The Effect of Structural Modifications on Charge Migration in Mesomorphic Phthalocyanines

Multiple-decker phthalocyaninato Tb(III) single-molecule magnets and Y(III) complexes for next generation devices

“…16. The crystal structure of 3 is similar to those of the previously described LnPc 2 derivatives with thioalkylated, alkoxy, and alkyl chains [30][31][32][33][34][35][36][37][38]. In addition, the metal center of 3 has a distorted anti-prismatic coordination environment with a Pc stacking angle of 45 • (TbPc 2 : 41 • ) [133].…”

“…LnPc 2 , therefore, has two spin systems: an unpaired electron on one of the Pc ligands and a Ln 3+ ion with 4f electrons. MPc 2 with various substituents have been synthesized [30][31][32][33][34][35][36][37][38]. At the same time, the Pc ligand can form triple-decker complexes composed of three Pc 2− ligands and two Ln 3+ ions (Ln 2 Pc 3 ) [39][40][41][42], resulting in a neutral complex with a closed shell electron system [43,44].…”

The Mobility and Decay Kinetics of Charge Carriers in Discotic Hexabenzocoronenes

“…The PR-TRMC technique has been extensively described in previous publications [2,7,39]. Briefly, the material of interest is ionized by a single nanosecond pulse of 3 MeV electrons from a Van de Graaff accelerator.…”

“…The value of E p was taken to be 25 eV, and the values of W p , which were within the range 0.39 to 0.47, were calculated following the model described previously. [2,7,39] The factor three in Equation 1 takes into account the fact that organized columnar domains within the bulk samples investigated are randomly orientated and that charge transport is expected to occur almost exclusively along the axis of the columnar stacks. The mobility sum, Rl= l(+) + l(±), is used in Equation 1 since the PR-TRMC technique does not allow the determination of the separate contributions of the positive and negative charge carriers.…”

“…The transition temperatures are however seen to be sensitive to these factors with the K®Col transitions for the branchedchain compounds occurring 20±30 C lower than for HBC-C10, in agreement with the, in general, lower melting points of branched-chain alkane isomers. [2,23] Subtle differences can also be discerned between the chiral and regio-random C8,2 derivatives. For the former, a gradual decrease in mobility occurs prior to the abrupt decrease, indicating a process of partial melting to occur prior to the full phase transition.…”