Laser Initiation of Fe(II) Complexes of 4-Nitro-pyrazolyl Substituted Tetrazine Ligands.
The synthesis and characterization of new 1,2,4-triazolyl and 4-nitro-pyrazolyl substituted tetrazine ligands has been achieved. The strongly electron deficient 1,2,4-triazolyl substituted ligands did not coordinate Fe(II) metal centers, while the mildly electron deficient 4-nitro-pyrazolyl substituted ligands did coordinate Fe(II) metal centers in a 2:1 ratio of ligand to metal. The thermal stability and mechanical sensitivity characteristics of the complexes are similar to the conventional explosive pentaerythritol tetranitrate. The complexes had strong absorption in the visible region of the spectrum that extended into the near-infrared. In spite of having improved oxygen balances, increased mechanical sensitivity, and similar absorption of NIR light to recently reported Fe(II) tetrazine complexes, these newly synthesized explosives were more difficult to initiate with Nd:YAG pulsed laser light. Specifically, the complexes required lower densities (0.9 g/cm3) to initiate at the same threshold utilized to initiate previous materials at higher densities (1.05 g/cm3).
M Division and ‡Chemistry Division, Los Alamos National Laboratory , P.O. Box 1663, Los Alamos, New Mexico 87544, United States.
Thomas W
http://orcid.org/0000-0003-3748-0848
TW
Myers
M Division and ‡Chemistry Division, Los Alamos National Laboratory , P.O. Box 1663, Los Alamos, New Mexico 87544, United States.
Kathryn E
KE
Brown
M Division and ‡Chemistry Division, Los Alamos National Laboratory , P.O. Box 1663, Los Alamos, New Mexico 87544, United States.
David E
DE
Chavez
M Division and ‡Chemistry Division, Los Alamos National Laboratory , P.O. Box 1663, Los Alamos, New Mexico 87544, United States.
R Jason
RJ
Scharff
M Division and ‡Chemistry Division, Los Alamos National Laboratory , P.O. Box 1663, Los Alamos, New Mexico 87544, United States.
Jacqueline M
JM
Veauthier