Abstract
Interplanar interactions were analysed for metal bridged phthalocyanine dimers, [NBu4] [M(III)Pc2] (M = Y, Yb and Lu), by using zero field splitting (ZFS) parameters in the T1 states. The observed ZFS D and a triplet lifetime decreased remarkably due to dimerization. From a comparison of D between the monomer and the dimer the interplanar interactions are divided into two types: exciton and charge resonance. It is found that nearly 50% of the charge resonance contribution (b 2) is involved in the T1 state of LuPc- 2. The correlations between b 2, the triplet lifetime and the ionic radius of the central metal are discussed in terms of the charge resonance interaction.
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