title: Synthesis, thermal behavior, and dehydrogenation kinetics study of lithiated ethylenediamine.
abstract: The lithiation of ethylenediamine by LiH is a stepwise process to form the partially lithiated intermediates LiN(H)CH2 CH2 NH2 and [LiN(H)CH2 CH2 NH2 ][LiN(H)CH2 CH2 N(H)Li]2 prior to the formation of dilithiated ethylenediamine LiN(H)CH2 CH2 N(H)Li. A reversible phase transformation between the partial and dilithiated species was observed. One dimensional {Lin Nn } ladders and three-dimensional network structures were found in the crystal structures of LiN(H)CH2 CH2 NH2 and LiN(H)CH2 CH2 N(H)Li, respectively. LiN(H)CH2 CH2 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.
authors.affiliation: Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023 (P.R. China), Fax: (+86) 411-84379583; University of Chinese Academy of Science, Beijing, 100049 (P.R. China).
authors.forename: Juner
authors.initials: J
authors.lastname: Chen
authors.forename: Guotao
authors.initials: G
authors.lastname: Wu
authors.forename: Zhitao
authors.initials: Z
authors.lastname: Xiong
authors.forename: Hui
authors.initials: H
authors.lastname: Wu
authors.forename: Yong Shen
authors.initials: YS
authors.lastname: Chua
authors.forename: Wei
authors.initials: W
authors.lastname: Zhou
authors.forename: Bin
authors.initials: B
authors.lastname: Liu
authors.forename: Xiaohua
authors.initials: X
authors.lastname: Ju
authors.forename: Ping
authors.initials: P
authors.lastname: Chen
keywords: amines; crystallization; dehydrogenation; ladder polymers; lithiation