Photoactive energetic materials
Energetic materials that are photoactive or believed to be photoactive may include a conventional explosive (e.g. PETN, nitroglycerine) derivatized with an energetic UV-absorbing and/or VIS-absorbing chromophore such as 1,2,4,5-tetrazine or 1,3,5-triazine. Absorption of laser light having a suitably chosen wavelength may result in photodissociation, decomposition, and explosive release of energy. These materials may be used as ligands to form complexes. Coordination compounds include such complexes with counterions. Some having the formula M(L) n 2+ were synthesized, wherein M is a transition metal and L is a ligand and n is 2 or 3. These may be photoactive upon exposure to a laser light beam having an appropriate wavelength of UV light, near-IR and/or visible light. Photoactive materials also include coordination compounds bearing non-energetic ligands; in this case, the counterion may be an oxidant such as perchlorate.
1. A compound of the formula
wherein X is selected from —OCH(ONO 2 ) 2 or
or of the formula
wherein X is selected from —OCH 2 C(CH 2 ONO 2 ) 3 , —OCH 2 C((F)(NO 2 ) 2 ), —OCH(ONO 2 ) 2 ,
and wherein M is
2. A coordination compound comprising:
a cationic complex comprising a transition metal center and one or more ligands coordinated to the transition metal center, wherein the one or more ligands comprise a 1,2,4,5-tetrazine ring and one or more explosive pendant groups covalently bonded to the 1,2,4,5-tetrazine ring or a 1,3,5-triazine ring and one or more explosive pendant groups covalently bonded to the 1,3,5-triazine ring;
and
a counterion,
wherein the one or more ligands have the formula:
wherein X is selected from
OCH 2 C(CH 2 ONO 2 ) 3 , OH, or NH 2 ; and
wherein Y is selected from
or have the formula:
wherein X is selected from —OCH 2 C(CH 2 ONO 2 ) 3 , —OCH 2 C((F)(NO 2 ) 2 ), —OCH(ONO 2 ) 2 ,
or have the formula:
wherein X is selected from —OCH 2 C(CH 2 ONO 2 ) 3 , —OCH 2 C((F)(NO 2 ) 2 ), —OCH(ONO 2 ) 2 ,
and
wherein M is
3. The coordination compound of claim 2 , wherein the transition metal center comprises Fe, Cu, Ni, or Co.
4. The coordination compound of claim 2 ,
wherein the transition metal is Fe,
wherein the cationic complex comprises the formula Fe(II)(L) 3 2+ , wherein L is a ligand selected from
5. The coordination compound of claim 2 ,
wherein the transition metal is selected from Cu, Co, and Ni,
wherein the transition metal is bonded to two ligands each of which ligands has the formula
6. The coordination compound of claim 2 , wherein the counterion is selected from tetrafluoroborate (BF 4 −1 ), nitrate (NO 3 −1 ), perchlorate (ClO 4 −1 ), sulfate (SO 4 −2 ), phosphate (PO 4 3− ), and carbonate (CO 3 2− ).