Heteroleptic zinc dipyrromethene complexes
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H-1 NMR spectroscopy has been used to study the complexation of a per-alkyl dipyrromethene with zinc acetate. An intermediate, assigned to be the heteroleptic Zn(dipyrromethene) (acetate) complex, is observed under titration conditions although only zinc(dipyrromethene)(2) is obtained after simple work-up. This indicates that disproportionation occurs during work-up and that dipyrromethene complexation does not occur under self-assembled control.
Amiri, A., IM Comeau, and A. Thompson. 2006. "Heteroleptic zinc dipyrromethene complexes." Journal of Heterocyclic Chemistry 43(2): 431-435.