{Stable|Steady} open- and closed-shell Pd(II) and Cu(II) complexes of hexaethyl tripyrrin-1,14-dione (TD1) {produce|create|generate|make} triplet, doublet or singlet states {depending|based} {on the|around the} metal center {and the|and also the|as well as the|along with the|plus the} redox state {of the|from the|in the|on the|with the|of your} ligand. Pd(II) and Cu(II) {form|type|kind} neutral TD1 complexes featuring ligand-based radicals, {thus|therefore|hence|as a result} resulting in doublet and triplet states, respectively. The reversible one-electron oxidation {of the|from the|in the|on the|with the|of your} complexes removes an unpaired electron {from the|in the} ligand, {generating|producing|creating} singlet and doublet states. The optical properties and time-resolved dynamics {of these|of those} systems are studied {here|right here} {using|utilizing|making use of|employing|working with|applying} steady-state and ultrafast transient absorption (pump-probe) measurements. {Fast|Quick|Quickly|Rapidly|Rapid|Speedy} relaxation with recovery {of the|from the|in the|on the|with the|of your} ground state in 10s of picoseconds is observed for the copper neutral radical and oxidized complexes {as well as|in addition to|along with|and also|together with|and} for the palladium neutral radical {complex|complicated}. {Significantly|Considerably|Substantially|Drastically} longer timescales are observed for the oxidized palladium {complex|complicated}. The {ability to|capability to} tune the {overall|general|all round} spin state {of the|from the|in the|on the|with the|of your} complexes {through|via|by means of|by way of} their {stable|steady} open shell configurations {as well as|in addition to|along with|and also|together with|and} the reversible redox activity {of the|from the|in the|on the|with the|of your} tripyrrolic systems {makes|tends to make} them {particularly|especially|specifically} {interesting|fascinating|intriguing|exciting} for catalytic applications {as well as|in addition to|along with|and also|together with|and} exploring magnetism and conductivity properties. Ethyl 4-amino-1H-pyrrole-2-carboxylate Chemscene 942920-50-5 Order PMID:24463635
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