Effects of Acidity on Nitrogen-Heterocyclic Compounds with Rare Earth Coordination and the Structure of Protonated Phenanthroline

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·H₂O. 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 = 90.00º, β = 96.69(3) º, γ = 90.00 º, V = 1071.65(379) ų, Z = 4.

• Periodical: Advanced Materials Research (Volumes 233-235)
• Pages: 2808-2811
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.233-235.2808
• Online since: May 2011
• Authors: Huan Huan Li, Hai Bin Chu, Ying Nan Chen, Xiao Tao Fu, Hui Juan Sun, Yuan Li, Yong Liang Zhao
• Keywords: Acidity, Effect, Nitrogen-Heterocyclic, Structure

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