Communications, Series B: Chemistry and Chemical Engineering

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Browsing Communications, Series B: Chemistry and Chemical Engineering by Subject "Cyclotetraphosphazene"

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    Desıgnatıon Of Absolute Confıguratıon Of Multıhetereocyclıc 9,13-Dıchloro-22,22-Dıpyrrolıdıne-1-Yl1h,2h,13h,19h-9,13-(Epıazenophosphazeno)-9λ5,11λ5,13λ5-[1,3,5,2,4] Benzoxadıazadiphosphonıno[4',5':2,3][1,3,2]Dıazaphospholo[2,1-D] [1,3,5,2,4]Benzoxadıazadıphosphonıne By X-Ray Crystallographıc Data
    (Ankara Üniversitesi Fen Fakültesi, 2019-12-31) Elmas, Gamze; Okumuş, Aytuğ; İsaoğlu, Satiye Sevim; Hökelek, Tuncer; Kılıç, Zeynel; Kimya; Fen Fakültesi
    The title compound, 9,13-dichloro-22,22-dipyrrolidine-1-yl-1H,2H,13H,19H-9,13-(epiazenophosphazeno)-9λ5,11λ5,13λ5-1,3,5,2,4]benzoxadiazadiphosphonino [4',5':2,3][1,3,2]diazaphospholo[2,1-d][1,3,5,2,4]benzoxadiazadiphosphonine; 2(C24H32Cl2N8O2P4). 0.5 C6H12, a cyclotetraphosphazene derivative, has a geminaldipyrrolidino-2-trans-6-dichloro-ansa-spiro-ansa (gem-dipyrrolidino-2-trans-6-dichloroasa) structure in which the tricyclic parts are consisted of three eight-membered rings, containing a tetrameric N4P4 and two ansa rings. However, all these rings are not planar. The asymmetric unit contains two crystallographically independent molecules and one half of the cyclohexane solvent molecule. In both molecules, it is expected that two P (P1 and P3/P1′ and P3′) atoms are stereogenic centres. Both gem-dipyrrolidino-2-trans-6-dichloro-asa molecules have trans structures according to the Cl atoms, and they are in the racemic forms. Besides, it is found that the absolute configurations of P1, P3 and P1′, P3′ phosphorus centers are RR and SS, respectively. The title compound has P-1 space group, a Sohncke chiral space group, with the cell parameters of a = 9.6682(2), b = 13.8587(3), c = 24.0250(4) Å, � =105.249(2)°, � = 96.298(3)° and � = 98.367(3)°.
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    Determınatıon Of Absolute Confıguratıon Of 8,8,10,10tetrachloro-20,21-Dıhydro-18h,23h-6,12-Epıazeno-6λ5,8λ5,10λ5, 12λ5[1,3,2]Benzoxazaphosphonıno[2',3':8,9][1,3,5,7,9,2,4,6,8] Pentaazatetraphosphacycloundsyno[2,1-B][1,3,2] Benzoxazaphosphonıne Usıng X-Ray Crystallography
    (Ankara Üniversitesi Fen Fakültesi, 2019-12-31) Elmas, Gamze; Okumuş, Aytuğ; İsaoğlu, Satiye Sevim; Hökelek, Tuncer; Kılıç, Zeynel; Kimya; Fen Fakültesi
    The title compound, 8, 8, 10, 10-tetrachloro-20,21-dihydro-18H, 23H-6, 12epiazeno-6λ5, 8λ5, 10λ5, 12λ5-[1,3,2] benzoxazaphosphonino [2',3':8,9][1,3,5,7,9,2,4,6,8] pentaazatetraphosphacyclo undsyno [2,1-b] [1,3,2] benzoxazaphosphonine; C16H16Cl4N6O2P4, a cyclotetraphosphazene, has a tetrachloro-2, 4-spiro-ansa-spiro (tetrachloro-2,4-sas) architecture in which the bicyclic structure has consisted of eightmembered tetrameric N4P4 and seven-membered ansa (N1/P1/P1′/N4′/C8′/C8/N4) rings fused with a common PNP fragment. The asymmetric unit possesses one-half of the molecule. P1 and P1′ atoms are stereogenic centres. In addition, there is a mirror plane passing through the N3 and N1 atoms in the molecule, and therefore, this compound is in meso form (RS/SR). According to the checkcif result, it is found that the absolute configuration of P1 and/or P1′ phosphorus centers is RS, displaying that in the solid-state there is only one enantiomer in the unit cell. The space group is P bnm with cell parameters of a = 6.2692(2), b = 15.8111(3), c = 22.9393(4) Å.