko razdoblja alkemije i rane kemije (Paracelsus, Petar Bono, Boyle) te početaka moderne kemije (Lavoisier, Mendeljejev) do suvremenih shvaćanja utemeljenih na atomskoj teoriji. Pokazuje se da pojam elementa ima dva značenja, elementarne (jednostavne) tvari i elementa u užem smislu; dok se prvi pojam razvijao prateći napredak metoda kemijske analize, za razumijevanje drugog pojma, pojma elementa, bilo je nužno steći dublji uvid u narav kemijskih promjena.

  • Open Access Croatian
    Authors: 
    Nenad Raos;
    Publisher: Croatian Society of Chemical Engineers
    Country: Croatia
  • Open Access Croatian
    Authors: 
    Ana Rubić;
    Publisher: Croatian Society of Chemical Engineers
    Country: Croatia
  • Publication . Other literature type . 2019
    Open Access Croatian
    Authors: 
    Nenad Raos;
    Publisher: Croatian Society of Chemical Engineers
    Country: Croatia
  • Publication . Other literature type . 2017
    Open Access Croatian
    Authors: 
    Nenad Raos;
    Publisher: Croatian Society of Chemical Engineers
    Country: Croatia
Send a message
How can we help?
We usually respond in a few hours.