Ultraviolet photoelectron spectroscopy study of the thermochromic phase transition in urethane-substituted polydiacetylenes

2007 ◽  
Vol 126 (18) ◽  
pp. 184905 ◽  
Author(s):  
Xiaoyu Wang ◽  
James E. Whitten ◽  
Daniel J. Sandman
Keyword(s):  
Phase Transition ◽  
Photoelectron Spectroscopy ◽  
Ultraviolet Photoelectron Spectroscopy ◽  
Spectroscopy Study

Thermolysis of N-alkylated ethylenediamines: an ultraviolet photoelectron spectroscopy study

1986 ◽  
Vol 64 (11) ◽  
pp. 2175-2183 ◽  
Author(s):  
N. H. Werstiuk
Keyword(s):  
Molecular Orbital ◽  
Photoelectron Spectroscopy ◽  
The Other ◽  
Ultraviolet Photoelectron Spectroscopy ◽  
Spectroscopy Study ◽  
Efficient Route

Thermolyses of N,N,N′,N′-tetramethylethylenediamine (1a), N,N,N′,N′-tetraethylethylenediamine (1b) and sym-N,N′-dimethylethylenediamine (1c) at 760–825 °C have been studied by ultraviolet photoelectron spectroscopy. Although the corresponding N-alkylated aminomethylene radicals were not observed, this study establishes that thermolysis of 1a is an efficient route to N-methylenimine (3a); methane, ethane, and ethene are the other major products. Diamine 1b yields, besides ethane, ethene, and propane, heretofore unreported N-ethylmethylenimine (3b). Diamine 1c yields imine 3a and methylenimine (3c), as well as hydrogen, methane, ethane, and ethene. Molecular orbital eigenvalues of the imines are calculated using HAM/3, MNDO, HF/STO-3G, HF/3-21G, and HF/6-31G* methods.

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