Charge-transfer transitions general considerations

Both states are thought to arise from an intraligand charge-transfer (TLCT) transition with considerable 1,2-enedithiolate n to heterocycle n character (17-19, 22, 31). This transition is generally in the 400-500 nm (25,000-20,000 cm-1) range and is the lowest lying band in the emissive heterocyclic-substituted platinum 1,2-enedithiolates. 

Primary explosives are substances which unlike secondary explosives show a very rapid transition from combustion (or deflagration) to detonation and are considerably more sensitive towards heat, impact or friction than secondary explosives. Primary explosives generate either a large amount of heat or a shockwave which makes the transfer of the detonation to a less sensitive secondary explosive possible. They are therefore used as initiators for secondary booster charges (e.g. in detonators), main charges or propellants. Although primary explosives (e.g. Pb(N3)2) are considerably more sensitive than secondary explosives (e.g. RDX), their detonation velocities, detonation pressures and heat of explosions are as a rule, generally lower than those of secondary explosives (Tab. 2.1). 

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