Updating Critical Discourse Analysis in Education

Abstract

2,3-bis(2-pyridyl)-5,6-dihydropyrazine and a protonated phenanthroline (Phen) have been synthesized and the structure of protonated Phen is established by X-ray diffraction single crystal structure analysis. The coordination reactions of Phen, 2,2'- bipyridine and 2,3-bis(2-pyridyl)-5,6-dihydropyrazine with rare earth ions in low pH have been studied. The results show that 2,3-bis(2-pyridyl)-5,6-dihydropyrazine is hydrolyzed to be 2,2'-pyridil and protonated ethylenediamine. Meanwhile, Phen combines with proton, which results that nitrogen atoms can not coordinate with rare earth ions. The molecular formula of protonated Phen is C12H8N2HCl H 2O. It crystallizes in the triclinic space group P -1 (2), with a = 7.1212(14) Å,b = 7.2786(15) Å, c = 20.817(4) Å, α = 90.00°, β = 96.69(3) °, γ = 90.00 °, V = 1071.65(379) Å3, Z = 4. © (2011) Trans Tech Publications, Switzerland.