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Synthesis, Thermal Behavior, and Dehydrogenation Kinetics Study of Lithiated Ethylenediamine
Author(s) -
Chen Juner,
Wu Guotao,
Xiong Zhitao,
Wu Hui,
Chua Yong Shen,
Zhou Wei,
Liu Bin,
Ju Xiaohua,
Chen Ping
Publication year - 2014
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201403047
Subject(s) - dehydrogenation , ethylenediamine , chemistry , medicinal chemistry , ammonia , kinetics , inorganic chemistry , catalysis , organic chemistry , physics , quantum mechanics
The lithiation of ethylenediamine by LiH is a stepwise process to form the partially lithiated intermediates LiN(H)CH 2 CH 2 NH 2 and [LiN(H)CH 2 CH 2 NH 2 ][LiN(H)CH 2 CH 2 N(H)Li] 2 prior to the formation of dilithiated ethylenediamine LiN(H)CH 2 CH 2 N(H)Li. A reversible phase transformation between the partial and dilithiated species was observed. One dimensional {Li n N n } ladders and three‐dimensional network structures were found in the crystal structures of LiN(H)CH 2 CH 2 NH 2 and LiN(H)CH 2 CH 2 N(H)Li, respectively. LiN(H)CH 2 CH 2 N(H)Li undergoes dehydrogenation with an activation energy of 181±8 kJ mol −1 , whereas the partially lithiated ethylenediamine compounds were polymerized and released ammonia at elevated temperatures. The dynamical dehydrogenation mechanism of the dilithiated ethylenediamine compounds was investigated by using the Johnson‐Mehl‐Avrami equation.