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  • Küçük Resim
    Öğe
    Organic biomolecules bind to phosphate through borate linkages in aqueous solutions
    (TÜBİTAK, 2014) Aydoğmuş, Nazik; Köse, Dursun Ali; Beckett, Micheal Andrew; Zümreoğlu Karan, Birgül
    Solutions of salicyclic, ascorbic, and citric acids were reacted with boric acid, followed by NaH2PO4. The products, triphosphateborate ester of salicylic acid (1), orthosphateborate ester of ascorbic acid (2), triphosphateborate ester of ascorbic acid (3), and orthosphateborate ester of citric acid (4), were ash precipitated with cold acetone and characterised by microanalysis, thermal analysis, FT-IR, Raman, 11B NMR, 31P MAS NMR, and mass spectroscopic techniques. Analytical results indicated the presence of-C-O-B-O-P-linkages with the attached phosphate groups varying between orthophosphate and triphosphate, depending on the starting material. The biomolecules studied in this work may serve as models in the B-P-organic system and the results would provide a possible contribution to boronprebiotic chemistry.© TÜBİTAK.
  • [ X ]
    Öğe
    Structural and thermal studies of non-metal cation pentaborate salts with cations derived from 1,5-diazobicyclo[4.3.0]non-5-ene, 1,8-diazobicyclo[5.4.0] undec-7-ene and 1,8-bis(dimethylamino)naphthalene
    (Elsevier B.V., 2012) Beckett, Micheal Andrew; Horton, Peter Neil; Coles, Simon J.; Köse, Dursun Ali; Kreuziger, Anna Marlena
    The reaction of the cyclic amines 1,5-diazobicyclo[4.3.0]non-5-ene (DBN), 1,8-diazobicyclo[5.4.0]undec-7-ene (DBU) and 1,8-bis(dimethylamino)naphthalene (PS) with B(OH)3 in a 1:5 ratio affords in high yields the non-metal cation pentaborate salts [HDBN][B5O6(OH)4] (1), [HDBU][B5O6(OH)4] (2) and [HPS][B5O6(OH)4]·B(OH)3 (3). Compounds 1–3 were characterized by spectroscopic studies (NMR, IR) and compounds 1 and 3 were further characterized by single-crystal XRD studies. The pentaborate salts compounds show extensively H-bonded supramolecular anionic lattices which are templated by the cations. Thermal analysis (TGA) of 1–3 showed that thermally decomposed in air at 1000° to B2O3 in a two step process involving dehydration (<250 °C) and oxidation (250–600 °C). BET analysis of materials derived from thermolysis of 1–3 had internal porosities of <1 m2/g.
  • Küçük Resim
    Öğe
    Synthesis, spectroscopic and thermal characterization of non-metal cation (nmc) pentaborates salts containing cations derived from histidine and arginine
    (Hacettepe University, 2012) Köse, Dursun Ali; Beckett, Micheal Andrew; Çolak, Naki
    The new non-metal cation (NMC) pentaborate structures of cationic histidine and arginine aminoacids were synthesized and characterized using spectroscopic (11B NMR and IR) methods. Their thermal properties have been investigated by TG/DrTG-DTA. The histidine NMC pentaborate, [C6H10N3O2][B5O6(OH)4].4H2O and the arginine pentaborate, [C6H13N4O2][B5O6(OH)4]2.3H2O are formulated with 4 and 3 waters of crystallization, respectively. The histidine pentaborate is more stable than the arginine pentaborate to thermal decomposition, but both decompose thermally via initial dehydration followed by loss of amino acid fragments to afford glassy B2O3.